Income Taxes (Schedule of Income Tax Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Federal current	$ 32,090	$ 51,260	$ 55,227
State current	5,665	6,606	6,616
Foreign current	1,250	220	1,472
Current income tax expense (benefit), total	39,005	58,086	63,315
Federal deferred	33,912	4,503	(9,668)
State deferred	4,530	535	1,279
Deferred income tax expense (benefit), total	38,442	5,038	(8,389)
Total income tax expense	$ 77,447	$ 63,124	$ 54,926