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Income Taxes (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Taxes (Textual) [Abstract] |  |  |  |
U.S. federal statutory corporate tax rate | 35.00% | 35.00% | 35.00% |
Provision for income taxes | $ 88,172 | $ 71,396 | $ 77,903 |
Effective tax rate | 48.40% | 43.40% | 40.60% | 37.70%
Deferred Tax Liabilities, Gross, Noncurrent | $ 215,300 | $ 202,100 |  |
Deferred Tax Liabilities, Net, Noncurrent | 150,753 | 141,239 |  |
Long-term deferred tax assets | 65,800 | 63,700 |  |
Provision for deferred taxes on undistributed earnings | 31,700 |  |  |
Foreign earnings potential tax | 7,700 |  |  |
No unrecognized tax benefits | 0 | 0 |  |
Foreign [Member] |  |  |  |
Income Taxes (Textual) [Abstract] |  |  |  |
Operating Loss Carryforwards | 62,400 |  |  |
Deferred Tax Liabilities, Net, Noncurrent | 2,100 | $ 9,600 |  |
State [Member] |  |  |  |
Income Taxes (Textual) [Abstract] |  |  |  |
Operating Loss Carryforwards | $ 258,000 |  |  |
Minimum [Member] |  |  |  |
Income Taxes (Textual) [Abstract] |  |  |  |
Operating Loss Carryforwards, Expiration Dates | Dec. 31, 2016 |  |  |
Maximum [Member] |  |  |  |
Income Taxes (Textual) [Abstract] |  |  |  |
Operating Loss Carryforwards, Expiration Dates | Dec. 31, 2035 |  |  |

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