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
Sep. 30, 2016
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Cash and cash equivalents, Carrying Amount $ 474,544
Investments, at cost, in 50% or less owned companies (included in other assets), Carrying Amount 9,545
Notes receivable from other business ventures (included in other receivables and other assets), Carrying Amount 24,723
Long-term debt, including current portion, Carrying Amount 1,041,919
Fair Value, Inputs, Level 1 [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Cash and cash equivalents, Carrying Amount 474,544
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, Carrying Amount 0
Debt Instrument, Fair Value Disclosure 1,047,546
Fair Value, Inputs, Level 3 [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Cash and cash equivalents, Carrying Amount 0
Debt Instrument, Fair Value Disclosure $ 0
Two Point Five Percentage Convertible Notes [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Debt Instrument, Interest Rate, Stated Percentage 2.50%
Three Point Zero Percentage Convertible Notes [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Debt Instrument, Interest Rate, Stated Percentage 3.00%