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Other Income (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Component of Operating Income [Abstract]      
Interest Income (Expense), Net $ 10,834 $ 9,530 $ 23,520
Equity in Earnings of Affiliates (36,059) (37,984) (45,059)
Contracts Revenue 6,288 0 30,000
Royalty Revenue 20,083 15,402 19,653
Right of Way Issuance 27,343 13,289 7,333
Interest Income, Other 1,507 2,299 2,303
Income (Loss) from Equity Method Investments 48,260 43,799 29,807
Other Nonoperating Income 6,357 9,354 20,772
Revenue, Coal Services 5,757 1,596 9,029
Proceeds from Divestiture of Businesses and Interests in Affiliates $ (4,818) $ (11,098) $ (19,984)