Derivative Instruments (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Net derivative assets	$ 14,500		$ 14,500		$ 45,000
Gains (Losses) on Fair Value Hedge Ineffectiveness, Net	$ 0	$ 0	$ 0	$ 0