Income Taxes from Continuing Operations (Details) - The Geographical Allocation of the Companys Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Pre-tax income from continuing U.S. operations	$ 287,880	$ 241,665	$ 33,320
Pre-tax loss from continuing foreign operations	(16,580)	(9,509)	(7,978)
Total pre-tax income from continuing operations	$ 271,300	$ 232,156	$ 25,342