Commitments and Contingencies - Operating Leases (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Future minimum lease payments under noncancellable operating leases - As Lessor
Remainder of 2019	$ 21,892
2020	27,172
2021	22,450
2022	13,713
2023	9,815
2024 and thereafter	12,706
Total future minimum lease payments	107,748
Future minimum lease payments under noncancelable operating leases - As Lessee
Remainder of 2019	17,498
2020	22,068
2021	17,134
2022	11,070
2023	10,328
2024 and thereafter	13,353
Total future minimum lease payments	91,451
Less imputed lease interest	(24,150)
Operating lease obligation	67,301
Rental expense for all operating lease	6,000	$ 3,500
Gross profit on sale leaseback transactions	0	0
Right of use assets obtained in exchange for new operating lease liabilities	0	600
Prepaid rent and security deposit	6,800	8,300
Other information of operating leases
Cash payments	$ 5,728	$ 3,313
Weighted average remaining lease term (in years)	4 years 11 months 1 day	3 years 7 months 6 days
Weighted average discount rate (as a percent)	12.10%	12.00%
Maximum
Operating Leases
Lease Term - as Lessor	7 years
Lease Term - as Lessee	9 years
Minimum
Operating Leases
Lease Term - as Lessor	1 year
Lease Term - as Lessee	1 year
Sale Leaseback Agreements
Future minimum lease payments under noncancelable operating leases - As Lessee
Operating lease obligation	$ 35,600	$ 9,800
Short term operating lease obligation	6,000	2,600
Long term operating lease obligation	$ 29,600	$ 7,200

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