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Stockholders' Equity (Details) (USD $)
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12 Months Ended |
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Dec. 31, 2014
item
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Dec. 31, 2013
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Dec. 31, 2011
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Sep. 18, 2009
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| Stockholders' Equity |
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| Shares issued |
109,669,429 |
109,653,363 |
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| Shares outstanding |
109,669,429 |
109,653,363 |
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| Authorized capital stock, common stock (in shares) |
750,000,000 |
750,000,000 |
|
750,000,000 |
| Authorized capital stock, par value of common stock (in dollars per share) |
$ 0.01 |
0.01 |
|
$ 0.01 |
| Authorized capital stock, preferred stock (in shares) |
100,000,000 |
100,000,000 |
|
100,000,000 |
| Authorized capital stock, par value of preferred stock (in dollars per share) |
$ 0.01 |
0.01 |
|
$ 0.01 |
| Stockholders' equity |
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|
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| Maximum consolidated net leverage ratio set as condition for payment of cash dividends and repurchase of shares |
6 |
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| Number of consecutive quarters considered for calculation of consolidated net leverage ratio |
4 |
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| Ratio of aggregate market value of vessels to outstanding indebtedness (as a percent) |
125.00% |
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| Number of consecutive quarters considered for calculation of ratio of aggregate market value of vessels to outstanding indebtedness |
4 |
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| Number of warrants issued to lenders |
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15,000,000 |
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| Exercise price of warrant (in dollars per share) |
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|
7.00 |
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| Manager's employees, directors and employees of the Company |
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| Stockholders' equity |
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| Newly issued shares |
16,066 |
49,323 |
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