| **Accrued Liabilities and Deferred Credits (Tables)** | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
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| **Payables and Accruals [Abstract]**                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
| Accrued Liabilities and Deferred Credits              | Accrued liabilities and deferred credits consist of the following: December 31, 2014 December 31,2013Accrued compensation$2,673 $3,705Deferred revenue15,309 28,551Environmental and insurance liabilities475 1,071Membership deposits8,426 8,545Other accrued liabilities5,176 7,775Accrued interest expense for Senior Notes held by special purpose entity (Note 5)2,852 —Total accrued liabilities and deferred credits$34,911 $49,647 |

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| - Definition
Accrued Liabilities And Deferred Credits.
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