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Acquisitions (Business Acquisition, Pro Forma Information) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Business Acquisition, Pro Forma Information [Abstract]  
Business Acquisition, Pro Forma Information, Description The pro forma financial information gives effect to certain adjustments, including: the amortization of intangible assets and interest expense on acquisition-related debt, and increased number of common shares as a result of the acquisition. Acquisition-related costs are assumed to have occurred at the beginning of the year prior to acquisition.
Revenues $ 342,721
Business Acquisitions Pro Forma Operating Income 13,464
Operating income 7,839
Net income $ 8,175
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax, Per Share, Basic $ 0.15
Basic earnings per share (in dollars per share) $ 0.16
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax, Per Share, Diluted $ 0.15
Diluted earnings per share (in dollars per share) $ 0.16
Weighted average number of shares outstanding 51,574
Weighted average number of shares and dilutive shares outstanding 52,459