Fair Value of Financial Instruments - Fair Value (Table) (Details) - USD ($)
$ in Thousands |
Jun. 30, 2019 |
Dec. 31, 2018 |
Jun. 30, 2018 |
| Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |
|
|
|
| Cash and cash equivalents - Book Value |
$ 110,645
|
$ 137,882
|
$ 118,454
|
| Cash and cash equivalents - Fair Value |
110,645
|
137,882
|
|
| Restricted cash - Book Value |
11,431
|
12,892
|
$ 2,978
|
| Restricted cash - Fair Value |
11,431
|
12,892
|
|
| Investments in available-for-sale-securities - Book Value |
193
|
192
|
|
| Investments in available-for-sale-securities - Fair Value |
193
|
192
|
|
| Loan receivable from affiliate companies - Book Value |
51,823
|
46,089
|
|
| Loan receivable from affiliate companies - Fair Value |
51,823
|
46,089
|
|
| Senior and ship mortgage notes, net - Book Value |
(1,237,470)
|
(1,272,108)
|
|
| Senior and ship mortgage notes, net - Fair Value |
(976,756)
|
(966,402)
|
|
| Long-term debt, including current portion - Book Value |
(553,335)
|
(543,899)
|
|
| Long-term debt, including current portion - Fair Value |
(559,164)
|
(549,078)
|
|
| Long-term payable to affiliate companies - Book Value |
(96,750)
|
(67,154)
|
|
| Long-term payable to affiliate companies - Fair Value |
$ (96,750)
|
$ (67,154)
|
|