Lessee Leases - Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Sep. 30, 2018
Lessee, Lease, Description [Line Items]
Operating lease cost	$ 3,700	$ 11,000
Cash paid for amounts included in the measurement of lease liabilities		11,023
Right-of-use assets obtained in exchange for new operating lease liabilities		$ 957	$ 0
Weighted Average Remaining Lease Term (in years)	6 years 7 months 6 days	6 years 7 months 6 days
Weighted-average discount rate ( as a percent )	6.40%	6.40%