Business Segments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 segment	Mar. 31, 2014
Business Segments
Number of operating segments	2
Number of reportable segments	2
Business segments, information about operations
Operating revenues	$ 121,173	$ 132,727
Operating income	3,015	4,579
Operating Segments | Customer Interaction
Business segments, information about operations
Operating revenues	109,315	118,734
Operating income	1,527	1,950
Operating Segments | Trillium Software
Business segments, information about operations
Operating revenues	11,858	13,993
Operating income	3,013	3,595
Corporate, Non-Segment
Business segments, information about operations
Operating income	$ (1,525)	$ (966)