Leases - Future Minimum Cash Outflow and Weighted-average Remaining Lease Term and Discount Rate (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Future minimum lease payments finance lease
2019	$ 4,203
2020	5,720
2021	5,848
2022	5,980
2023	6,114
Thereafter	85,905
Total lease payments	113,770
Less interest portion	(65,221)
Finance lease obligation	48,549
Future minimum lease payments operating lease
2019	2,859
2020	3,107
2021	1,447
2022	372
2023	43
Thereafter	21
Total lease payments	7,849
Less interest portion	(398)
Operating lease obligations	7,451
Future minimum lease payments finance and operating lease
2019	7,062
2020	8,827
2021	7,295
2022	6,352
2023	6,157
Thereafter	85,926
Total lease payments	121,619
Less interest portion	(65,619)
Total lease liabilities	$ 56,000
Lease term and discount rate
Operating leases -Weighted-average remaining lease term (in years)	2 years 4 months 24 days
Finance leases - Weighted-average remaining lease term (in years)	17 years 9 months 18 days
Operating leases - Weighted-average discount rate	4.50%
Finance leases - Weighted-average discount rate	10.50%
Operating lease term	22 years
Minimum
Lease term and discount rate
Finance lease term	1 year
Maximum
Lease term and discount rate
Finance lease term	10 years