Restructuring and Related Charges Restructuring Reserve (Details) - 2015 Restructuring Plan [Member] - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Restructuring Reserve [Roll Forward]
Employee termination costs		$ (670)	$ 4,587
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]	(670)	(5,036)
Payments and other		(4,415)	(6,568)
Restructuring reserve, end of period		$ 6,884	$ 35,490

[1] During the three months ended March 31, 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 three months ended March 31, 2015, changes in estimate were primarily a result of a higher number of employees accepting relocation offers than the Company initially estimated.