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Derivative Financial Instruments (Details) - Not designated as a hedge - Total return swap contracts $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($) contract	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) contract	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($) contract
Derivative Financial Instruments
Number of contracts \| contract	14		14		5
Notional value	$ 222,100		$ 222,100		$ 194,400
Cash collateral with the counterparties	600		600		5,200
Level 2
Derivative Financial Instruments
Net total return swap (liability) asset	(314)		(314)		4,968
Investment and other income (loss) \| Level 2
Derivative Financial Instruments
Net gains (losses) recognized in income	135	$ (6,769)	(25,728)	$ (7,313)
Prepaid expenses and other current assets \| Level 2
Derivative Financial Instruments
Fair value - assets	153		153		$ 4,968
Other current liabilities \| Level 2
Derivative Financial Instruments
Fair value - liabilities	$ 467		$ 467