Leases - Supplemental balance sheet information (Details) $ in Thousands	Jun. 30, 2020 USD ($)
Leases [Abstract]
Operating lease right-of-use assets (included within Investments and other assets)	$ 138,601
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:InvestmentsAndOtherNoncurrentAssets
Current operating lease liabilities (included within Other accrued liabilities)	$ 43,327
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:OtherAccruedLiabilitiesCurrent
Long-term operating lease liabilities (included within Other liabilities)	$ 96,446
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesNoncurrent
Total operating lease liabilities	$ 139,773
Weighted average remaining lease term	5 years 2 months 12 days
Weighted average discount rate	2.10%