Derivatives (Fair Value Of Derivative Instruments And Locations In Balance Sheets) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Current derivative asset	$ 0	$ 10,186
Non-current derivative asset	0	968
Total derivatives assets	0	11,154
Current derivative liability	9,646	0
Non-current derivative liability	3,420	285
Total derivative liabilities	$ 13,066	$ 285