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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Income Tax Disclosure [Abstract] |  |
Income tax expense | $ 73,082 | $ 58,543
Effective tax rate | 34.00% | 33.00%
Federal statutory rate | 35.00% | 35.00%
Effective Income Tax Rate Reconciliation, Deduction, Qualified Production Activity, Amount | $ 5,900 | $ 5,300
Undistributed Earnings of Foreign Subsidiaries | (4,100) | (3,500)
State income tax expense | 3,416 | 3,215
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount | 2,266 | $ 2,000
Deferred Tax Assets, Tax Credit Carryforwards, Foreign | 37,000 |
Second component of tax deductible goodwill, net of tax | $ 402 |

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