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Long-term Equity-based Compensation - Schedule of Share-based Compensation, Nonemployee Director Deferred Stock Unit Award Plan (Details)
12 Months Ended
Dec. 31, 2019
$ / shares
shares
Number of DSUs  
Vested Balance at Beginning of the Year (in shares) | shares 57,340
Reduction for Shares Issued on Conversion (in shares) | shares (12,520)
Vested Balance at December 31, 2019 (in shares) | shares 44,820
Weighted- average Grant-date Fair Value Per DSU  
Vested Balance at Beginning of the Year (in dollars per share) | $ / shares $ 44.89
Reduction for Shares Issued on Conversion (in dollars per share) | $ / shares 45.44
Vested Balance at December 31, 2019 (in dollars per share) | $ / shares $ 44.74