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STOCK INCENTIVE PLANS - Performance Shares and Restricted Stock Units (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Conversion ratio	1
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Outstanding at beginning of period (in shares) | shares	98,340	73,160	57,236
Issued (in shares) | shares	52,371	60,414	47,264
Canceled (in shares) | shares	(66,579)	(11,724)	(13,108)
Vested (in shares) | shares	0	(23,510)	(18,232)
Outstanding at end of period (in shares) | shares	84,132	98,340	73,160
Weighted Average Price Per Share [Abstract]
Outstanding at beginning of period, weighted average price per share (in dollars per share) | $ / shares	$ 203.91	$ 232.72	$ 220.00
Issued, weighted average price per share (in dollars per share) | $ / shares	216.99	191.38	227.26
Cancelled, weighted average price per share (in dollars per share) | $ / shares	201.84	241.41	215.01
Vested, weighted average price per share (in dollars per share) | $ / shares	0.00	242.65	191.36
Outstanding at end of period, weighted average price per share (in dollars per share) | $ / shares	$ 213.69	$ 203.91	$ 232.72
Unearned unrecognized compensation | $	$ 11,400
Weighted average period to recognize (in years)	2 years 8 months 12 days
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Conversion ratio	1
Fair value of shares vested | $	$ 20,834	$ 21,367	$ 25,865
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Outstanding at beginning of period (in shares) | shares	373,403	432,783	560,351
Issued (in shares) | shares	129,378	113,909	104,220
Canceled (in shares) | shares	(47,488)	(62,869)	(38,124)
Vested (in shares) | shares	(102,374)	(110,420)	(193,664)
Outstanding at end of period (in shares) | shares	352,919	373,403	432,783
Weighted Average Price Per Share [Abstract]
Outstanding at beginning of period, weighted average price per share (in dollars per share) | $ / shares	$ 221.77	$ 213.45	$ 182.40
Issued, weighted average price per share (in dollars per share) | $ / shares	222.53	230.36	234.21
Cancelled, weighted average price per share (in dollars per share) | $ / shares	229.36	229.70	219.74
Vested, weighted average price per share (in dollars per share) | $ / shares	203.51	193.51	133.56
Outstanding at end of period, weighted average price per share (in dollars per share) | $ / shares	$ 226.31	$ 221.77	$ 213.45
Unearned unrecognized compensation | $	$ 45,000
Weighted average period to recognize (in years)	3 years
Minimum [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Minimum [Member] | Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Maximum [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	7 years
Maximum [Member] | Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	7 years

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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