Share Repurchase (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Oct. 31, 2017
SHARE REPURCHASE [Abstract]
Authorized share repurchase amount				$ 3,000,000.0
Repurchase of common stock	$ 240,000	$ 0	$ 0
Repurchase of common stock, shares	15,000