Quarterly report pursuant to Section 13 or 15(d)

Acquisitions ITS - Narrative (Details)

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Acquisitions ITS - Narrative (Details) (USD $)
 3 Months Ended 9 Months Ended 0 Months Ended 2 Months Ended 3 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Apr. 22, 2013
ITS [Member]
Apr. 18, 2013
ITS [Member]
Jun. 30, 2013
ITS [Member]
Sep. 30, 2013
ITS [Member]
Sep. 30, 2013
Term Note Due April 2018 [Member]
ITS [Member]
Jul. 30, 2013
Term Note Due April 2018 [Member]
ITS [Member]
Sep. 30, 2013
Accounts Receivable [Member]
ITS [Member]
Business Acquisition [Line Items]                        
Cash paid to, or on behalf of, ITS and its equity holders           $ 101,000,000            
Cash paid for acquisition           24,000,000            
Fair value of contingent consideration deposited in escrow for assets not acquired (1)           5,000,000 [1]            
Assets, Fair Value Disclosure                       0
Debt issuance costs                 5,400,000      
Long-term Debt 653,968,000   653,968,000   479,205,000         125,000,000    
Proceeds from issuance of term note             225,000,000          
Acquisition related costs               4,800,000        
Consulting expenses               19,200,000        
Debt instrument fixed interest rate                   7.50%    
Deferred acquisition costs                   5,200,000 5,300,000  
Revenues 237,762,000 165,301,000 630,918,000 520,795,000       58,500,000        
Net income $ 8,118,000 $ 10,831,000 $ 17,064,000 $ 57,265,000       $ 4,400,000        
[1] Based on the terms of the Agreement, $5.0 million of the $24.0 million in escrow to be paid to the seller is contingent upon certain future liabilities that could become due by ITS in certain jurisdictions. Any payments in relation to these liabilities will be deducted from the $5.0 million escrow amount and the net balance of the escrow will be paid to the seller. We estimate that the entire $5.0 million in escrow will be paid to the seller, and therefore, the estimated fair value of the consideration in escrow related to these liabilities is $5.0 million. We do not expect to receive any amount back from escrow, and therefore did not record a receivable from the escrow. Any changes to the fair value of the contingent consideration in the future of less than $5.0 million will result in recording a receivable from escrow. The receivable will be recorded at fair value. As of September 30, 2013, the fair value of the receivable is $0.0 million.