Leases - Future minimum rental payments (Details) $ in Thousands	Jun. 30, 2019 USD ($)
Leases
2019 (remainder of year)	$ 150
2020	244
2021	172
2022	86
2023	14
Total future minimum lease payments	666
Imputed interest	(39)
Total	627
2019 (remainder of year)	15,873
2020	38,090
2021	28,788
2022	20,890
2023	13,711
2024	7,287
Thereafter	6,210
Total future minimum lease payments	130,849
Imputed interest	(15,211)
Operating Lease, Liability, Total	115,638
2019 (remainder of year)	16,023
2020	38,334
2021	28,960
2022	20,976
2023	13,725
2024	7,287
Thereafter	6,210
Total future minimum lease payments	131,515
Imputed interest	(15,250)
Total	$ 116,265