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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Income Tax Disclosure [Abstract] |  |  |  |
Income tax expense | $ 50,997 | $ 36,559 | $ 112,251 | $ 75,664
Effective tax rate | 37.00% | 38.00% | 34.00% | 36.00%
Federal statutory rate |  |  | 35.00% | 35.00%
State income tax expense | $ 2,726 | $ 1,914 | $ 6,560 | $ 3,803
Undistributed Earnings of Foreign Subsidiaries | 939 | 3,303 | 6,201 | 7,190
Effective Income Tax Rate Reconciliation, Deduction, Qualified Production Activity, Amount | 5,015 | 2,647 | 10,183 | 5,424
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense |  | 3,090 |  | 6,424
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount | 3,957 | 2,512 | 6,788 | 3,159
Deferred Tax Assets, Tax Credit Carryforwards |  | $ 1,134 |  | $ 2,151
Deferred Tax Assets, Tax Credit Carryforwards, Foreign | 37,000 |  | 37,000 |
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation |  |  | 4,038 |
Second component of tax deductible goodwill, net of tax | $ 800 |  | $ 800 |

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