Income Taxes (Schedule of Components 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	$ 52,869	$ 52,514	$ 24,426
State	(3,119)	4,763	3,496
Deferred expense	47,269	44,666	51,585
Total income tax expense	$ 97,019	$ 101,943	$ 79,507