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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2017
Fair Value Disclosures [Abstract] |
Schedule of other financial instruments measured at fair value on a recurring basis | The following tables provide additional information relating to those financial instruments measured at fair value on a recurring basis (in thousands):
| Fair Value Measurements at December 31, 2017 Using |  |  |  | Valuation Approach
| Level 1 |  | Level 2 |  | Level 3 |  | Total |
Assets: |  |  |  |  |  |  |  |  |
Note receivable | $ | — |  |  | $ | 3,758 |  |  | $ | — |  |  | $ | 3,758 |  |  | (c)
Interest rate swaps | — |  |  | 966 |  |  | — |  |  | 966 |  |  | (c)
Liabilities: |  |  |  |  |  |  |  |  |
Foreign exchange contracts | — |  |  | 12,467 |  |  | — |  |  | 12,467 |  |  | (c)
Total net liability | $ | — |  |  | $ | 7,743 |  |  | $ | — |  |  | $ | 7,743 |  |  |
| Fair Value Measurements at December 31, 2016 Using |  |  |  | Valuation Approach
| Level 1 |  | Level 2 |  | Level 3 |  | Total |
Assets: |  |  |  |  |  |  |  |  |
Interest rate swaps | $ | — |  |  | $ | 451 |  |  | $ | — |  |  | $ | 451 |  |  | (c)
Liabilities: |  |  |  |  |  |  |  |  |
Foreign exchange contracts | — |  |  | 38,170 |  |  | — |  |  | 38,170 |  |  | (c)
Interest rate swaps | — |  |  | 751 |  |  | — |  |  | 751 |  |  | (c)
Total net liability | $ | — |  |  | $ | 38,470 |  |  | $ | — |  |  | $ | 38,470 |  |  |
Schedule of carrying values and estimated fair values of long-term debt | The carrying values and estimated fair values of our long-term debt are as follows (in thousands):
| December 31,
| 2017 |  | 2016
| Carrying Value (1) |  | Fair Value (2) |  | Carrying Value (1) |  | Fair Value (2)
Former term loan (was scheduled to mature June 2018) | $ | — |  |  | $ | — |  |  | $ | 192,258 |  |  | $ | 192,258 |
Term Loan (matures April 2020) | 97,500 |  |  | 98,231 |  |  | — |  |  | — |
Nordea Q5000 Loan (matures April 2020) | 160,714 |  |  | 160,111 |  |  | 196,429 |  |  | 192,746 |
MARAD Debt (matures February 2027) | 77,000 |  |  | 82,058 |  |  | 83,222 |  |  | 92,049 |
2022 Notes (mature May 2022) | 125,000 |  |  | 124,219 |  |  | 125,000 |  |  | 130,156 |
2032 Notes (mature March 2032) | 60,115 |  |  | 60,040 |  |  | 60,115 |  |  | 59,965 |
Total debt | $ | 520,329 |  |  | $ | 524,659 |  |  | $ | 657,024 |  |  | $ | 667,174 |
(1) | Carrying value includes current maturities and excludes the related unamortized debt discount and debt issuance costs. See Note 6 for additional disclosures on our long-term debt.
(2) | The estimated fair value of the 2022 Notes and the 2032 Notes was determined using Level 1 inputs under the market approach. The fair value of the Nordea Q5000 Loan, the MARAD Debt, the Term Loan, and our previous term loan that was scheduled to mature June 2018 was estimated using Level 2 fair value inputs under the market approach, which was determined using a third party evaluation of the remaining average life and outstanding principal balance of the indebtedness as compared to other obligations in the marketplace with similar terms.

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- Definition Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements. + References No definition available. + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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