| **Accrued Liabilities and Deferred Credits** | 6 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
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| **Payables and Accruals [Abstract]**         |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| Accrued Liabilities and Deferred Credits     | Accrued Liabilities and Deferred CreditsAccrued liabilities and deferred credits consist of the following: June 30, 2013 December 31,2012Accrued compensation$2,442 $3,529Deferred revenue30,286 27,962Environmental and insurance liabilities1,541 1,621Other accrued liabilities16,354 9,240Total accrued liabilities and deferred credits$50,623 $42,352Deferred revenue at June 30, 2013 and December 31, 2012 includes $23.5 million related to a 2006 sale of approximately 3,900 acres of rural land to the Florida Department of Transportation. Revenue is recognized when title to a specific parcel is legally transferred. As of June 30, 2013, 1,595 acres remained to be transferred. |

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| - Definition
Accrued Liabilities And Deferred Credits.
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No definition available.
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