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Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income before income taxes	$ 130,247	$ 337,314	$ 196,064
Income tax expense on income before income taxes	45,586	118,060	68,622
Tax effect of: state income taxes	2,559	2,924	1,145
Tax effect of: tax exempt net investment income	(2,167)	(3,834)	(3,669)
Tax effect of: extinguishment of convertible debt	0	0	4,202
Tax effect of: other	1,026	334	(259)
Total income tax expense included in consolidated statements of operations	$ 47,004	$ 117,484	$ 70,041
Effective tax rate	36.10%	34.80%	35.70%

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Effective income tax rate reconciliation, extinguishment of convertible debt, amount

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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