STOCK-BASED COMPENSATION AND EMPLOYEE BENEFIT PLANS - Employee Stock Purchase Plan (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Apr. 01, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation, shares authorized (in shares)	15,825,223
Percentage of compensation eligible employees can use to purchase common stock, maximum	15.00%		15.00%		15.00%
Compensation amount that eligible employees can use to purchase common stock	$ 25,000		$ 25,000		$ 25,000
Percentage of fair market value eligible employees can purchase common stock as defined, minimum	85.00%		85.00%		85.00%
Proceeds from employee common stock purchases	$ 1,330,000		$ 1,114,000		$ 1,131,000
Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation, shares authorized (in shares)	2,321,688
Employee stock purchase plan, shares purchased (in shares)		86,998		74,976		75,328
Employee stock purchase plan, per share price (in usd per share)		$ 15.29		$ 14.86		$ 15.02	$ 20.20
Proceeds from employee common stock purchases		$ 1,300,000		$ 1,100,000		$ 1,100,000