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) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents, Carrying Amount $ 433,827 $ 434,183 $ 453,415 $ 527,435
Investments, at cost, in 50% or less owned companies (included in other assets), Carrying Amount 10,442      
Notes receivable from other business ventures (included in other receivables and other assets), Carrying Amount 25,512      
Long-term debt, including current portion, Carrying Amount 924,593      
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 433,827      
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 985,610      
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      
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%