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Long-Term Debt - Maturities of Long-Term Debt (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | ---
Aug. 31, 2002 | Mar. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2012
Debt Instrument [Line Items] |  |  |  |
Less than one year |  | $ 71,786 |  |
One to two years |  | 72,090 |  |
Two to three years |  | 229,907 |  |
Three to four years |  | 42,741 |  |
Four to five years |  | 87,735 |  |
Over five years |  | 252,676 |  |
Total debt |  | 756,935 |  |
Current maturities |  | (71,786) | $ (71,640) |
Long-term debt, less current maturities |  | 685,149 |  |
Unamortized debt discount |  | (13,396) |  |
Unamortized debt issuance costs |  | (11,805) |  |
Long-term debt |  | 659,948 | 677,695 |
Term Loan Maturing June 2018 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Less than one year |  | 30,000 |  |
One to two years |  | 30,000 |  |
Two to three years |  | 187,500 |  |
Total debt |  | 247,500 | 255,000 |
Current maturities |  | (30,000) |  |
Long-term debt, less current maturities |  | 217,500 |  |
Unamortized debt issuance costs |  | (2,087) |  |
Long-term debt |  | 215,413 |  |
Convertible Senior Notes Maturing March 2032 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Over five years |  | 200,000 |  |
Total debt |  | 200,000 | 200,000 | $ 200,000
Long-term debt, less current maturities |  | 200,000 |  |
Unamortized debt discount |  | (13,396) | (15,000) | $ (35,400)
Unamortized debt issuance costs |  | (1,229) |  |
Long-term debt |  | $ 185,375 |  |
Maturity date |  | March 2032 |  |
MARAD Debt Maturing February 2027 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Less than one year |  | $ 6,072 |  |
One to two years |  | 6,375 |  |
Two to three years |  | 6,693 |  |
Three to four years |  | 7,027 |  |
Four to five years |  | 7,378 |  |
Over five years |  | 52,676 |  |
Total debt |  | 86,221 | 89,148 |
Current maturities |  | (6,072) |  |
Long-term debt, less current maturities |  | 80,149 |  |
Unamortized debt issuance costs |  | (5,367) |  |
Long-term debt |  | 74,782 |  |
Maturity date | February 2027 |  |  |
Nordea Q5000 Loan Maturing April 2020 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Less than one year |  | 35,714 |  |
One to two years |  | 35,715 |  |
Two to three years |  | 35,714 |  |
Three to four years |  | 35,714 |  |
Four to five years |  | 80,357 |  |
Total debt |  | 223,214 | $ 232,143 |
Current maturities |  | (35,714) |  |
Long-term debt, less current maturities |  | 187,500 |  |
Unamortized debt issuance costs |  | (3,122) |  |
Long-term debt |  | $ 184,378 |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount, after accumulated amortization, of debt issuance costs classified as noncurrent. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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