Fair Value Measurements Level 3 Liabilities (Details) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Business Combination, Contingent Consideration Arrangements, Change In Contingent Consideration Liability [Roll Forward]
Change in fair value contingent consideration	$ 3,792	$ 0
Recurring [Member] | Level 3 [Member]
Business Combination, Contingent Consideration Arrangements, Change In Contingent Consideration Liability [Roll Forward]
Balance, Beginning of Period	6,940	$ 1,660	$ 1,660
Change in fair value contingent consideration	3,792
Cash payment	(2,366)		(750)
Balance, End of Period	782		6,940
Synchronite, LLC [Member]
Business Combination, Contingent Consideration Arrangements, Change In Contingent Consideration Liability [Roll Forward]
Change in fair value contingent consideration	100
Synchronite, LLC [Member] | Recurring [Member] | Level 3 [Member]
Business Combination, Contingent Consideration Arrangements, Change In Contingent Consideration Liability [Roll Forward]
Change in fair value contingent consideration	0		1,810
Contact At Once! [Member]
Business Combination, Contingent Consideration Arrangements, Change In Contingent Consideration Liability [Roll Forward]
Change in fair value contingent consideration	3,200
Contact At Once! [Member] | Recurring [Member] | Level 3 [Member]
Business Combination, Contingent Consideration Arrangements, Change In Contingent Consideration Liability [Roll Forward]
Change in fair value contingent consideration	$ 0		$ 4,220