Basis of Presentation (Reconciliation of Net Income (Loss) and Weighted Average Shares Table) (Details) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Numerator
Net income (loss) - basic		$ 74,016	$ (25,674)
Interest on convertible senior notes including amortization of discount, net of tax		5,857	0
Net income (loss) - diluted		$ 79,873	$ (25,674)
Denominator
Weighted average common shares outstanding - basic		494,259	451,720
Restricted stock and performance-based equity awards		1,078	0
Convertible senior notes	[1]	90,853	0
Weighted average common shares outstanding - diluted		586,190	451,720
Debt Instrument, Convertible, Number of Equity Instruments		90,900

[1] For the three months ended March 31, 2020, shares shown under “convertible senior notes” represent the impact over the period of the approximately 90.9 million shares of the Company’s common stock issuable upon full conversion of our convertible senior notes which were issued on June 19, 2019.