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Stock-Based Compensation - Phantom Stock Units Summary (Details) - Phantom Share Units (PSUs) [Member] - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Outstanding, beginning balance (in shares) 89 83 63
Converted upon acquisition (in shares)   0 21
Granted (in shares) 38 55 41
Issued (in shares) (40) (42) (35)
Forfeited, Number (5) (7) (7)
Outstanding, ending balance (in shares) 82 89 83
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Outstanding, beginning balance (in dollars per share) $ 62.85    
Granted (in dollars per share) 87.27 $ 60.49 $ 66.67
Released (in dollars per share) 63.87    
Forfeitures (in dollars per share) 70.99    
Outstanding, ending balance (in dollars per share) $ 73.13 $ 62.85  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested $ 2,971 $ 2,625 $ 2,409