Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity Schedule of Accumulated Other Comprehensive Income (Loss) (Details)

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Stockholders' Equity Schedule of Accumulated Other Comprehensive Income (Loss) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Gross Unrealized Gains $ 730,503 $ 120,745
Available-for-sale Securities, Gross Unrealized Losses (30,107) (179,461)
Available-for-sale Securities, Gross Unrealized Gain (Loss) $ 700,396 $ (58,716)