Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Estimated Fair Value Of Other Financial Assets And Liabilities) (Details)

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Fair Value Measurements (Estimated Fair Value Of Other Financial Assets And Liabilities) (Details)
$ in Thousands
Jun. 30, 2017
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Cash, cash equivalents and restricted cash $ 152,782
Investments, at cost, in 50% or less owned companies (included in other assets), Carrying Amount 132
Long-term debt, including current portion, Carrying Amount 315,497
Fair Value, Inputs, Level 1 [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Cash and Cash Equivalents, Fair Value Disclosure 152,782
Debt Instrument, Fair Value Disclosure 0
Fair Value, Inputs, Level 2 [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Cash and Cash Equivalents, Fair Value Disclosure 0
Debt Instrument, Fair Value Disclosure 283,893
Fair Value, Inputs, Level 3 [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Cash and Cash Equivalents, Fair Value Disclosure 0
Debt Instrument, Fair Value Disclosure $ 0