LEASES - Additional Disclosures (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) property Capital_lease	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Operating Leased Assets [Line Items]
Operating leases, rent expense	$ 4,540	$ 4,048	$ 2,818
Number of properties leased from related parties (in number of leases) | property	2
Number of capital leases | Capital_lease	2
Capital lease obligations, noncurrent	$ 5,752	5,972
Related Party
Operating Leased Assets [Line Items]
Operating leases, rent expense		$ 381	$ 755