Acquisitions (Tables)

3 Months Ended

Mar. 31, 2013

Business Combinations [Abstract]

Schedule of allocated purchase price paid to fair value of acquired net assets for acquisitions

	2012 Acquisitions
Accounts receivable	$	15,175
Other current assets	1,240
Property and equipment	32,387
Goodwill	76,550
Customer relationship intangible assets	4,932
Other noncurrent assets	623
Accounts payable and other liabilities	(42,192		)
Total	$	88,715

Business Acquisition, Pro Forma Information [Table Text Block]

The following supplemental unaudited pro forma financial information of the Company for the quarter ended March 31, 2012 includes the results of operations for the 2012 acquisitions, in the aggregate, as if the acquisitions had been completed on January 1, 2011.

	Unaudited Pro Forma for the Three Months Ended
	March 31, 2012
	(in thousands)
Revenues	$	286,687
Net income	$	8,596