Fair Value of Financial Instruments - Fair Value (Table) (Details) - USD ($)
$ in Thousands |
Jun. 30, 2015 |
Dec. 31, 2014 |
Jun. 30, 2014 |
Dec. 31, 2013 |
| Financial Instruments Owned At Fair Value [Abstract] |
|
|
|
|
| Cash and cash equivalents - Book Value |
$ 180,366
|
$ 247,556
|
$ 232,435
|
$ 187,831
|
| Cash and cash equivalents - Fair Value |
180,366
|
247,556
|
|
|
| Restricted cash - Book Value |
906
|
2,564
|
$ 2,631
|
|
| Restricted cash - Fair Value |
906
|
2,564
|
|
|
| Investments in available-for-sale securities - Book Value |
6,261
|
6,701
|
|
|
| Investments in available-for-sale securities - Fair Value |
6,261
|
6,701
|
|
|
| Loan receivable from affiliate companies - Book Value |
11,464
|
7,791
|
|
|
| Loan receivable from affiliate companies - Fair Value |
11,464
|
7,791
|
|
|
| Long-term receivable from affiliate companies - Book Value |
0
|
9,625
|
|
|
| Long-term receivable from affiliate companies - Fair Value |
0
|
9,625
|
|
|
| Capital lease obligations, including current portion - Book Value |
(21,441)
|
(22,360)
|
|
|
| Capital lease obligations, including current portion - Fair Value |
(21,441)
|
(22,360)
|
|
|
| Senior and ship mortgage notes, net - Book Value |
(1,349,023)
|
(1,347,316)
|
|
|
| Senior and ship mortgage notes, net - Fair Value |
(1,206,689)
|
(1,300,021)
|
|
|
| Long-term debt, including current portion - Book Value |
(235,000)
|
(265,574)
|
|
|
| Long-term debt, including current portion - Fair Value |
$ (238,560)
|
$ (269,582)
|
|
|