Income Taxes (Schedule of Provisions of Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current Income Tax Expense (Benefit), Continuing Operations
Federal	$ 31,292	$ 32,142	$ 23,430
State	7,670	6,142	4,129
Total current provision	38,962	38,284	27,559
Deferred Income Tax Expense (Benefit), Continuing Operations
Federal	466	(4,545)	68
State	596	(948)	201
Total deferred provision	1,062	(5,493)	269
Provision for income taxes	$ 40,024	$ 32,791	$ 27,828