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Stock-Based Compensation - Schedule of Nonvested Restricted Stock Awards Activity (Details) - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Number of shares    
Nonvested, beginning of period (in shares) 739 859
Granted (in shares) 321 410
Vested (in shares) (290) (492)
Forfeited (in shares) (61) (38)
Nonvested, end of period (in shares) 709 739
Weighted-average grant date fair value    
Nonvested, beginning of period (in dollars per share) $ 225.93 $ 187.01
Granted (in dollars per share) 318.75 278.29
Vested (in dollars per share) 209.05 204.24
Forfeited (in dollars per share) 225.23 191.51
Nonvested, end of period (in dollars per share) $ 275.00 $ 225.93