STOCK-BASED COMPENSATION, Stock Options (Details) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Stock Options [Member]
Stock option activity [Roll Forward]
Outstanding at January 1 (in shares)	384,435
Granted (in shares)	0	0	0
Exercised (in shares)	(367,935)
Forfeited (in shares)	0
Cancelled (in shares)	0
Outstanding at December 31 (in shares)	16,500	384,435
Stock option activity, additional disclosures [Abstract]
Outstanding at January 1, Weighted average exercise price (in dollars per share)	$ 10.52
Granted, Weighted average exercise price (in dollars per share)	0.00
Exercised, Weighted average exercise price (in dollars per share)	10.33
Forfeited, Weighted average exercise price (in dollars per share)	0.00
Cancelled, Weighted average exercise price (in dollars per share)	0.00
Outstanding at December 31, Weighted average exercise price (in dollars per share)	$ 14.83	$ 10.52
Stock option activity, vested and expected to vest [Abstract]
Vested and expected to vest (in shares)	16,500
Exercisable at December 31 (in shares)	16,500
Vested and expected to vest, Weighted average exercise price (in dollars per share)	$ 14.83
Exercisable, Weighted average exercise price (in dollars per share)	$ 14.83
Stock Options [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option expiration period	10 years
Equity Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)	10,500,000
Number of shares available for grant (in shares)	2,807,928