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Income Taxes (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Income Tax Disclosure [Abstract]        
Income tax expense $ 36,559 $ 83,850 $ 75,664 $ 120,499
Effective tax rate 38.00% 38.00% 36.00% 38.00%
Federal statutory rate     35.00% 35.00%
State income tax expense 1,914 4,687 3,803 6,709
Undistributed Earnings of Foreign Subsidiaries 3,303   7,190  
Effective Income Tax Rate Reconciliation, Deduction, Qualified Production Activity, Amount 2,647   5,424  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense 3,090 (1,027) 6,424  
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount 1,134 2,334 2,151 2,334
Deferred Tax Assets, Tax Credit Carryforwards 2,512   3,159  
Deferred Tax Assets, Tax Credit Carryforwards, Foreign 30,000   30,000  
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation     4,708  
Second component of tax deductible goodwill, net of tax $ 807   $ 807