Leases - Maturities of lease liabilities (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Leases
2020	$ 422
2021	355
2022	267
2023	185
2024	148
Thereafter	289
Total lease payments	1,666
Imputed interest	(161)
Total	1,505
2020	38,972
2021	34,384
2022	26,416
2023	17,797
2024	10,530
Thereafter	8,975
Total lease payments	137,074
Imputed interest	(14,314)
Operating Lease, Liability, Total	122,760
2020	39,394
2021	34,739
2022	26,683
2023	17,982
2024	10,678
Thereafter	9,264
Total lease payments	138,740
Imputed interest	(14,475)
Total	$ 124,265