Subsequent Events (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Apr. 30, 2020	Mar. 31, 2020	Mar. 31, 2019	May 01, 2020	Apr. 15, 2020
Subsequent Event [Line Items]
Gain on extinguishment of debt		$ 17,631	$ 0
Subsequent Event [Member]
Subsequent Event [Line Items]
Subsequent event pending litigation					$ 200,000
Gain on extinguishment of debt	$ 47,000
Senior Notes Due Two Thousand And Twenty Three [Member]
Subsequent Event [Line Items]
Debt Instrument, Repurchased Face Amount		33,400
Debt Instrument, Repurchase Amount		19,500
Senior Notes Due Two Thousand And Twenty Three [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Debt Instrument, Repurchased Face Amount				$ 17,000
Debt Instrument, Repurchase Amount				9,800
3.8% Senior Notes due 2024
Subsequent Event [Line Items]
Debt Instrument, Repurchased Face Amount		7,000
Debt Instrument, Repurchase Amount		$ 3,800
3.8% Senior Notes due 2024 | Subsequent Event [Member]
Subsequent Event [Line Items]
Debt Instrument, Repurchased Face Amount				82,000
Debt Instrument, Repurchase Amount				$ 43,100