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Business Combination (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Feb. 28, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Business Acquisition [Line Items]            
Note payable, carrying value   $ 69,158   $ 69,158   $ 79,611
Liabilities:            
Operating revenues   258,349 $ 222,548 573,347 $ 475,549  
Net income   $ 29,827 $ 19,266 $ 99,858 $ 60,020  
UniRush, LLC [Member]            
Business Combination, Consideration Transferred [Abstract]            
Cash, including proceeds from notes payable $ 142,154          
Fair value of contingent consideration 21,500          
Total consideration 163,654          
Contingent consideration, earn-out payable $ 20,000          
Contingent consideration, earn-out period 5 years          
Assets:            
Cash and cash equivalents $ 656          
Accounts receivable, net 5,745          
Prepaid expenses and other assets 5,146          
Property and equipment, net 4,233          
Intangible assets 69,000          
Goodwill 93,435          
Total assets: 178,215          
Liabilities:            
Accounts payable 10,861          
Other liabilities 3,700          
Total liabilities: 14,561          
Net assets acquired 163,654          
Subordinated Debt [Member] | UniRush, LLC [Member]            
Business Acquisition [Line Items]            
Cash raised from debt 20,000          
Revolving Facility [Member] | Line of Credit [Member] | UniRush, LLC [Member]            
Business Acquisition [Line Items]            
Note payable, carrying value 95,000          
Customer Relationships [Member] | UniRush, LLC [Member]            
Liabilities:            
Finite-lived intangibles 58,500          
Trade Names [Member] | UniRush, LLC [Member]            
Liabilities:            
Finite-lived intangibles $ 5,500          
Acquired finite-lived intangible assets, weighted average useful life       15 years    
Minimum [Member] | Customer Relationships [Member] | UniRush, LLC [Member]            
Liabilities:            
Acquired finite-lived intangible assets, weighted average useful life       5 years    
Maximum [Member] | Customer Relationships [Member] | UniRush, LLC [Member]            
Liabilities:            
Acquired finite-lived intangible assets, weighted average useful life       10 years