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FAIR VALUE MEASUREMENTS - Asset Unobservable Input Reconciliation (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Beginning Balance $ 1,973
Included in earnings 1,111
Included in other comprehensive income (1,910)
Purchases, sales, issuances and settlements (1,174)
Transfers in and out of Level 3 0
Ending Balance 0
The amount of total gains/(losses) for the period included in earnings (derivative income) attributable to the change in unrealized gain/(losses) relating to derivatives still held $ 0