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Derivative Financial Instruments (Details) - Not designated as a hedge - Total return swap contracts $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) contract	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($) contract
Derivative Financial Instruments
Number of contracts \| contract	17		14
Notional value	$ 223,200		$ 228,200
Cash collateral posted by counterparties	20,400
Cash collateral with the counterparties			3,700
Level 2
Derivative Financial Instruments
Net total return swap (liability) asset	20,240		(3,990)
Investment and other income (loss) \| Level 2
Derivative Financial Instruments
Net (losses) gains recognized in income	42,069	$ (20,622)
Prepaid expenses and other current assets \| Level 2
Derivative Financial Instruments
Fair value - assets	$ 20,240
Other current liabilities \| Level 2
Derivative Financial Instruments
Fair value - liabilities			$ 3,990