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 6 Months Ended 0 Months Ended 3 Months Ended 12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Apr. 22, 2013
ITS [Member]
Apr. 18, 2013
ITS [Member]
Jun. 30, 2014
ITS [Member]
Dec. 31, 2013
ITS [Member]
Jun. 30, 2014
Term Note Due April 2018 [Member]
ITS [Member]
Mar. 31, 2014
Term Note Due April 2018 [Member]
ITS [Member]
Jul. 30, 2013
Term Note Due April 2018 [Member]
ITS [Member]
Jun. 30, 2014
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           5,000,000 [1]              
Deferred acquisition costs                   5,000,000 5,200,000 5,500,000  
Assets, Fair Value Disclosure                         0
Debt issuance costs     7,300,000         5,400,000          
Long-term Debt 620,000,000   620,000,000   653,781,000         125,000,000      
Proceeds from issuance of term note             225,000,000            
Acquisition related costs                 22,500,000        
Debt instrument fixed interest rate                   7.50%      
Revenues 254,234,000 225,954,000 483,459,000 393,090,000                  
Net income 15,837,000 8,374,000 3,445,000 8,946,000                  
Business Acquisition, Escrow Funds Released               7,000,000          
Business Acquisition, Escrow Funds Received               $ 1,500,000          
[1] Based on the terms of the Acquisition Agreement, $5 million of the $24 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 million escrow amount and the net balance of the escrow will be paid to the seller. We estimate that the entire $5 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 million. Any changes to the fair value of the contingent consideration in the future of less than $5 million will result in recording a receivable from escrow. The receivable will be recorded at fair value. We do not expect to recover any amount from escrow related to the contingent consideration; therefore, as of June 30, 2014, the fair value of the receivable was zero.