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Long-Term Debt - Maturities Of Long-Term Debt (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2016 | Nov. 01, 2016 | Mar. 31, 2012
Debt Instrument [Line Items] |  |  |  |  |
Less than one year | $ 109,861 |  |  |  |
One to two years | 55,072 |  |  |  |
Two to three years | 173,986 |  |  |  |
Three to four years | 7,560 |  |  |  |
Four to five years | 132,937 |  |  |  |
Over five years | 40,913 |  |  |  |
Total debt | 520,329 |  |  |  |
Less current maturities | (109,861) |  | $ (67,571) |  |
Long-term debt, less current maturities | 410,468 |  |  |  |
Unamortized debt discounts | (14,406) |  | (19,094) |  |
Unamortized debt issuance costs | (10,296) |  | (11,963) |  |
Long-term debt | 385,766 |  | 558,396 |  |
Term Loan Maturing June 2020 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Less than one year | 7,500 |  |  |  |
One to two years | 12,500 |  |  |  |
Two to three years | 77,500 |  |  |  |
Three to four years | 0 |  |  |  |
Four to five years | 0 |  |  |  |
Over five years | 0 |  |  |  |
Total debt | 97,500 | $ 100,000 | 0 |  |
Less current maturities | (7,500) |  |  |  |
Long-term debt, less current maturities | 90,000 |  |  |  |
Unamortized debt discounts | 0 |  |  |  |
Unamortized debt issuance costs | (1,658) |  |  |  |
Long-term debt | 88,342 |  |  |  |
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 |
Less current maturities | 0 |  |  |  |
Long-term debt, less current maturities | 125,000 |  |  |  |
Unamortized debt discounts | (13,876) |  | (16,500) | $ (16,900) |
Unamortized debt issuance costs | (2,295) |  |  |  |
Long-term debt | 108,829 |  |  |  |
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
Less current maturities | (60,115) |  |  |  |
Long-term debt, less current maturities | 0 |  |  |  |
Unamortized debt discounts | (530) |  | (2,600) |  | $ (35,400)
Unamortized debt issuance costs | (46) |  |  |  |
Long-term debt | $ (576) |  |  |  |
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 |  |
Less current maturities | (6,532) |  |  |  |
Long-term debt, less current maturities | 70,468 |  |  |  |
Unamortized debt discounts | 0 |  |  |  |
Unamortized debt issuance costs | (4,513) |  |  |  |
Long-term debt | 65,955 |  |  |  |
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 | 89,286 |  |  |  |
Three to four years | 0 |  |  |  |
Four to five years | 0 |  |  |  |
Over five years | 0 |  |  |  |
Total debt | 160,714 |  | $ 196,429 |  |
Less current maturities | (35,714) |  |  |  |
Long-term debt, less current maturities | 125,000 |  |  |  |
Unamortized debt discounts | 0 |  |  |  |
Unamortized debt issuance costs | (1,784) |  |  |  |
Long-term debt | $ 123,216 |  |  |  |

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