Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Income Tax Expense (Benefit) (in Dollars)	$ 18,282	$ 17,850	$ 42,968	$ 38,640
Effective Income Tax Rate Reconciliation (as a Percent)	22.80%	35.40%	29.30%	35.60%
Valuation allowance	$ 10,400		$ 10,400		$ 8,800
Unrecognized Tax Benefits (in Dollars)	2,400		2,400		$ 2,300
Unrecognized tax benefits that would impact the Company's effective tax rate	1,600		1,600
Unrecognized tax benefits that would impact goodwill	$ 800		$ 800