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STOCK-BASED COMPENSATION PLANS - Executive Equity Arrangements (Details) $ in Thousands								1 Months Ended				12 Months Ended
	Apr. 01, 2018 shares	Mar. 16, 2018 shares	Apr. 01, 2017 shares	Mar. 31, 2017 executive shares	Mar. 16, 2017 shares	Apr. 01, 2016 executive shares	Mar. 16, 2015 executive shares	Feb. 28, 2019 executive shares	May 31, 2018 shares	Mar. 31, 2018 executive shares	Feb. 28, 2017 shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2016 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation | $												$ 11,072	$ 25,657	$ 19,768
PSAs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation | $												$ 300
Granted (in shares)						131,250	131,250		195,000			207,350
Percent of performance metrics achieved									150.00%
Vested (in shares)												57,768
Executive granted shares | executive						6	8
Forfeited (in shares)												0
Unvested balance outstanding												210,416	60,834
Stock Bonus Election Program | 2018 Bonus Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Uplift percentage												20.00%
Stock Bonus Election Program | Uplift Shares and 2018 Bonus Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ratio multiplier												120.00%
Stock-based compensation | $												$ 1,100
2017 Performance Share Units | PSAs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)				165,000
Percent of performance metrics achieved										130.00%
Vested (in shares)										33,584
Executive granted shares | executive				5
Number of remaining executives holding grants | executive										3
2016 Performance Share Units | PSAs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of performance metrics achieved										130.00%	90.40%
Vested (in shares)										16,250	24,106
Number of remaining executives holding grants | executive										2
Forfeited (in shares)					2,560
Unvested balance outstanding												0
2015 Performance Share Units | PSAs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of performance metrics achieved										112.00%	76.00%
Vested (in shares)										7,934	23,750
Number of remaining executives holding grants | executive										2
Forfeited (in shares)			7,500
Unvested balance outstanding												0
March 31, 2017 | 2017 Performance Share Units | PSAs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of performance metrics achieved										100.00%
Vested (in shares)										25,834
March 31, 2018 | 2017 Performance Share Units | PSAs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested (in shares)										7,750
Percent achievement over target										30.00%
April 1, 2016 | 2016 Performance Share Units | PSAs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of performance metrics achieved										100.00%
Vested (in shares)										12,500
April 1, 2018 | 2016 Performance Share Units | PSAs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested (in shares)	3,750
Percent achievement over target	30.00%
March 16, 2015 | 2015 Performance Share Units | PSAs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of performance metrics achieved										100.00%
Vested (in shares)										7,084
March 16, 2018 | 2015 Performance Share Units | PSAs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested (in shares)		850
Percent achievement over target		12.00%
Minimum | Stock Bonus Election Program | 2018 Bonus Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of bonus available for program												10.00%
Maximum | Stock Bonus Election Program | 2018 Bonus Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of bonus available for program												50.00%
Subsequent Event | PSAs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of performance metrics achieved, level one								106.49%
Percent of performance metrics achieved, level two								150.00%
Vested (in shares)								250,075
Subsequent Event | 2017 Performance Share Units | PSAs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of performance metrics achieved								61.40%
Vested (in shares)								9,464
Number of remaining executives holding grants | executive								3

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