Leases Maturities of lease liabilities (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Leases [Abstract]
2019 (excluding the three months ended March 31, 2019)	$ 25,761
2020	32,704
2021	25,271
2022	24,851
2023	23,698
Thereafter	88,850
Total lease payments	221,135
Less: imputed interest	53,107
Total operating lease liabilities	$ 168,028