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Significant Accounting Policies (Details 2) (USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
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12 Months Ended |
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Dec. 31, 2014
item
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Dec. 31, 2013
item
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Dec. 31, 2012
item
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Dec. 31, 2011
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| Foreign Currency Translation: |
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| Foreign currency exchange gains |
$ 300,000 |
$ 40,000 |
$ 20,000 |
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| Cash and Cash Equivalents: |
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| Cash and cash equivalents |
57,730,000 |
68,153,000 |
55,628,000 |
51,362,000 |
| Restricted Cash: |
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| Proportion of quarterly principal installments equal to the monthly deposit amount required for retention |
0.3333 |
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| Proportion of semi-annual interest installments equal to the monthly deposit amount required for retention |
0.1667 |
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| Impairment of Long-lived Assets: |
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| Impairment loss |
75,776,000 |
19,004,000 |
129,630,000 |
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| Number of vessels sold |
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7 |
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| Vessel Operating Expenses: |
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| Number of containerships chartered under multi-year and short-term time charters for which the company pays vessel operating expenses |
54 |
57 |
62 |
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| Number of containerships chartered under multi-year and short-term time charters for which charterers bear vessel operating expenses |
2 |
2 |
2 |
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| Segment Reporting: |
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| Number of operating segments |
1 |
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| Number of reportable segments |
1 |
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| Earnings/(Loss) Per Share: |
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| Other dilutive or potentially dilutive securities |
0 |
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| Difference between basic and diluted net income per share (in dollars per share) |
$ 0.00 |
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| Equity Compensation Plan: |
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| Maximum number of shares that may be issued as a proportion of outstanding capital stock |
6.00% |
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| Period of automatic termination from approval of plan by stockholders |
10 years |
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| Vessel |
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| Fixed Assets and Depreciation: |
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| Estimated useful life from the year built |
30 years |
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| Deferral and amortization period of survey and drydocking costs |
2 years 6 months |
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| Impairment of Long-lived Assets: |
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| Impairment loss |
$ (75,776,000) |
$ 0 |
$ 129,600,000 |
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| Number of vessels on which impairment loss is recorded |
8 |
0 |
13 |
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| Vessel | Minimum |
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| Impairment of Long-lived Assets: |
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| Term of multi-year fixed rate period charters for vessels in current fleet and contracted vessels |
1 year |
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| Vessel | Maximum |
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| Pension and Retirement Benefit Obligations Crew: |
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| On board period of crew under the short-term contracts |
7 months |
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| Impairment of Long-lived Assets: |
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| Term of multi-year fixed rate period charters for vessels in current fleet and contracted vessels |
18 years |
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