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Asset Retirement Obligation (Schedule Of ARO Activity) (Detail) - Asset Retirement Obligation Costs [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Beginning balance $ 54,211 $ 59,380
Adjustment due to change in estimate of related costs 2,082 (5,391)
Accretion of liability 754 7,858
Liabilities settled (6,105) (5,802)
Foreign Currency (2,886) (1,834)
Ending balance $ 48,056 $ 54,211