LONG-TERM INCENTIVE COMPENSATION (Details 1) - Restricted Shares Subject Only to a Service Condition	9 Months Ended
	Sep. 30, 2017 $ / shares shares
Restricted shares subject only to a service condition:
Non-vested, beginning balance, shares | shares	607,501
Granted (shares) | shares	143,460
Vested (shares) | shares	(182,085)
Forfeited (shares) | shares	(36,579)
Non-vested, ending balance, shares | shares	532,297
Non-vested, beginning balance, (dollars per share) | $ / shares	$ 54.67
Granted (dollars per share) | $ / shares	61.20
Vested (dollars per share) | $ / shares	57.43
Forfeited (dollars per share) | $ / shares	55.11
Non-vested, ending balance, (dollars per share) | $ / shares	$ 55.46