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DEBT - 2015 Revolving Credit Facility (Details) $ in Thousands |  |  |  |  |  | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 07, 2016 USD ($) | Oct. 14, 2015 USD ($) | Jul. 10, 2015 USD ($) | Apr. 08, 2015 USD ($) | Apr. 07, 2015 USD ($) installment | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) | Dec. 31, 2015 USD ($)
Line of Credit Facility |  |  |  |  |  |  |  |
Debt classified as current liability |  |  |  |  |  |  | $ 553,301 | $ 579,023
Revolving Credit Facility | 2015 Revolving Credit Facility |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 59,500 |  |  |
Quarterly reduction of total amount committed |  |  |  |  | $ 1,641 |  |  |
Number of quarterly installments | installment |  |  |  |  | 20 |  |  |
Commitment fee on unused daily average unutilized commitment (as a percent) |  |  |  |  | 1.50% |  |  |
Period after agreement date for first periodic payment |  |  |  |  | 3 months |  |  |
Drawdowns during the period |  | $ 21,218 | $ 10,000 | $ 25,000 |  | $ 25,000 |  |
Long-term debt |  |  |  |  |  |  | 52,935 | $ 56,218
Debt classified as current liability |  |  |  |  |  |  | $ 52,935 |
Amount of amortization postponed from current due date | $ 1,641 |  |  |  |  |  |  |
Debt service required | $ 3,241 |  |  |  |  |  |  |
Revolving Credit Facility | 2015 Revolving Credit Facility | LIBOR |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |
Reference rate for interest payable |  |  |  |  | LIBOR |  |  |
Revolving Credit Facility | 2015 Revolving Credit Facility | Minimum | LIBOR |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |
Applicable margin over reference rate for interest payable |  |  |  |  | 3.40% |  |  |
Revolving Credit Facility | 2015 Revolving Credit Facility | Maximum | LIBOR |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |
Applicable margin over reference rate for interest payable |  |  |  |  | 4.25% |  |  |

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