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Acquisitions (Business Acquisition, Pro Forma Information) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Business Acquisition, Pro Forma Information [Abstract]
Revenues	$ 1,717,337	$ 1,494,542	$ 1,234,468
Operating income	59,598	52,538	22,676
Net income	$ 89,756	$ 58,732	$ 26,109
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax, Per Share, Basic	$ 1.11	$ 1.01	$ 0.44
Basic earnings per share (in dollars per share)	$ 1.68	$ 1.13	$ 0.51
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax, Per Share, Diluted	$ 1.09	$ 0.99	$ 0.44
Diluted earnings per share (in dollars per share)	$ 1.65	$ 1.10	$ 0.50
Weighted average number of shares outstanding	53,481	52,103	51,180
Weighted average number of shares and dilutive shares outstanding	54,555	53,190	52,062

X

- 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.

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