Commitments and Contingencies Operating Lease Obligations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020		Sep. 30, 2019
Contractual Commitments, Commitment [Line Items]
Lease cost	$ 5,687	$ 5,748	$ 17,044		$ 17,690
Variable lease cost	829	1,156	2,431		2,668
Sublease income	(190)	(232)	(623)		(739)
Total lease costs	6,378	6,695	19,007		19,732
Facility Leases
Contractual Commitments, Commitment [Line Items]
Short-term lease cost	$ 52	$ 23	$ 155	[1],[2]	$ 113

[1] During the nine months ended September 30, 2020, the Company recognized $0.3 operating right-of-use assets and leases liabilities increases for facility leases.

[2] The Company has entered into various agreements to sublease certain of its premises.