OTHER INFORMATION - Components of Other Current Assets (Details) - USD ($) $ in Thousands |
Dec. 31, 2017 |
Dec. 31, 2016 |
|---|---|---|
| Other Income and Expenses [Abstract] | ||
| Inventory | $ 21,940 | $ 21,190 |
| Deposits | 1,720 | 1,445 |
| Other receivables | 4,906 | 9,302 |
| Restricted cash | 26,096 | 680 |
| Other | 4,052 | 6,582 |
| Total other current assets | $ 58,714 | $ 39,199 |