Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Tax Disclosure [Abstract]
Income tax expense	$ 43,358	$ 13,078	$ 155,609	$ 88,742
Effective tax rate	36.00%	20.00%	35.00%	32.00%
Federal statutory rate			35.00%	35.00%
State income tax expense	$ 2,775	$ 872	$ 9,335	$ 4,675
Undistributed Earnings of Foreign Subsidiaries	409	3,176	6,610	10,367
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense		(5,709)		715
Effective Income Tax Rate Reconciliation, Deduction, Qualified Production Activity, Amount	4,332	2,990	14,515	8,414
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	3,261	1,930	10,049	5,089
Deferred Tax Assets, Tax Credit Carryforwards		$ (1,350)		$ 802
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	35,000		35,000
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation			4,297
Second component of tax deductible goodwill, net of tax	$ 1,200		$ 1,200