Lease Disclosures Future minimum lease payments under noncancelable leases as lessee (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Finance Leases
2019 (remaining three months)	$ 5,100
2020	20,100
2021	16,500
2022	14,700
2023	11,600
Thereafter	65,000
Total minimum lease payments	133,000
Less: interest/imputed interest	(39,200)
Total obligations	93,800
Less: current portion	(12,500)
Long-term lease obligations	81,317
Operating Leases
2019 (remaining three months)	23,200
2020	95,900
2021	79,100
2022	71,300
2023	58,700
Thereafter	220,800
Total minimum lease payments	549,000
Less: interest/imputed interest	(112,000)
Total obligations	437,000
Less: current portion	(67,815)	$ 0
Long-term lease obligations	$ 369,164	$ 0