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Commitments and Contingencies - Operating Leases Future Minimum Payments (Details) $ in Thousands	Jun. 30, 2019 $ / €	Jun. 30, 2019 USD ($)	Jun. 30, 2019 $ / £	Dec. 31, 2018 $ / €	Dec. 31, 2018 USD ($)	Dec. 31, 2018 $ / £
Operating Lease Liabilities, Payments Due [Abstract]
2019 (remainder)		$ 1,038
2020		1,385
2021		1,385
2022		1,385
2023		1,385
2024		1,390
Thereafter		40,189
Total minimum lease payments		48,157
Less: Effects of discounting		(23,516)
Total present value of lease payments		$ 24,641
Foreign currency exchange rate (gbp, eur per usd)	1.14		1.27	1.14		1.27
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2019					$ 1,371
2020					1,371
2021					1,371
2022					1,371
2023					1,371
Thereafter					40,519
Total minimum lease payments					47,374
Less: Effects of discounting					(23,370)
Total present value of lease payments					$ 24,004

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