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Goodwill and Other Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Intangible Assets [Line Items]      
Average Life (Years)   15 years 8 months 12 days  
Intangible amortization expense   $ 4,656 $ 4,687
Intangible assets subject to amortization, Cost   66,376 66,376
Intangible assets subject to amortization, Accumulated Amortization   (30,939) (26,283)
Intangible assets subject to amortization, Net Book Value   35,437 40,093
Customer relationships      
Intangible Assets [Line Items]      
Intangible asset impairment charge $ 1,249    
Intangible assets subject to amortization, Cost   55,454 55,454
Intangible assets subject to amortization, Accumulated Amortization   (25,587) (22,311)
Intangible assets subject to amortization, Net Book Value   $ 29,867 33,143
Customer relationships | Minimum      
Intangible Assets [Line Items]      
Average Life (Years)   12 years  
Customer relationships | Maximum      
Intangible Assets [Line Items]      
Average Life (Years)   20 years  
Technology and software      
Intangible Assets [Line Items]      
Intangible assets subject to amortization, Cost   $ 7,101 7,101
Intangible assets subject to amortization, Accumulated Amortization   (4,024) (3,095)
Intangible assets subject to amortization, Net Book Value   $ 3,077 4,006
Technology and software | Minimum      
Intangible Assets [Line Items]      
Average Life (Years)   7 years  
Technology and software | Maximum      
Intangible Assets [Line Items]      
Average Life (Years)   10 years  
Trademarks      
Intangible Assets [Line Items]      
Intangible assets subject to amortization, Cost   $ 3,330 3,330
Intangible assets subject to amortization, Accumulated Amortization   (877) (487)
Intangible assets subject to amortization, Net Book Value   $ 2,453 2,843
Trademarks | Minimum      
Intangible Assets [Line Items]      
Average Life (Years)   7 years 6 months  
Trademarks | Maximum      
Intangible Assets [Line Items]      
Average Life (Years)   10 years  
Non-compete agreements      
Intangible Assets [Line Items]      
Intangible assets subject to amortization, Cost   $ 491 491
Intangible assets subject to amortization, Accumulated Amortization   (451) (390)
Intangible assets subject to amortization, Net Book Value   $ 40 $ 101
Non-compete agreements | Minimum      
Intangible Assets [Line Items]      
Average Life (Years)   5 years  
Non-compete agreements | Maximum      
Intangible Assets [Line Items]      
Average Life (Years)   8 years