Fair Value of Financial Instruments - Fair Value (Table) (Details) - USD ($)
$ in Thousands |
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
| Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |
|
|
|
| Cash and cash equivalents - Book Value |
$ 137,882
|
$ 127,632
|
$ 135,992
|
| Cash and cash equivalents - Fair Value |
137,882
|
127,632
|
|
| Restricted cash - Book Value |
12,892
|
6,558
|
$ 5,386
|
| Restricted cash - Fair Value |
12,892
|
6,558
|
|
| Investments in available-for-sale securities - Book Value |
192
|
238
|
|
| Investments in available-for-sale securities - Fair Value |
192
|
238
|
|
| Loan receivable from affiliate companies - Book Value |
46,089
|
30,112
|
|
| Loan receivable from affiliate companies - Fair Value |
46,089
|
30,112
|
|
| Senior and ship mortgage notes, net - Book Value |
(1,272,108)
|
(1,301,999)
|
|
| Senior and ship mortgage notes, net - Fair Value |
(966,402)
|
(1,181,838)
|
|
| Long-term debt, including current portion - Book Value |
(543,899)
|
(380,489)
|
|
| Long-term debt, including current portion - Fair Value |
(549,078)
|
(389,332)
|
|
| Long-term payable to affiliate companies - Book Value |
(67,154)
|
(76,872)
|
|
| Long-term payable to affiliate companies - Fair Value |
$ (67,154)
|
$ (76,872)
|
|