Leases - Supplemental balance sheet information (Details) $ in Thousands	Mar. 31, 2020 USD ($)
Leases [Abstract]
Operating lease right-of-use assets (included within Investments and other assets)	$ 137,665
Current operating lease liabilities (included within Other accrued liabilities)	40,866
Long-term operating lease liabilities (included within Other liabilities)	97,317
Total operating lease liabilities	$ 138,183
Weighted average remaining lease term	5 years 3 months 18 days
Weighted average discount rate	2.10%