Derivative Instruments - Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Derivative [Line Items] | |||
| Realized (losses) gains | $ (10,643) | $ (9,790) | $ (6,447) |
| Unrealized Gain (Loss) on Derivatives | 9,679 | 8,193 | 11,676 |
| Total realized and unrealized loss on derivatives | (964) | (1,597) | 5,229 |
| Interest Rate Swap Agreements [Member] | |||
| Derivative [Line Items] | |||
| Realized (losses) gains | (12,797) | (9,790) | (9,993) |
| Unrealized Gain (Loss) on Derivatives | 13,681 | 7,686 | 7,044 |
| Time-charter Swap Agreement [Member] | |||
| Derivative [Line Items] | |||
| Realized (losses) gains | 2,154 | 0 | 3,546 |
| Unrealized Gain (Loss) on Derivatives | 875 | 0 | 3,395 |
| Stock Purchase Warrant [Member] | |||
| Derivative [Line Items] | |||
| Unrealized Gain (Loss) on Derivatives | $ (4,877) | $ 507 | $ 1,237 |