Income Taxes (Schedule of Income Taxes Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income tax at federal statutory rate	$ 69,710	$ 40,029	$ 33,270
State income tax, net of federal income tax impact	6,480	4,386	3,376
Foreign tax rate differential	(614)	(82)	0
Manufacturing credit pursuant to Jobs Creation Act	(5,067)	(2,336)	(2,258)
Federal tax credits	(1,736)	(919)	(681)
Other	728	(1,054)	(916)
Provision for income taxes	$ 69,501	$ 40,024	$ 32,791