OTHER CURRENT ASSETS Narrative (Details) $ in Thousands |
3 Months Ended | 12 Months Ended | ||||
|---|---|---|---|---|---|---|
|
Feb. 22, 2017
USD ($)
|
Dec. 31, 2016
USD ($)
|
Dec. 31, 2017
USD ($)
|
Dec. 31, 2016
USD ($)
|
Dec. 31, 2015
USD ($)
|
Feb. 26, 2014
USD ($)
|
|
| Financing Receivable, Impaired [Line Items] | ||||||
| Cash collection on Axeon Term Loan | $ 110,000 | $ 0 | $ 0 | |||
| Impairment loss on Axeon Term Loan | $ 58,700 | 0 | 58,655 | $ 0 | ||
| Axeon [Member] | ||||||
| Financing Receivable, Impaired [Line Items] | ||||||
| Cash collection on Axeon Term Loan | $ 110,000 | |||||
| Impairment loss on Axeon Term Loan | 58,700 | |||||
| Carrying amount, Axeon Term Loan | 110,000 | $ 0 | 110,000 | |||
| Maximum Amount Guarantees | 125,000 | 125,000 | ||||
| Axeon Term Loan Receivable | $ 190,000 | |||||
| Axeon [Member] | Financial Guarantee [Member] | ||||||
| Financing Receivable, Impaired [Line Items] | ||||||
| Amount of guarantees provided | $ 54,100 | $ 54,100 | ||||
| Number of guarantees with unlimited exposure | 1 | 1 | ||||