Leases - Future minimum rental payments (Details) $ in Thousands	Sep. 30, 2019 USD ($)
Leases
2019 (remainder of year)	$ 77
2020	263
2021	191
2022	106
2023	26
Total future minimum lease payments	663
Imputed interest	(37)
Total	626
2019 (remainder of year)	5,900
2020	41,500
2021	32,093
2022	24,128
2023	16,181
2024	8,963
Thereafter	7,271
Total future minimum lease payments	136,036
Imputed interest	(14,880)
Operating Lease, Liability, Total	121,156
2019 (remainder of year)	5,977
2020	41,763
2021	32,284
2022	24,234
2023	16,207
2024	8,963
Thereafter	7,271
Total future minimum lease payments	136,699
Imputed interest	(14,917)
Total	$ 121,782