FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Jun. 15, 2015
Liabilities:
Convertible Notes, Carrying Value	$ 100,126	$ 95,950
Fair Value, Measurements, Recurring [Member]
Financial Assets:
Deferred compensation assets	2,035	3,617
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Financial Assets:
Deferred compensation assets	495	572
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Financial Assets:
Deferred compensation assets	1,540	3,045
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Financial Assets:
Deferred compensation assets	0	$ 0
Convertible Debt [Member]
Liabilities:
Convertible Notes, Carrying Value			$ 96,700
Convertible Notes, Fair Value Disclosure	$ 104,700