Annual report pursuant to Section 13 and 15(d)

STOCK-BASED COMPENSATION - Summary of Changes in Nonvested Stock and Weighted-Average Grant Date Fair Value (Details)

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STOCK-BASED COMPENSATION - Summary of Changes in Nonvested Stock and Weighted-Average Grant Date Fair Value (Details) - Nonvested Stock - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Shares      
Nonvested at the beginning of the year (in shares) 1,075 1,011 1,187
Granted (in shares) 386 563 498
Vested (in shares) (256) (417) (632)
Forfeited (in shares) (164) (82) (42)
Nonvested at the ending of the year (in shares) 1,041 1,075 1,011
Weighted-Average Grant Date Fair Value      
Nonvested at the beginning of the year (in dollars per share) $ 120.11 $ 109.48 $ 87.54
Granted (in dollars per share) 115.68 109.71 89.45
Vested (in dollars per share) 127.17 87.09 56.53
Forfeited (in dollars per share) 119.36 115.40 104.24
Nonvested at the ending of the year (in dollars per share) $ 118.25 $ 120.11 $ 109.48