Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Significant Accounting Policies New Accounting Pronouncements (Details)

v3.7.0.1
Basis of Presentation and Significant Accounting Policies New Accounting Pronouncements (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash $ 381,664 $ 408,312 $ 281,145 $ 262,562