Commitments and Contingencies - Schedule of Lease Costs and Other Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Lessee, Lease, Description
Net lease cost	$ 2,432	$ 2,156	$ 4,776	$ 4,192
Right-of-use assets obtained in exchange for new operating lease liabilities	1,135	346	1,155	2,053
Operating Leases
Lessee, Lease, Description
Lease cost	2,456	2,166	4,794	4,210
Sublease income, ground leases (included in other operations revenue)	0	0	0	0
Cash paid for amounts included in the measurement of lease liabilities	$ 2,220	1,641	$ 4,234	3,250
Weighted-average discount rate (percent)	5.90%		5.90%		5.90%
Weighted-average remaining lease term (in years):	5 years 9 months 18 days		5 years 9 months 18 days		6 years 1 month 6 days
Ground lease
Lessee, Lease, Description
Lease cost	$ 624	627	$ 1,248	1,217
Sublease income, ground leases (included in other operations revenue)	(648)	(637)	(1,266)	(1,235)
Cash paid for amounts included in the measurement of lease liabilities	$ 624	$ 609	$ 1,248	$ 1,217
Weighted-average discount rate (percent)	10.20%		10.20%		10.20%
Weighted-average remaining lease term (in years):	47 years 6 months		47 years 6 months		48 years 1 month 6 days