Fair Value Measurements (Level 3 Liabilities) (Details) - Recurring [Member] - Level 3 [Member] - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Business Combination, Contingent Consideration Arrangements, Change In Contingent Consideration Liability [Roll Forward]
Balance, Beginning of Period	$ 210	$ 377
Cash payments	(210)	(167)
Balance, End of Period	$ 0	$ 210