Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Investments, Owned, Federal Income Tax Note [Line Items]
Current	$ 10,042	$ 22,551	$ 38,137	$ 53,596
Deferred	(13,721)	17,629	10,081	36,938
Total income tax provision	(3,679)	40,180	$ 48,218	$ 90,534
Reconciliation between the statutory federal income tax rate and the effective income tax rate from continuing operations
Statutory federal income tax rate			35.00%	35.00%
Investment income not subject to federal tax			(2.70%)	(1.90%)
Tax credits			(0.40%)	(0.20%)
State income taxes, net of federal benefit			1.90%	1.40%
Other, net			0.70%	0.50%
Effective income tax rate			34.50%	34.80%
Reconciliation of unrecognized tax benefits
Amount of unrecognized tax benefits if recognized, would impact the annual effective tax rate	4,927	$ 4,372	$ 4,927	$ 4,372
Minimum
Reconciliation of unrecognized tax benefits
Additional increase to unrecognized tax benefits	4,000		4,000
Maximum
Reconciliation of unrecognized tax benefits
Additional increase to unrecognized tax benefits	$ 5,000		$ 5,000