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Acquisition (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2011	Mar. 31, 2012
Acquisition [Abstract]
Revenue	$ 663,657
Net income	$ 11,311
Basic	$ 0.31
Diluted	$ 0.31
Date of would be acquisition		Jan. 01, 2011

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- Definition

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

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The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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-Publisher FASB

-Name Accounting Standards Codification

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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