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Goodwill and Intangible Assets - Intangible Assets Summary (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]      
Impairment of Intangible Assets, Finite-lived $ 0 $ 0  
Gross Carrying Value 362,823,000 293,823,000  
Accumulated Amortization (82,236,000) (51,127,000)  
Net Book Value 280,587,000 242,696,000  
Amortization of intangible assets 31,110,000 23,021,000 $ 23,205,000
Customer Relationships [Member]      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Value 309,773,000 251,273,000  
Accumulated Amortization (70,295,000) (43,707,000)  
Net Book Value $ 239,478,000 207,566,000  
Weighted Average Useful Lives 13 years 56 days    
Trade Names [Member]      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Value $ 44,086,000 38,586,000  
Accumulated Amortization (9,347,000) (6,192,000)  
Net Book Value $ 34,739,000 32,394,000  
Weighted Average Useful Lives 14 years 205 days    
Patents [Member]      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Value $ 3,000,000 3,000,000  
Accumulated Amortization (818,000) (545,000)  
Net Book Value $ 2,182,000 2,455,000  
Weighted Average Useful Lives 11 years    
Other [Member]      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Value $ 5,964,000 964,000  
Accumulated Amortization (1,776,000) (683,000)  
Net Book Value $ 4,188,000 $ 281,000  
Weighted Average Useful Lives 4 years 362 days