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Stockholders' Equity (Summary Of Certain Information With Respect To The Performance Share Awards) (Details) - Performance Shares [Member] - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Fair Value     $ 14,287  
Accrual     8,009  
Expense $ 1,367 $ 2,512 3,025 $ 3,633
January 1, 2018 - December 31, 2020 [Member]        
Fair Value     3,168  
Accrual     523  
Expense 279   523  
January 1, 2017 - December 31, 2019 [Member]        
Fair Value     5,298  
Accrual     2,642  
Expense 509 470 1,109 675
January 1, 2016 - December 31, 2018 [Member]        
Fair Value     5,821  
Accrual     4,844  
Expense $ 579 1,046 $ 1,393 1,355
January 1, 2015 - December 31, 2017 [Member]        
Expense   $ 996   $ 1,603