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Income Tax Reconciliation (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]
Tax at the U.S. federal statutory rate	$ 42,914	$ 37,688	$ 27,976
State income taxes, net of federal tax benefit of $337, $262 and $249, respectively	625	487	462
Additional foreign tax credit claimed from prior periods	(778)	0	0
Other taxes and adjustments, net	(1,255)	(1,017)	192
Provision for income taxes	41,506	37,158	28,630
Federal income tax benefit on state and local taxes	$ 337	$ 262	$ 249

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Income Tax Reconiliation, State and Local Income Taxes, Federal Benefit

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The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to pretax Income or Loss from continuing operations; income tax expense or benefit may include interest and penalties on tax uncertainties based on the entity's accounting policy.

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