Fair Value Of Financial Instruments (Narrative) (Details)	3 Months Ended	9 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2017 USD ($)
Fair Value Disclosures [Abstract]
Transfers of financial assets from Level 2 to Level 1		$ 1,100,000
Transfers of financial assets from Level 1 to Level 2	$ 100,000	4,500,000
Transfers, Into Level 3		0
Transfers, out of Level 3, assets	$ 0	$ 18,300,000
Stated interest rate	4.25%	4.25%
Maturity date		Dec. 31, 2024