Annual report pursuant to Section 13 and 15(d)

Basis of Presentation and Significant Accounting Policies Offsetting Assets and Liabilities (Details)

v3.8.0.1
Basis of Presentation and Significant Accounting Policies Offsetting Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Offsetting [Abstract]    
Gross amount of recognized derivative assets $ 340,576 $ 388,522
Gross amount of derivative liabilities offset against derivative assets in the balance sheet (30,658) (64,340)
Net amount of derivative assets presented in the balance sheet 309,918 324,182
Gross amount of derivative liabilities not offset against derivative assets in the balance sheet (31,903) (12,501)
Gross amount of cash collateral received not offset against derivative assets in the balance sheet 0 0
Net amount of derivative assets after effects of amounts offset and not offset in the balance sheet 278,015 311,681
Gross amount of recognized assets subject to master netting arrangements or similar agreements 340,576 388,522
Gross amount of liabilities offset against assets subject to master netting arrangements or similar agreements in the balance sheet (30,658) (64,340)
Net amount of assets subject to master netting arrangements or similar agreements presented in the balance sheet 309,918 324,182
Gross amount of liabilities not offset against assets subject to master netting arrangements or similar agreements in the balance sheet (31,903) (12,501)
Gross amount of cash collateral received not offset against assets subject to master netting arrangements or similar agreements in the balance sheet 0 0
Net amount of assets subject to master netting arrangements or similar agreements after effects of amounts offset and not offset in the balance sheet 278,015 311,681
Gross amount of recognized repurchase agreements (19,451,207) (8,865,184)
Gross amount of financial assets offset against repurchase agreements in the balance sheet 0 0
Net amount of repurchase agreements presented in the balance sheet (19,451,207) (8,865,184)
Gross amount of financial assets not offset against repurchase agreements in the balance sheet 19,451,207 8,865,184
Gross amount of cash collateral pledged not offset against repurchase agreements in the balance sheet 0 0
Net amount of repurchase agreements after effects of amounts offset and not offset in the balance sheet 0 0
Gross amount of recognized derivative liabilities (62,561) (76,841)
Gross amount of derivative assets offset against derivative liabilities in the balance sheet 30,658 64,340
Net amount of derivative liabilities presented in the balance sheet (31,903) (12,501)
Gross amount of derivatives assets not offset against derivative liabilities in the balance sheet 31,903 12,501
Gross amount of cash collateral pledged not offset against derivative liabilities in the balance sheet 0 0
Net amount of derivative liabilities after effects of amounts offset and not offset in the balance sheet 0 0
Gross amount of recognized liabilities subject to master netting arrangements or similar agreements (19,513,768) (8,942,025)
Gross amount of assets offset against liabilities subject to master netting arrangements or similar agreements in the balance sheet 30,658 64,340
Net amount of liabilities subject to master netting arrangements or similar agreements presented in the balance sheet (19,483,110) (8,877,685)
Gross amount of assets not offset against liabilities subject to master netting arrangements or similar agreements in the balance sheet 19,483,110 8,877,685
Gross amount of cash collateral pledged not offset against liabilities subject to master netting arrangements or similar agreements in the balance sheet 0 0
Net amount of liabilities subject to master netting arrangements or similar agreements after effects of amounts offset and not offset in the balance sheet $ 0 $ 0