Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	51			3	0	177
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities	10,192			10,365	0	10,365
Weighted Average Number of Shares Outstanding, Diluted	117,552			116,640	106,974	116,742
Net income (loss) per common share, Basic	$ 0.77			$ 2.13	$ (0.50)	$ 1.71
Earnings Per Share, Diluted	$ 0.71			$ 1.95	$ (0.50)	$ 1.59
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	11,773			10,576	11,859	8,452
Net Income (Loss) Attributable to Parent	$ 82,603	$ (69,071)	$ (66,611)	$ 226,086	$ (53,079)	$ 181,271
Dilutive Securities, Effect on Basic Earnings Per Share, Dilutive Convertible Securities	1,258			1,277	0	3,790
Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted	$ 83,861			$ 227,363	$ (53,079)	$ 185,061
Shares used in computing net loss per common share, Basic	107,309			106,272	106,974	106,200