Goodwill - (Details 2) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($)
Goodwill [Roll Forward]
Balance at December 31, 2015	$ 218,972
Additions to goodwill	3,480
Balance at March 31, 2016	222,452
Customer Interaction
Goodwill [Roll Forward]
Balance at December 31, 2015	69,699
Additions to goodwill	3,480
Balance at March 31, 2016	73,179
Trillium Software
Goodwill [Roll Forward]
Balance at December 31, 2015	149,273
Additions to goodwill	0
Balance at March 31, 2016	$ 149,273