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Income Taxes (Details Textual) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Income Taxes (Textual) [Abstract]
Provisions for income taxes	$ 15,451,000	$ 17,492,000	$ 23,253,000	$ 29,149,000
Percentage of pre-tax income			36.00%	37.00%
State NOL carryforwards	1,000,000		1,000,000		700,000
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Remaining state tax NOL carryforwards					$ 8,000,000

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The sum of domestic, foreign and state and local operating loss carryforwards, before tax effects, utilized during the current reporting period.

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A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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