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Fair Value of Financial Instruments (Fair Value Measurements for Level 3 Instruments) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Beginning balance $ 114,287 $ 169,314
Total realized and unrealized gains (losses):    
Included in net income (61,750) 68,616
Included in other comprehensive income (loss) 0 0
Purchases 86,189 73,937
Sales 0 0
Issuances 0 0
Settlements (100,317) (197,580)
Transfers into (out of) Level 3 0 0
Balance at end of period 38,409 114,287
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: (47,780) 40,350
Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Beginning balance 142,492 193,338
Total realized and unrealized gains (losses):    
Included in net income (61,676) 73,851
Included in comprehensive income (loss) 0 0
Purchases 86,189 73,937
Sales 0 0
Issuances 0 0
Settlements (100,977) (198,634)
Transfers into (out of) Level 3 0 0
Balance at end of period 66,028 142,492
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: (48,707) 44,722
Debt Securities, Available for Sale [Member]    
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Beginning balance 0 0
Total realized and unrealized gains (losses):    
Included in net income 0 0
Included in other comprehensive income (loss) 0 0
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements 0 0
Transfers into (out of) Level 3 0 0
Balance at end of period 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
Equity Securities, Available for Sale [Member]    
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Beginning balance 0 0
Total realized and unrealized gains (losses):    
Included in net income 0 0
Included in other comprehensive income (loss) 0 0
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements 0 0
Transfers into (out of) Level 3 0 0
Balance at end of period 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
Derivatives, Index Options [Member]    
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Beginning balance 114,287 169,314
Total realized and unrealized gains (losses):    
Included in net income (61,750) 68,616
Included in other comprehensive income (loss) 0 0
Purchases 86,189 73,937
Sales 0 0
Issuances 0 0
Settlements (100,317) (197,580)
Transfers into (out of) Level 3 0 0
Balance at end of period 38,409 114,287
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: (47,780) 40,350
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: (47,780) 40,350
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
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
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
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: (47,780) 40,350
Other Operating 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
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: (48,707) 44,722
Other Operating 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
Other Operating 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
Other Operating 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