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Executive Bonus Plan - Narrative (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 03, 2020
USD ($)
acquisition
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]        
Number of trading days prior to end of applicable quarter, shares determined upon election by volume-weighted average price | acquisition       10,000
Number of trading days after the end of applicable quarter, shares determined upon election by volume-weighted average price | acquisition       10
Non-deferred incentive bonus threshold for pro rata adjustment | $       $ 7,500
Deferred Bonus        
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]        
Company's Management Reported Operating Income (MORI) threshold for bonus plan (up to) 20.00%      
Bonus plan compensation expense | $ $ 34,340 $ 31,061 $ 27,641