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Other Assets (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Debt issuance costs, net of amortization(1) $ 61,923 [1] $ 83,643 [1]
Restricted deposits 27,955 27,947
Notes receivable on asset retirement obligations 11,640 11,433
Investments 13,708 10,348
Other 5,945 10,881
Total other assets $ 121,171 $ 144,252
[1] In 2013, the unamortized debt issuance costs associated with the 9.875% Senior Notes due 2016 and 8.0% Senior Notes due 2018 were written off at the time the Company redeemed these notes. See Note 12 for discussion of the senior note redemptions.