Annual report pursuant to Section 13 and 15(d)

Income Taxes (Components Of The Net Deferred Income Tax Liabilities) (Details)

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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 $ 92,127 $ 153,214
Long-term Debt 22,519 44,782
Unremitted earnings of foreign subsidiaries 0 179
Investments in 50% or Less Owned Companies 811 1,346
Intangible assets 1,006 1,908
Other 96 138
Total deferred tax liabilities 116,559 201,567
Share award plans 3,476 7,952
Losses on marketable securities 5,986 17,758
Deductible goodwill 312 1,611
Debt and equity issuance costs 406 7,638
Other 11,652 12,767
Total deferred tax assets 21,832 47,726
Valuation allowance 6,695 3,600
Net deferred tax assets 15,137 44,126
Net deferred tax liabilities $ 101,422 $ 157,441