Operating and Capital Lease Commitments and Total Rental Expense - Lease Costs (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) lease	Mar. 31, 2019 USD ($)
Lease cost:
Number of operating leases | lease	493
Operating lease cost	$ 4,469	$ 4,881
Short-term lease cost	1,518	1,047
Variable lease cost	294	16
Total lease cost	6,281	5,944
Operating cash flows from operating leases	4,409	4,819
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 2,191	$ 1,701
Weighted-average remaining lease term - operating leases	3 years 9 months 18 days	2 years 8 months 12 days
Weighted-average discount rate - operating leases	9.00%	9.00%
Maximum
Lease cost:
Initial term	12 months