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Fair Value - Assets and Liabilities Measured at Fair Value and Related Hierarchy Levels (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Financial Assets:    
Total investment securities $ 36,855 $ 37,273
Prepaid expenses and other current assets    
Financial Assets:    
Executive deferred compensation plan trust 1,500 900
Other assets    
Financial Assets:    
Executive deferred compensation plan trust 9,300 8,700
Interest Rate Swaps    
Financial Assets:    
Interest rate swaps 7,400  
Interest Rate Swaps | Other current liabilities    
Liabilities    
Interest rate swaps 24,300 22,000
Interest Rate Swaps | Other Liabilities    
Liabilities    
Interest rate swaps 8,100 22,900
Level 1    
Financial Assets:    
Executive deferred compensation plan trust 10,851 9,586
Level 1 | Money market funds    
Financial Assets:    
Money market funds 0 335,449
Level 1 | Fixed-income mutual fund    
Financial Assets:    
Total investment securities 27,440 27,728
Level 2 | Municipal bonds    
Financial Assets:    
Total investment securities 109 197
Level 2 | Asset-backed securities    
Financial Assets:    
Total investment securities 177 210
Level 2 | Mortgage-backed securities    
Financial Assets:    
Total investment securities 129 138
Level 2 | Interest Rate Swaps    
Financial Assets:    
Interest rate swaps 7,449 0
Liabilities    
Interest rate swaps 32,379 44,938
Level 3 | Contingent consideration derivative    
Liabilities    
Interest rate swaps 72,100 0
Net Asset Value | Pooled investment fund measured at NAV    
Financial Assets:    
Total investment securities $ 9,000 $ 9,000