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Acquisitions (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2013
Schedule of allocated purchase price paid to fair value of acquired net assets for 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
Revenues 286,687  
Net income $ 8,596