CAPITAL STOCK AND SHARE-BASED COMPENSATION - Non-Vested Stock Option Activity (Details)	12 Months Ended
	Dec. 31, 2019 $ / shares shares
Number of Shares
Non-vested stock options beginning balance (shares) | shares	370,470
Granted (shares) | shares	142,122
Vested (shares) | shares	(194,638)
Forfeited (shares) | shares	(12,204)
Non-vested stock options ending balance (shares) | shares	305,750
Weighted Average Grant Date Fair Value
Non-vested stock options beginning balance (usd per share) | $ / shares	$ 30.97
Granted (usd per share) | $ / shares	54.42
Vested (usd per share) | $ / shares	31.19
Forfeited (usd per share) | $ / shares	32.84
Non-vested stock options ending balance (usd per share) | $ / shares	$ 41.66