FAIR VALUE MEASUREMENTS (Details) - Recurring basis $ in Thousands	Dec. 31, 2016 USD ($)
Carrying Amount
Liabilities:
Debt	$ 415,806
Amount of equity component of convertible notes	77,000
Fair Value
Assets:
Total assets	6,961
Liabilities:
Debt	393,865
Total liabilities	393,865
Level 1
Assets:
Total assets	4,176
Liabilities:
Debt	393,865
Total liabilities	393,865
Level 2
Assets:
Total assets	2,785
Marketable equity Securities | Carrying Amount
Assets:
Marketable equity securities	4,176
Marketable equity Securities | Fair Value
Assets:
Marketable equity securities	4,176
Marketable equity Securities | Level 1
Assets:
Marketable equity securities	4,176
Warrants | Carrying Amount
Assets:
Warrants	2,785
Warrants | Fair Value
Assets:
Warrants	2,785
Warrants | Level 2
Assets:
Warrants	$ 2,785