Leases (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Dec. 31, 2018
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	108 years	108 years
Operating lease cost	$ 2,573	$ 7,739
Short-term lease cost	0	0
Variable lease cost	1,365	5,489
Total lease cost	3,938	13,228
Cash paid for amonts included in measurement of operating lease liabilities	2,393	7,677
Right-of-use assets	90,023	90,023	$ 0
Current (included in Accrued liabilities in our Condensed Consolidated Balance Sheet)	3,538	3,538
Lease liability	$ 85,969	$ 85,969	$ 0
Weighted-average remaining lease term - operating leases (years)	15 years	15 years
Weighted-average discount rate - operating leases	4.65%	4.65%
2019 (remainder)	$ 1,603	$ 1,603
2020	7,615	7,615
2021	9,644	9,644
2022	9,625	9,625
2023	9,628	9,628
Thereafter	92,848	92,848
Total future lease payments	130,963	130,963
Less amount representing interest	41,456	41,456
Total obligations under operating leases	$ 89,507	$ 89,507
Minimum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	1 year	1 year
Maximum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	15 years	15 years