Insurance (Details 2) (USD $)	3 Months Ended		12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reconciliation of statutory net income to U.S. GAAP net income
Statutory net income			$ 28,624,000	$ 28,452,000	$ 44,830,000
Reserve changes			4,185,000	12,708,000	5,138,000
Change in deferred policy acquisition costs			3,216,000	3,600,000	(2,819,000)
Income tax charge			(3,121,000)	(1,311,000)	(5,092,000)
Amortization of interest maintenance reserve			2,208,000	2,517,000	2,906,000
Realized gains (losses)			(689,000)	1,802,000	(4,038,000)
Other, net			313,000	145,000	(390,000)
U.S. GAAP net income			34,736,000	47,913,000	40,535,000
Reconciliation of statutory equity to U.S. GAAP equity
Statutory equity			508,861,000	622,746,000
Reserve changes			58,222,000	54,026,000
Decrease in carrying value of affiliates			(45,081,000)	(42,354,000)
Deferred policy acquisition costs			38,095,000	34,458,000
Net unrealized gains			35,005,000	25,407,000
Income tax benefit			(25,527,000)	(9,841,000)
Provision for reinsurance			5,149,000	7,674,000
Asset valuation reserve			3,934,000	2,474,000
Other, net			8,128,000	1,887,000
U.S. GAAP equity			586,786,000	696,477,000
Receivable for securities due from broker, non-admitted for statutory accounting included in other, net			5,700,000
Dividends paid	$ 150,000,000	$ 45,000,000