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Amortizable Intangible Assets - Amortizable Intangible Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]    
Gross carrying value $ 1,959,207 $ 1,837,873
Accumulated amortization (1,042,439) (939,066)
Net carrying value 916,768 898,807
Purchased Customer Accounts    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying value 1,925,326 1,804,404
Accumulated amortization (1,011,574) (909,415)
Net carrying value $ 913,752 $ 894,989
Weighted average life in years 15 years 14 years 10 months 24 days
Non-compete Agreements    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying value $ 33,881 $ 33,469
Accumulated amortization (30,865) (29,651)
Net carrying value $ 3,016 $ 3,818
Weighted average life in years 4 years 7 months 6 days 4 years 6 months