Annual report pursuant to Section 13 and 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
Dec. 31, 2012
Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Gross Unrealized Gains $ 724,696 $ 120,745
Available-for-sale Securities, Gross Unrealized Losses (28,238) (179,461)
Available-for-sale Securities, Gross Unrealized Gain (Loss) $ 696,458 $ (58,716)