Restructuring Charges - Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Changes in restructuring accrual
Balance at the beginning of the period	$ 2,213	$ 1,520	$ 1,796
Provision	6,006	7,395	9,971
Payments	(5,378)	(6,702)	(10,247)
Balance at the end of the period	2,841	2,213	1,520
Non-cash share based compensation	15,270	16,074	24,396
Non-cash charges related to share based compensation	15,270	16,074	24,396
Personnel severance and related costs
Changes in restructuring accrual
Balance at the beginning of the period	2,143	1,520	1,796
Provision	5,803	4,681	4,714
Payments	(5,105)	(4,058)	(4,990)
Balance at the end of the period	2,841	2,143	1,520
Facility Related Costs and Other
Changes in restructuring accrual
Balance at the beginning of the period	70
Provision	203	2,714	5,257
Payments	(273)	(2,644)	(5,257)
Balance at the end of the period		70
Restructuring
Changes in restructuring accrual
Non-cash share based compensation	$ 397	$ 1,161	$ 1,880

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

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