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Fair Value of Financial Instruments (Fair Value Measurements for Level 3 Instruments) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Balance at beginning of period $ 95,987 $ 134,916 $ 114,287 $ 169,314
Total realized and unrealized gains (losses):        
Included in net income (8,782) 45,251 (17,069) 45,799
Included in other comprehensive income 0 0 0 0
Purchases 21,473 18,232 39,929  
Sales 0 0 0  
Issuances 0 0 0  
Settlements (36,151) (51,885) (64,620)  
Transfers into (out of) Level 3 0 0 0 0
Balance at end of period 72,527 146,514 72,527 146,514
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets held at the end of the reporting period: (11,922) 43,313 (17,830) 44,200
Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Balance at beginning of period 119,987 160,536 142,492 193,338
Total realized and unrealized gains (losses):        
Included in net income (9,653) 44,779 (22,036) $ 47,430
Included in other comprehensive income 0 0 0  
Purchases 21,473 18,232 39,929 $ 33,569
Sales 0 0 0 0
Issuances 0 0 0 0
Settlements 36,439 52,119 65,017 102,909
Transfers into (out of) Level 3 0 0 0 0
Balance at end of period 95,368 171,428 95,368 171,428
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets held at the end of the reporting period: (813) 1,006 (1,600) 3,091
Debt Securities, Available for Sale [Member]        
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Balance at beginning of period 0 0 0 0
Total realized and unrealized gains (losses):        
Included in net income 0 0 0 0
Included in other comprehensive income 0 0 0 0
Purchases 0 0 0 0
Sales 0 0 0 0
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers into (out of) Level 3 0 0 0 0
Balance at end of period 0 0 0 0
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets held at the end of the reporting period: 0 0 0 0
Equity Securities, Available for Sale [Member]        
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Balance at beginning of period 0 0 0 0
Total realized and unrealized gains (losses):        
Included in net income 0 0 0 0
Included in other comprehensive income 0 0 0 0
Purchases 0 0 0 0
Sales 0 0 0 0
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers into (out of) Level 3 0 0 0 0
Balance at end of period 0 0 0 0
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets held at the end of the reporting period: 0 0 0 0
Derivatives, Index Options [Member]        
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Balance at beginning of period 95,987 134,916 114,287 169,314
Total realized and unrealized gains (losses):        
Included in net income (8,782) 45,251 (17,069) 45,799
Included in other comprehensive income 0 0 0 0
Purchases 21,473 18,232 39,929 33,569
Sales 0 0 0 0
Issuances 0 0 0 0
Settlements (36,151) (51,885) (64,620) (102,168)
Transfers into (out of) Level 3 0 0 0 0
Balance at end of period 72,527 146,514 72,527 146,514
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets held at the end of the reporting period: (11,922) 43,313 (17,830) 44,200
Net Investment Income [Member]        
Total realized and unrealized gains (losses):        
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets held at the end of the reporting period: (11,922) 43,313 (17,830) 44,200
Total realized and unrealized gains (losses):        
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets held at the end of the reporting period: 0 0 0 0
Net Investment Income [Member] | Debt Securities, Available for Sale [Member]        
Total realized and unrealized gains (losses):        
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets held at the end of the reporting period: 0 0 0 0
Net Investment Income [Member] | Equity Securities, Available for Sale [Member]        
Total realized and unrealized gains (losses):        
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets held at the end of the reporting period: 0 0 0 0
Net Investment Income [Member] | Derivatives, Index Options [Member]        
Total realized and unrealized gains (losses):        
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets held at the end of the reporting period: (11,922) 43,313 (17,830) 44,200
Other Operating Income (Expense) [Member]        
Total realized and unrealized gains (losses):        
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets held at the end of the reporting period: 0 0 0 0
Total realized and unrealized gains (losses):        
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets held at the end of the reporting period: (813) 1,006 (1,600) 3,091
Other Operating Income (Expense) [Member] | Debt Securities, Available for Sale [Member]        
Total realized and unrealized gains (losses):        
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets held at the end of the reporting period: 0 0 0 0
Other Operating Income (Expense) [Member] | Equity Securities, Available for Sale [Member]        
Total realized and unrealized gains (losses):        
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets held at the end of the reporting period: 0 0 0 0
Other Operating Income (Expense) [Member] | Derivatives, Index Options [Member]        
Total realized and unrealized gains (losses):        
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets held at the end of the reporting period: $ 0 $ 0 $ 0 $ 0