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Income Taxes (Components Of The Net Deferred Income Tax Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Components of Deferred Tax Assets and Liabilities [Abstract]    
Property and Equipment $ 55,262 $ 98,654
Unremitted earnings of foreign subsidiaries 0 24,084
Investments in 50% or Less Owned Companies 4,258 15,203
Other 5,901 2,260
Total deferred tax liabilities 65,421 140,201
Federal net operating loss carryforwards 5,111 0
Other 5,373 15,256
Total deferred tax assets 10,484 15,256
Valuation allowance (569) 0
Deferred Tax Assets, Net of Valuation Allowance 9,915 15,256
Net deferred tax liabilities $ 55,506 $ 124,945