Fair Value Definition and Hierarchy - Assets and Liabilities at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Put Option
Assets:
Assets	$ 11,584
Life Insurance Policy
Assets:
Assets	787,260	$ 796,039
Level 1 | Put Option
Assets:
Assets	11,584
Level 1 | Life Insurance Policy
Assets:
Assets	0	0
Level 2 | Put Option
Assets:
Assets	0
Level 2 | Life Insurance Policy
Assets:
Assets	0	0
Level 3 | Put Option
Assets:
Assets	0
Level 3 | Life Insurance Policy
Assets:
Assets	$ 787,260	$ 796,039