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Notes Payable and Revolving Line of Credit (Schedule Of Notes Payable And Revolving Line Of Credit) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Notes Payable and Revolving Line of Credit [Abstract]    
6.875% senior notes $ 378,531 $ 253,089
Revolving line of credit 65,000 195,000
Insurance premium notes 4,417 5,999
Total notes payable and revolving line of credit (Carrying amount) $ 447,948 $ 454,088