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Acquisitions (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Jun. 30, 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 300,678 587,365  
Net income $ 10,722 $ 19,318