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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Intangible assets      
Weighted Average Life 16 years    
Gross Carrying Amount $ 109,215   $ 109,215
Accumulated Amortization (41,755)   (39,386)
Amortization expense of intangible assets 2,400 $ 2,700  
Estimated future amortization expense for intangible assets      
2020 (remaining nine months) 6,448    
2021 7,577    
2022 6,416    
2023 5,581    
2024 4,862    
Thereafter 36,576    
Total $ 67,460   69,829
Tradename      
Intangible assets      
Weighted Average Life 9 years    
Gross Carrying Amount $ 16,040   16,040
Accumulated Amortization (13,714)   (13,216)
Estimated future amortization expense for intangible assets      
Total $ 2,326   2,824
Customer relationships      
Intangible assets      
Weighted Average Life 17 years    
Gross Carrying Amount $ 91,000   91,000
Accumulated Amortization (26,128)   (24,353)
Estimated future amortization expense for intangible assets      
Total $ 64,872   66,647
Non-compete agreements      
Intangible assets      
Weighted Average Life 5 years    
Gross Carrying Amount $ 1,900   1,900
Accumulated Amortization (1,653)   (1,580)
Estimated future amortization expense for intangible assets      
Total $ 247   320
Other      
Intangible assets      
Weighted Average Life 3 years    
Gross Carrying Amount $ 275   275
Accumulated Amortization (260)   (237)
Estimated future amortization expense for intangible assets      
Total $ 15   $ 38