Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Liabilities and Assets Measured at Fair Value (Details)

v3.20.4
Fair Value Measurements - Liabilities and Assets Measured at Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Earn-out obligation-current $ 0 $ 31,700
Earn-out obligation-long-term 0 5,000
Other current assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps 1,600 1,500
Fair Value, Measurements, Recurring | Other assets | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Non-COLI assets held in Deferred Supplemental Compensation Plan 1,120 710
Fair Value, Measurements, Recurring | Other current assets | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps 1,603 1,473
Current Portion of Earn Out Obligations | Fair Value, Measurements, Recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Earn-out obligation-current 0 31,700
Earn Out Obligations | Fair Value, Measurements, Recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Earn-out obligation-long-term $ 0 $ 5,000