SHARE REPURCHASE PROGRAM - Additional Information (Details)			12 Months Ended			111 Months Ended
	Jun. 10, 2016	May 27, 2016	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 shares	Dec. 31, 2014 shares	Dec. 31, 2016 shares	Sep. 24, 2007 USD ($)
Equity [Abstract]
Stock repurchase program authorized aggregate amount							$ 100,000,000
Shares repurchased during period (in shares) | shares			0	0	0	30,000
Stock repurchase program total cost			$ 7,071,000
Stock repurchase program average price (in usd per share) | $ / shares			$ 235.70
Stock split, conversion ratio	0.1	0.1	100.0