Income Tax (Details 4) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Deferred Tax Assets, Net [Abstract]
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals	$ 77,116,000	$ 51,101,000
Deferred Tax Assets Reinsurance Transactions	17,054,000	17,097,000
Deferred Tax Assets Cash And Invested Assets	0	0
Deferred Tax Assets Investment Income	109,275,000	98,496,000
Deferred Tax Assets Deferred Acquisition Costs Capitalized For Tax	91,886,000	67,006,000
Deferred Tax Assets, Operating Loss Carryforwards	159,821,000	174,503,000
Deferred Tax Assets Capital Loss And Foreign Tax Credit Carryforwards	621,000	0
Deferred Tax Assets Deferred Acquisition Costs Capitalized For Financial Reporting	23,595,000	41,737,000
Deferred Tax Assets, Gross	479,368,000	449,940,000
Deferred Tax Assets, Valuation Allowance	10,100,000	8,630,000
Deferred Tax Assets, Net	469,268,000	441,310,000
Deferred Tax Liabilities [Abstract]
Deferred Tax Liabilities, Deferred Expense, Deferred Policy Acquisition Cost	1,082,394,000	1,047,748,000
Deferred Tax Liabilities Reinsurance Transactions	637,002,000	473,767,000
Deferred Tax Liabilities Cash And Invested Assets	832,940,000	574,738,000
Deferred Tax Liabilities Investment Income	12,719,000	13,499,000
Deferred Tax Liabilities, Unrealized Currency Transaction Gains	0	8,604,000
Deferred Tax Liabilities	2,565,055,000	2,118,356,000
Deferred Tax Assets (Liabilities), Net	(2,095,787,000)	(1,677,046,000)
Balance Sheet Presentation Of Deferred Tax Liabilities [Abstract]
Deferred Tax Assets, Other	24,714,000	2,788,000
Deferred income taxes	$ 2,120,501,000	$ 1,679,834,000