Restructuring Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]
Restructuring expense (income)	$ 12,942	$ 9,008	$ (2,960)
One-time Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense (income)	(854)	17,012	937
Contract Termination [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense (income)	6,038	444	186
Gain on disposal of fixed assets [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense (income)	1,361	(15,963)	(5,533)
Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense (income)	4,558	5,711	1,450
8742 Services, Management Consulting Services [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense (income)	$ 1,839	$ 1,804	$ 0