Restructuring and Related Charges - Changes in the Provision for Restructuring Activities (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017
Changes in the provision for the restructuring activities
Balance, beginning of the period		$ 36,171
Provision		13,136
Cash payments		(16,114)
Non-cash settlements		(453)
Balance, end of the period	$ 32,740	32,740
2014 Restructuring Plan \| Employee Severance
Changes in the provision for the restructuring activities
Balance, beginning of the period		1,015
Balance, end of the period	1,015	1,015
2014 Restructuring Plan \| Facility Costs
Changes in the provision for the restructuring activities
Balance, beginning of the period		13,995
Cash payments		(1,958)
Balance, end of the period	12,037	12,037
2016 Restructuring Plan
Changes in the provision for the restructuring activities
Provision	0
2016 Restructuring Plan \| Employee Severance
Changes in the provision for the restructuring activities
Balance, beginning of the period		6,041
Provision		4,353
Cash payments		(9,482)
Balance, end of the period	912	912
2016 Restructuring Plan \| Facility Costs
Changes in the provision for the restructuring activities
Balance, beginning of the period		15,090
Provision		8,401
Cash payments		(4,262)
Non-cash settlements		(453)
Balance, end of the period	18,776	18,776
2016 Restructuring Plan \| Other
Changes in the provision for the restructuring activities
Balance, beginning of the period		30
Provision		382
Cash payments		(412)
Balance, end of the period	$ 0	$ 0

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