Quarterly report pursuant to Section 13 or 15(d)

Acquistions - Narrative (Details)

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Acquistions - Narrative (Details) (USD $)
 3 Months Ended 6 Months Ended 0 Months Ended 2 Months Ended 3 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Apr. 22, 2013
ITS [Member]
facility
Apr. 18, 2013
ITS [Member]
Jun. 30, 2013
ITS [Member]
Jun. 30, 2013
ITS [Member]
Jun. 30, 2013
Term Note Due April 2018 [Member]
Dec. 31, 2012
Term Note Due April 2018 [Member]
Jun. 30, 2013
Term Note Due April 2018 [Member]
ITS [Member]
Business Acquisition [Line Items]                        
Cash paid to, or on behalf of, ITS and its equity holders           $ 101,000,000            
Operating facilities acquired           21            
Debt issuance costs                 5,400,000      
Long-term Debt 599,147,000   599,147,000   479,205,000         125,000,000 0 125,000,000
Proceeds from issuance of term note             225,000,000          
Debt instrument fixed interest rate                       7.50%
Acquisition related costs               11,400,000        
Consulting expenses               14,400,000        
Revenues 226,001,000 178,925,000 393,156,000 355,494,000       24,200,000        
Net income $ 8,374,000 $ 20,108,000 $ 8,946,000 $ 46,434,000       $ 700,000