Fair Value of Financial Instruments - Fair Value (Table) (Details) - USD ($)
$ in Thousands |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
| Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |
|
|
|
|
| Cash and cash equivalents - Book Value |
$ 135,992
|
$ 163,412
|
$ 247,556
|
$ 187,831
|
| Cash and cash equivalents - Fair Value |
135,992
|
163,412
|
|
|
| Restricted cash - Book Value |
5,386
|
13,480
|
$ 2,564
|
|
| Restricted cash - Fair Value |
5,386
|
13,480
|
|
|
| Investments in available-for-sale securities - Book Value |
0
|
5,173
|
|
|
| Investments in available-for-sale securities - Fair Value |
0
|
5,173
|
|
|
| Loan receivable from affiliate companies - Book Value |
23,008
|
16,474
|
|
|
| Loan receivable from affiliate companies - Fair Value |
23,008
|
16,474
|
|
|
| Long-term receivable from affiliate companies - Book Value |
11,105
|
0
|
|
|
| Long-term receivable from affiliate companies - Fair Value |
11,105
|
0
|
|
|
| Capital lease obligations, including current portion - Book Value |
(17,617)
|
(20,649)
|
|
|
| Capital lease obligations, including current portion - Fair Value |
(17,617)
|
(20,649)
|
|
|
| Senior and ship mortgage notes, net - Book Value |
(1,296,537)
|
(1,350,941)
|
|
|
| Senior and ship mortgage notes, net - Fair Value |
(974,170)
|
(735,002)
|
|
|
| Long-term debt, including current portion - Book Value |
(304,682)
|
(230,367)
|
|
|
| Long-term debt, including current portion - Fair Value |
(308,080)
|
(233,526)
|
|
|
| Loan payable to affiliate company - Book Value |
(49,876)
|
0
|
|
|
| Loan payable to affiliate company - Fair Value |
(51,240)
|
0
|
|
|
| Long-term payable to affiliate companies - Book Value |
(6,399)
|
0
|
|
|
| Long-term payable to affiliate companies - Fair Value |
$ (6,399)
|
$ 0
|
|
|