Leases - Supplemental balance sheet information (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Leases [Abstract]
Operating lease right-of-use assets (included within Investments and other assets)	$ 155,869
Current operating lease liabilities (included within Other accrued liabilities)	42,661
Long-term operating lease liabilities (included within Other liabilities)	112,442
Total operating lease liabilities	$ 155,103
Weighted average remaining lease term	6 years 4 months 24 days
Weighted average discount rate	2.30%