Annual report pursuant to Section 13 and 15(d)

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

v2.4.1.9
Stockholders' Equity Schedule of Accumulated Other Comprehensive Income (Loss) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Accumulated Gross Unrealized Loss $ (36,031)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax $ (253,044)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Available-for-sale Securities, Accumulated Gross Unrealized Gain 891,820us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax 697,779us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Accumulated other comprehensive income $ 855,789us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ 444,735us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax