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EARNINGS PER SHARE - (Narrative) (Details) - USD ($)		12 Months Ended
EARNINGS PER SHARE - (Narrative) (Details) - USD ($)	Feb. 23, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Stock repurchased
Treasury stock activity, shares	475,920
Shares acquired average price	$ 120.33
Treasury stock activity	$ 57,267,454		$ 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)		313,500	379,500	141,776
Restricted Stock
Antidilutive securities excluded from computation of diluted earnings per share
Antidilutive securities excluded from computation of diluted earnings per share (in shares)		161,155	130,286