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Other Assets (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |  |  |
Debt issuance costs, net of amortization | $ 56,445 us-gaap_DeferredFinanceCostsNoncurrentNet | [1] | $ 61,923 us-gaap_DeferredFinanceCostsNoncurrentNet | [1]
Deferred tax asset | 95,843 us-gaap_DeferredTaxAssetsGrossNoncurrent |  | 0 us-gaap_DeferredTaxAssetsGrossNoncurrent |
Restricted deposits | 0 us-gaap_RestrictedCashAndInvestmentsNoncurrent | [2] | 27,955 us-gaap_RestrictedCashAndInvestmentsNoncurrent | [2]
Notes receivable on asset retirement obligations | 0 us-gaap_NotesAndLoansReceivableNetNoncurrent | [2] | 11,640 us-gaap_NotesAndLoansReceivableNetNoncurrent | [2]
Investments | 11,106 us-gaap_MarketableSecuritiesNoncurrent |  | 13,708 us-gaap_MarketableSecuritiesNoncurrent |
Other | 1,853 us-gaap_OtherAssetsMiscellaneousNoncurrent |  | 5,945 us-gaap_OtherAssetsMiscellaneousNoncurrent |
Total other assets | $ 165,247 us-gaap_OtherAssetsNoncurrent |  | $ 121,171 us-gaap_OtherAssetsNoncurrent |
[1] | Unamortized debt issuance costs associated with the 9.875% Senior Notes due 2016 and 8.0% Senior Notes due 2018 were written off in March 2013 when the Company redeemed these notes. See Note 12 for discussion of the senior note redemptions.
[2] | Assets at December 31, 2013 were included in the sale of the Gulf Properties in February 2014, as discussed in Note 3.

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- Definition Net amount of long-term deferred finance costs capitalized at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards expected to be realized or consumed after one year (or the normal operating cycle, if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31917-109318 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31931-109318 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Asset -URI http://asc.fasb.org/extlink&oid=6510090 + Details
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