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EARNINGS PER SHARE - (Narrative) (Details) - USD ($)		12 Months Ended
EARNINGS PER SHARE - (Narrative) (Details) - USD ($)	Feb. 23, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Stock repurchased
Treasury stock activity (in shares)	475,920
Common stock, par value (in dollars per share)		$ 0.01	$ 0.01
Treasury stock acquired (in dollars per share)	$ 120.33
Treasury stock activity	$ 57,267,453			$ 1,231,000
Stock Options
Antidilutive securities excluded from computation of diluted earnings per share
Antidilutive securities excluded from computation of diluted earnings per share (in shares)		425,908	313,500	379,500
Restricted Stock
Antidilutive securities excluded from computation of diluted earnings per share
Antidilutive securities excluded from computation of diluted earnings per share (in shares)		205,979	161,155	130,286