Income Taxes from Continuing Operations (Details) - Income Tax Rate Reconciliation - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Computed “expected” tax provision	$ 94,955	$ 81,255	$ 8,870
Change in income taxes resulting from:
State income taxes, net of Federal income tax	4,501	5,520	167
Foreign income tax provision (benefit)	1,580	(1,130)	482
Deduction for domestic production activities	(7,280)	(6,882)	(1,323)
Stock compensation	(11,395)	0	0
R&D tax credits	(825)	(677)	(508)
Nondeductible acquisition fees	39	165	2,823
Other expense (benefit), net	2,564	682	(673)
Valuation allowance change	2,918	2,425	1,116
Total income tax expense	$ 87,057	$ 81,358	$ 10,954