Leases - Lease Cost (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Lease expense
Operating lease expense	$ 1,116
Variable lease expense	740
Total lease expense	1,856
Other information
Operating cash flows outflows related to operating leases	2,771
Right-of-use assets obtained in exchange for new operating lease liabilities	0
Right-of-use assets obtained in exchange for new finance lease liabilities	$ 14,294
Weighted-average remaining lease term - operating leases	54 years
Weighted-average remaining lease term - finance leases	70 years 7 months 6 days
Weighted-average discount rate - operating leases (percent)	5.50%
Weighted-average discount rate - finance leases (percent)	5.90%