FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Jun. 15, 2015
Liabilities:
Convertible Notes, Carrying Value	$ 98,696	$ 95,950
Fair Value, Measurements, Recurring [Member]
Financial Assets:
Deferred compensation assets	2,641	3,617
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Financial Assets:
Deferred compensation assets	474	572
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Financial Assets:
Deferred compensation assets	2,167	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	$ 87,500