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Summary Of Significant Accounting Policies - Recertification Costs And Deferred Dry Dock Costs (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items] |  |  |
Deferred dry dock costs, net (Note 2) | $ 14,766 | $ 19,615 |
Accumulated amortization deferred dry dock | 10,700 | 18,300 |
Dry dock amortization expense | $ 14,000 | $ 10,800 | $ 14,100
Minimum [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Dry dock amortization period | 30 months |  |
Dry dock recertification process period | 1 month |  |
Maximum [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Dry dock amortization period | 60 months |  |
Dry dock recertification process period | 2 months |  |

X
- Definition Carrying amount of accumulated amortization of deferred dry dock costs at the end of the reporting period + References No definition available. + Details
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- Definition Deferred Dry Dock Costs, Net + References No definition available. + Details
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X
- Definition Expense related to amortization of deferred dry dock costs + References No definition available. + Details
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Balance Type: | debit
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X
- Definition The length of time in which the deferred dry dock costs are amortized. + References No definition available. + Details
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- Definition The length of time to complete the dry dock and recertification process. + References No definition available. + Details
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