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Income Taxes (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Difference between the income tax computation by the company and the statutory body
Provision at the U.S. federal statutory rate	$ 79,580	$ 63,760	$ 57,540
Increase (decrease) resulting from:
State income tax, net of benefit for federal deduction	4,230	4,448	5,267
Foreign income tax rate differential	(2,799)	(2,002)	(3,188)
Employment credits	(821)	(407)	(481)
Changes in valuation allowances	749	14,667	9,507
Nondeductible Goodwill	34	4,651	0
Income Tax Reconciliation Goodwill created from Restructuring	0	0	(10,209)
Stock-based compensation	368	386	245
Income tax reconciliation convertible debt redemption	0	0	9,727
Other	(1,035)	2,669	2,988
Provision for income taxes	$ 80,306	$ 88,172	$ 71,396

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