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Long-Term Debt - Maturities Of Long-Term Debt (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2017 | Aug. 31, 2002 | Sep. 30, 2017 | Dec. 31, 2016 | Nov. 01, 2016 | Mar. 31, 2012
Debt Instrument [Line Items] |  |  |  |  |  |
Less than one year |  |  | $ 108,611 |  |  |
One to two years |  |  | 53,822 |  |  |
Two to three years |  |  | 186,665 |  |  |
Three to four years |  |  | 7,560 |  |  |
Four to five years |  |  | 132,937 |  |  |
Over five years |  |  | 40,913 |  |  |
Total debt |  |  | 530,508 |  |  |
Current maturities |  |  | (108,611) | $ (67,571) |  |
Long-term debt, less current maturities |  |  | 421,897 |  |  |
Unamortized debt discount |  |  | (15,607) |  |  |
Unamortized debt issuance costs |  |  | (10,945) |  |  |
Long-term debt |  |  | 395,345 | 558,396 |  |
Term Loan Maturing June 2020 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Less than one year |  |  | 6,250 |  |  |
One to two years |  |  | 11,250 |  |  |
Two to three years |  |  | 81,250 |  |  |
Three to four years |  |  | 0 |  |  |
Four to five years |  |  | 0 |  |  |
Over five years |  |  | 0 |  |  |
Total debt | $ 100,000 |  | 98,750 | 0 |  |
Current maturities |  |  | (6,250) |  |  |
Long-term debt, less current maturities |  |  | 92,500 |  |  |
Unamortized debt discount |  |  | 0 |  |  |
Unamortized debt issuance costs |  |  | (1,815) |  |  |
Long-term debt |  |  | 90,685 |  |  |
Maturity date | June 2020 |  |  |  |  |
Convertible Senior Notes Maturing May 2022 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Less than one year |  |  | 0 |  |  |
One to two years |  |  | 0 |  |  |
Two to three years |  |  | 0 |  |  |
Three to four years |  |  | 0 |  |  |
Four to five years |  |  | 125,000 |  |  |
Over five years |  |  | 0 |  |  |
Total debt |  |  | 125,000 | 125,000 | $ 125,000 |
Current maturities |  |  | 0 |  |  |
Long-term debt, less current maturities |  |  | 125,000 |  |  |
Unamortized debt discount |  |  | (14,555) | (16,500) | $ (16,900) |
Unamortized debt issuance costs |  |  | (2,427) |  |  |
Long-term debt |  |  | $ 108,018 |  |  |
Maturity date |  |  | May 2022 |  |  |
Convertible Senior Notes Maturing March 2032 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Less than one year |  |  | $ 60,115 |  |  |
One to two years |  |  | 0 |  |  |
Two to three years |  |  | 0 |  |  |
Three to four years |  |  | 0 |  |  |
Four to five years |  |  | 0 |  |  |
Over five years |  |  | 0 |  |  |
Total debt |  |  | 60,115 | 60,115 |  | $ 200,000
Current maturities |  |  | (60,115) |  |  |
Long-term debt, less current maturities |  |  | 0 |  |  |
Unamortized debt discount |  |  | (1,052) | (2,600) |  | $ (35,400)
Unamortized debt issuance costs |  |  | (92) |  |  |
Long-term debt |  |  | $ (1,144) |  |  |
Earliest put date |  |  | March 2018 |  |  |
MARAD Debt Maturing February 2027 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Less than one year |  |  | $ 6,532 |  |  |
One to two years |  |  | 6,858 |  |  |
Two to three years |  |  | 7,200 |  |  |
Three to four years |  |  | 7,560 |  |  |
Four to five years |  |  | 7,937 |  |  |
Over five years |  |  | 40,913 |  |  |
Total debt |  |  | 77,000 | 83,222 |  |
Current maturities |  |  | (6,532) |  |  |
Long-term debt, less current maturities |  |  | 70,468 |  |  |
Unamortized debt discount |  |  | 0 |  |  |
Unamortized debt issuance costs |  |  | (4,635) |  |  |
Long-term debt |  |  | 65,833 |  |  |
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 |  |  | 35,714 |  |  |
Two to three years |  |  | 98,215 |  |  |
Three to four years |  |  | 0 |  |  |
Four to five years |  |  | 0 |  |  |
Over five years |  |  | 0 |  |  |
Total debt |  |  | 169,643 | $ 196,429 |  |
Current maturities |  |  | (35,714) |  |  |
Long-term debt, less current maturities |  |  | 133,929 |  |  |
Unamortized debt discount |  |  | 0 |  |  |
Unamortized debt issuance costs |  |  | (1,976) |  |  |
Long-term debt |  |  | $ 131,953 |  |  |

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