Operating lease liability maturities (Details) $ in Thousands	Jun. 30, 2019 USD ($)
Lessee Disclosure [Abstract]
Operating lease liability payments, due 2019 (remaining after June 30, 2019)	$ 13,581
Operating lease liability payments, due 2020	20,146
Operating lease liability payments, due 2021	11,699
Operating lease liability payments, due 2022	5,526
Operating lease liability payments, due 2023	3,476
Operating lease liability payments, due thereafter	3,721
Total lease payments	58,149
Imputed interest	(4,161)	[1]
Total operating lease liability	$ 53,988
Weighted-average discount rate	6.60%

[1] ⁽¹⁾  The weighted-average discount rate used to determine the operating lease liability as of June 30, 2019 was 6.6 percent.