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Other Assets (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Debt issuance costs, net of amortization $ 59,562 $ 61,923
Investments 12,030 13,708
Deferred tax asset 6,987 0
Restricted deposits(1) 0 [1] 27,955 [1]
Notes receivable on asset retirement obligations(1) 0 [1] 11,640 [1]
Other 3,459 5,945
Total other assets $ 82,038 $ 121,171
[1] Assets reflected at December 31, 2013 were included in the sale of the Gulf Properties in February 2014, as discussed in Note 2.