Annual report pursuant to Section 13 and 15(d)

Goodwill and Intangible Assets - Narrative (Details)

v3.19.1
Goodwill and Intangible Assets - Narrative (Details) - USD ($)
 3 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]        
Amortization of intangible assets   $ 8,704,000 $ 9,301,000 $ 9,071,000
Impairment   3,203,000 0 0
Impairment of finite lived intangible assets     0 0
Impairment of intangible   $ 1,379,000 $ 0 $ 0
Customer relationships        
Finite-Lived Intangible Assets [Line Items]        
Acquired finite-lived intangible assets, weighted average useful life (in years)   6 years 10 months 15 days    
Trade names        
Finite-Lived Intangible Assets [Line Items]        
Acquired finite-lived intangible assets, weighted average useful life (in years)   8 years 11 months 20 days    
Minimum | Customer relationships        
Finite-Lived Intangible Assets [Line Items]        
Finite-lived intangible asset, useful life (in years)   6 years    
Minimum | Trade names        
Finite-Lived Intangible Assets [Line Items]        
Finite-lived intangible asset, useful life (in years)   10 years    
Maximum | Customer relationships        
Finite-Lived Intangible Assets [Line Items]        
Finite-lived intangible asset, useful life (in years)   10 years    
Maximum | Trade names        
Finite-Lived Intangible Assets [Line Items]        
Finite-lived intangible asset, useful life (in years)   20 years    
Cementing        
Finite-Lived Intangible Assets [Line Items]        
Impairment $ 3,200,000 $ 3,200,000    
Cementing | Customer relationships        
Finite-Lived Intangible Assets [Line Items]        
Impairment of finite lived intangible assets 1,000,000      
Impairment of intangible   1,000,000    
Cementing | Trade names        
Finite-Lived Intangible Assets [Line Items]        
Impairment of finite lived intangible assets $ 200,000      
Impairment of intangible   200,000    
Silverback Energy | Trade names        
Finite-Lived Intangible Assets [Line Items]        
Impairment of intangible   $ 200,000