Income Taxes (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Tax Disclosure [Abstract]
Income tax expense	$ 13,078	$ 34,784	$ 88,742	$ 155,283
Effective tax rate	20.00%	37.00%	32.00%	38.00%
Federal statutory rate			35.00%	35.00%
State income tax expense	872	1,083	4,675	7,792
Undistributed Earnings of Foreign Subsidiaries	(3,176)		(10,367)
Effective Income Tax Rate Reconciliation, Deduction, Qualified Production Activity, Amount	2,990		8,414
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	(5,709)	11,204	715	11,237
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	1,930	1,784	5,089	4,172
Deferred Tax Assets, Tax Credit Carryforwards	(1,350)		802
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	33,000		33,000
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation			5,662
Second component of tax deductible goodwill, net of tax	1,200		1,200
Tax Adjustments, Settlements, and Unusual Provisions			$ 1,381