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Derivative Financial Instruments (Details) - Not designated as a hedge - Total return swap contracts $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($) contract	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) contract	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($) contract
Derivative Financial Instruments
Number of contracts \| contract	11		11		14
Notional value	$ 221,800		$ 221,800		$ 228,200
Cash collateral posted by counterparties	3,800		3,800
Cash collateral with the counterparties					3,700
Level 2
Derivative Financial Instruments
Net total return swap (liability) asset	2,145		2,145		(3,990)
Investment and other income (loss) \| Level 2
Derivative Financial Instruments
Net (losses) gains recognized in income	(30,449)	$ (5,241)	11,620	$ (25,863)
Prepaid expenses and other current assets \| Level 2
Derivative Financial Instruments
Fair value - assets	$ 2,145		$ 2,145
Other current liabilities \| Level 2
Derivative Financial Instruments
Fair value - liabilities					$ 3,990