Fair Value (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Fair Value Measurements [Line Items]
Transfer between Level 2 and Level 3	$ 0		$ 0
Transfer between Level 1 and Level 2	0	$ 0	0	$ 0
Level 3
Fair Value Measurements [Line Items]
Liabilities held	0	$ 0	0	$ 0
Securities excluded due to lack of transparency	$ 400,000		$ 400,000