Restructuring and Related Charges Restructuring Reserve (Details) - 2015 Restructuring Plan [Member] - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Restructuring Reserve [Roll Forward]
Employee termination costs		$ 26	$ 560	$ (644)	$ 5,147
Employee Termination Benefits [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning of period				11,969	36,808
Employee termination costs				0	10,286
Changes in estimate	[1]			(644)	(4,378)
Payments and other				(6,222)	(16,386)
Restructuring reserve, end of period		$ 5,103	$ 26,330	$ 5,103	$ 26,330

[1] During the six months ended June 30, 2016, changes in estimate were primarily a result of the Company's ability to reduce severance payments to former employees who obtain subsequent employment during their respective severance periods. During the six months ended June 30, 2015, changes in estimate were primarily a result of a higher number of employees accepting relocation offers than the Company initially estimated.