Operating and Capital Lease Commitments and Total Rents - Lease Costs (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)
Lease cost:
Operating Lease, Cost	$ 4,760	$ 14,492
Short-term Lease, Cost	1,032	3,147
Variable Lease, Cost	55	92
Total lease cost	5,847	17,731
Operating cash flows from operating leases	4,716	14,333
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 2,335	$ 6,915
Operating Lease, Weighted Average Remaining Lease Term	2 years 10 months 24 days	2 years 10 months 24 days
Operating Lease, Weighted Average Discount Rate, Percent	9.00%	9.00%
Maximum
Lease cost:
Initial term	12 months	12 months