Leases Supplemental balance sheet information (Details) $ in Thousands	Sep. 30, 2019 USD ($)
Leases [Abstract]
Operating lease right-of-use assets (included within Investments and other assets)	$ 136,769
Current operating lease liabilities (included within Other accrued liabilities)	38,658
Long-term operating lease liabilities (included within Other liabilities)	97,339
Total operating lease liabilities	$ 135,997
Weighted average remaining lease term (in years)	5 years 6 months 7 days
Weighted average discount rate	2.12%