Leases - Operating lease ROU assets, operating lease liabilities and other supplemental information (Details) $ in Thousands	Jun. 30, 2020 USD ($)
Operating leases:
Operating lease right-of-use assets	$ 48,658
Accrued expenses	8,083
Long-term operating lease liabilities	$ 73,299
Weighted-average remaining lease term (years)	10 years 3 months 25 days
Weighted-average discount rate	3.83%