Leases - Balance Sheet and Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Jan. 01, 2019
Operating leases:
Operating lease right-of-use assets	$ 206,096	$ 206,096	$ 214,000
Operating lease liabilities	186,680	186,680	199,857
Current portion of operating lease liabilities	28,059	28,059	$ 20,883
Total operating lease liabilities	$ 214,739	$ 214,739
Weighted-average remaining lease term, operating leases	7 years 3 months 29 days	7 years 3 months 29 days
Weighted-average discount rate, operating leases	8.12%	8.12%
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 11,381	$ 31,341