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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Income Tax Disclosure [Abstract] |  |  |  |
Income tax expense | $ 40,124 | $ 21,157 | $ 173,399 | $ 119,090
Effective tax rate | 31.00% | 24.00% | 34.00% | 31.00%
Federal statutory rate |  |  | 35.00% | 35.00%
Effective Income Tax Rate Reconciliation, Deduction, Qualified Production Activity, Amount | $ 2,800 | $ 2,784 | $ 13,100 | $ 12,519
Undistributed Earnings of Foreign Subsidiaries | (5,500) | 3,443 | 1,200 | 12,364
State income tax expense | 2,400 | 800 | 8,400 | 6,100
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount | 8,400 | (2,300) | 900 | (7,000)
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount | 600 | $ 6,700 | (2,000) | $ 4,000
Deferred Tax Assets, Tax Credit Carryforwards, Foreign | 28,000 |  | 28,000 |
Second component of tax deductible goodwill, net of tax | $ 1,200 |  | $ 1,200 |

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