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Income Taxes (Components of Income Tax Expense) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Consolidated statements of operations:      
Current income taxes $ 133,036 $ 80,527 $ 127,535
Deferred income taxes (benefits) 3,013 (52,336) (80,869)
Total income tax expense included in consolidated statements of operations 136,049 28,191 46,666
Stockholders' equity:      
Expense (benefit) relating to: change in net unrealized investment losses (344,944) 123,620 202,143
Expense (benefit) relating to: share-based compensation (4,043) (392) (1,061)
Expense (benefit) relating to: extinguishment of convertible debt (4,546) 0 0
Total income tax expense included in consolidated financial statements $ (217,484) $ 151,419 $ 247,748