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Income Tax Reconciliation (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
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