Leases - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	May 31, 2020	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Operating lease, right-of-use asset	$ 82,681		$ 82,681			$ 27,532
Operating lease liability	84,200		84,200
Operating lease liability, current	11,500		11,500
Operating lease liability, noncurrent	$ 72,700		$ 72,700
Weighted average minimum lease term			17 years
Weighted average discount rate	5.70%		5.70%
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	$ 54,800
Finance lease, cost	600		$ 900
Operating lease, cost	2,900	$ 2,700	8,400	$ 8,000
Cash paid, lease liabilities, operating leases	$ 2,600	$ 2,300	$ 7,000	$ 7,600
Cologne, Germany
Lessee, Lease, Description [Line Items]
Lessee, finance lease, term of contract	25 years		25 years
Undiscounted future lease payments					$ 6,000
Undiscounted future lease payments, term of lease					10 years