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 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Apr. 22, 2013
ITS [Member]
Apr. 18, 2013
ITS [Member]
Sep. 30, 2014
ITS [Member]
Sep. 30, 2014
ITS [Member]
Dec. 31, 2013
ITS [Member]
Sep. 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]
Sep. 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                     4,800,000 5,200,000 5,600,000  
Assets, Fair Value Disclosure                           0
Debt issuance costs     7,600,000         5,400,000            
Long-term Debt 617,500,000   617,500,000   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 242,012,000 237,762,000 725,471,000 630,851,000                    
Net income 12,877,000 8,118,000 16,322,000 17,064,000                    
Business Acquisition, Escrow Funds Released               10,500,000 10,500,000          
Business Acquisition, Escrow Funds Received               $ 1,250,000 $ 2,750,000          
[1] Based on the terms of the Acquisition Agreement, $5 million of the $24 million in escrow to be paid to the seller was contingent upon certain future liabilities that could become due by ITS in certain jurisdictions. Any payments in relation to these liabilities would be deducted from the $5 million escrow amount and the net balance of the escrow would be paid to the seller. During the third quarter of 2014, we released $2 million to the seller, leaving $3 million remaining in escrow. We estimate that the entire $3 million remaining in escrow will be paid to the seller, and therefore, the estimated fair value of the consideration in escrow related to these liabilities is $3 million. Any changes to the fair value of the contingent consideration in the future of less than $3 million will result in recording a receivable from escrow which will be recorded at fair value. We do not expect to recover any amount from escrow related to the contingent consideration; therefore, as of September 30, 2014, the fair value of the receivable was zero.