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, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and Cash Equivalents, at Carrying Value $ 22,517 $ 11,505 $ 9,232 $ 79,122
Notes receivable from other business ventures (included in other receivables and other assets) 642 925    
Long-term debt, including current portion, Carrying Amount 242,816 279,735    
Level 1 [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents, Estimated Fair Value 22,517 11,505    
Notes receivable from other business ventures (included in other receivables and other assets) 642 925    
Long-term debt, including current portion, Estimated Fair Value 0 0    
Level 2 [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents, Estimated Fair Value 0 0    
Notes receivable from other business ventures (included in other receivables and other assets) 0 0    
Long-term debt, including current portion, Estimated Fair Value 246,670 283,120    
Level 3 [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents, Estimated Fair Value 0 0    
Notes receivable from other business ventures (included in other receivables and other assets) 0 0    
Long-term debt, including current portion, Estimated Fair Value $ 0 $ 0