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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Intangible assets        
Weighted Average Life   15 years    
Gross Carrying Amount   $ 130,965 $ 84,250  
Accumulated Amortization   (49,767) (39,450)  
Amortization expense of intangible assets   11,302 8,689 $ 6,597
Estimated future amortization expense for intangible assets        
2019   11,559    
2020   8,814    
2021   7,577    
2022   6,416    
2023   5,394    
Thereafter   41,438    
Total   $ 81,198 44,800  
Tradename        
Intangible assets        
Weighted Average Life   9 years    
Gross Carrying Amount   $ 31,390 32,175  
Accumulated Amortization   (25,156) (22,238)  
Estimated future amortization expense for intangible assets        
Total   $ 6,234 9,937  
Tradename | Pipeline | Selling, general and administrative expenses        
Intangible assets        
Impairment of intangible asset $ 500      
Customer relationships        
Intangible assets        
Weighted Average Life   16 years    
Gross Carrying Amount   $ 97,400 49,900  
Accumulated Amortization   (23,079) (16,338)  
Estimated future amortization expense for intangible assets        
Total   $ 74,321 33,562  
Non-compete agreements        
Intangible assets        
Weighted Average Life   5 years    
Gross Carrying Amount   $ 1,900 1,900  
Accumulated Amortization   (1,387) (820)  
Estimated future amortization expense for intangible assets        
Total   $ 513 1,080  
Other        
Intangible assets        
Weighted Average Life   3 years    
Gross Carrying Amount   $ 275 275  
Accumulated Amortization   (145) (54)  
Estimated future amortization expense for intangible assets        
Total   $ 130 $ 221