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DEBT - Commitment Letter (Details) - USD ($) $ / shares in Units, $ in Thousands | Nov. 15, 2016 | Jun. 08, 2016 | Sep. 30, 2017 | Dec. 31, 2016 | Nov. 10, 2016 | Oct. 27, 2016 | Oct. 06, 2016 | Sep. 30, 2016 | Jun. 29, 2016 | Dec. 31, 2014 | Dec. 03, 2013 | Aug. 30, 2013 | Aug. 20, 2010 | Aug. 12, 2010
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Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share |  |  | $ 0.01 | $ 0.01 |  |  |  |  |  |  |  |  |  |
Series A Preferred Stock | John C. Wobensmith |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price (in dollars per share) |  |  |  |  |  | $ 4.85 |  |  |  |  |  |  |  |
Series A Preferred Stock | Other Investors, including John C. Wobensmith |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment to purchase convertible preferred stock |  |  |  |  |  | $ 38,600 |  |  |  |  |  |  |  |
Series A Preferred Stock | Private placement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price (in dollars per share) | $ 4.85 |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of stock (in shares) | 27,061,856 |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of stock excluding services (in shares) | 25,773,196 |  |  |  |  |  |  |  |  |  |  |  |  |
Additional shares issued as commitment fee (in shares) | 1,288,660 |  |  |  |  |  |  |  |  |  |  |  |  |
Second Amended Commitment Letter |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share |  |  |  |  |  |  | $ 0.01 |  |  |  |  |  |  |
Second Amended Commitment Letter | Series A Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price (in dollars per share) |  |  |  |  |  |  | $ 4.85 |  |  |  |  |  |  |
Commitment of shares to be purchased |  |  |  |  |  |  | 1,288,660 |  |  |  |  |  |  |
Commitment Letter |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 400,000 |  |  |  |  |  |  |  |  |  |  |  |
Minimum | Amended Commitment Letter |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum cash requirement through the end of the waiver period |  |  |  |  |  |  |  |  | $ 25,000 |  |  |  |  |
Maximum | Amended Commitment Letter |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum cash withdrawal under covenant |  |  |  |  |  |  | $ 10,000 |  |  |  |  |  |  |
Reduction of cash under covenants (per vessel) |  |  |  |  |  |  | 250 |  |  |  |  |  |  |
Maximum | Second Amended Commitment Letter | Series A Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Financing |  |  |  |  |  |  | $ 125,000 |  |  |  |  |  |  |
Centerbridge Partners L.P | Firm Commitment | Series A Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment of shares to be purchased |  |  |  |  |  |  | 6,597,938 |  |  |  |  |  |  |
Commitment to purchase convertible preferred stock |  |  |  |  |  |  | $ 32,000 |  |  |  |  |  |  |
Centerbridge Partners L.P | Backstop Commitment | Series A Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment of shares to be purchased |  |  |  |  |  |  | 3,402,062 |  |  |  |  |  |  |
Centerbridge Partners L.P | Commitment Letter |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity financing to be provided by each equity commitment |  | 31,200 |  |  |  |  |  |  |  |  |  |  |  |
Strategic Value Partners LLC | Firm Commitment | Series A Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment of shares to be purchased |  |  |  |  |  |  | 7,628,866 |  |  |  |  |  |  |
Commitment to purchase convertible preferred stock |  |  |  |  |  |  | $ 37,000 |  |  |  |  |  |  |
Strategic Value Partners LLC | Backstop Commitment | Series A Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment of shares to be purchased |  |  |  |  |  |  | 2,371,134 |  |  |  |  |  |  |
Strategic Value Partners LLC | Commitment Letter |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity financing to be provided by each equity commitment |  | 17,300 |  |  |  |  |  |  |  |  |  |  |  |
Apollo Global Management LLC | Firm Commitment | Series A Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment of shares to be purchased |  |  |  |  |  |  | 3,587,629 |  |  |  |  |  |  |
Commitment to purchase convertible preferred stock |  |  |  |  |  |  | $ 17,400 |  |  |  |  |  |  |
Apollo Global Management LLC | Backstop Commitment | Series A Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment of shares to be purchased |  |  |  |  |  |  | 2,185,568 |  |  |  |  |  |  |
Apollo Global Management LLC | Commitment Letter |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity financing to be provided by each equity commitment |  | $ 14,000 |  |  |  |  |  |  |  |  |  |  |  |
Secured Debt | $100 Million Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  | $ 100,000 |  |  |  |  |  | $ 100,000
Secured Debt | $22 Million Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  | 22,000 |  |  |  | $ 22,000 |  |
Secured Debt | $253 Million Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  | 253,000 |  |  |  |  | $ 253,000 |
Secured Debt | $400 Million Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 400,000 | $ 400,000 | $ 400,000 |  |  |  |  |  |  |  |  |
Secured Debt | $44 Million Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  | 44,000 |  |  | $ 44,000 |  |  |
Line of Credit Facility | $148 Million Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  | $ 148,000 |  | $ 148,000 |  |  |  |

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