Gain On Sale Of Assets (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Gain On Sale of Assets [Abstract]      
Gain on Conveyances $ 2.6 $ 5.3  
Deferred Gains On Conveyances $ 5.5   $ 8.1