Restructuring (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Restructuring Reserve [Roll Forward]
Restructuring	$ 331		$ 0	$ 2,620	$ 0
Payments for Restructuring				(627)
Strategic Transformation [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve		$ 4,234		4,234
Restructuring				2,620
Non-cash				(1,402)
Restructuring Reserve	4,825			4,825
Employee Related Termination Costs [Member] | Strategic Transformation [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve		4,234		4,234
Restructuring				(30)
Payments for Restructuring				(434)
Non-cash				0
Restructuring Reserve	3,770			3,770
Contract Termination Costs [Member]
Restructuring Reserve [Roll Forward]
Loss on sublease income		1,100
Deferred rent liability		(1,500)
Contract Termination Costs [Member] | Strategic Transformation [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve		0		0
Restructuring				(241)
Payments for Restructuring				(161)
Non-cash				1,457
Restructuring Reserve	1,055			1,055
Impairment of long-lived assets held-for-use		1,900
Fixed Asset Impairments [Member] | Strategic Transformation [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve		0		0
Restructuring				1,878
Payments for Restructuring				0
Non-cash				(1,878)
Restructuring Reserve	0			0
Stock-based Compensation [Member] | Strategic Transformation [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve		0		0
Restructuring				981
Payments for Restructuring				0
Non-cash				(981)
Restructuring Reserve	0			0
Other Costs [Member] | Strategic Transformation [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve		$ 0		0
Restructuring				32
Payments for Restructuring				(32)
Non-cash				0
Restructuring Reserve	$ 0			$ 0