Summary Of Significant Accounting Policies (Inventory by Major Class) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Summary Of Significant Accounting Policies [Abstract]
Spare Parts Inventory	$ 1,930	$ 3,253
Fuel Inventory	2,854	3,967
Warehouse Inventory	2,251	2,540
Total	$ 7,035	$ 9,760