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Income Tax Reconciliation (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Income Tax Disclosure [Abstract] |  |  |
Tax at the U.S. federal statutory rate | $ 42,067 | $ 42,783 | $ 37,480
State income taxes, net of federal tax benefit of $273, $337 and $262, respectively | 508 | 625 | 487
Effect of indefinitely reinvesting foreign earnings | (2,281) | 0 | 0
Tax restructuring | (3,979) | 0 | 0
Additional foreign tax credit claimed from prior periods | 0 | (778) | 0
Other taxes and adjustments, net | (602) | (1,255) | (1,017)
Provision for income taxes | 35,713 | 41,375 | 36,950
Effective tax rate | 29.7133% | 33.8482% | 34.5047%
Federal income tax benefit on state and local taxes | $ 273 | $ 337 | $ 262

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