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Earnings Per Share (Earnings Allocable to Common Shares) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Numerator for basic earnings per share:
Net income (loss) allocable to common shareholders	$ 121,856	$ (2,069)	$ 101,908	$ (46,850)
Numerator for diluted earnings per share:
Net income (loss) allocable to common shareholders - Diluted	$ 121,856	$ (2,069)	$ 101,908	$ (46,850)
Denominator for basic and diluted earnings per share:
Weighted average common shares outstanding for basic earnings per common share	71,299,000	75,033,000	72,675,000	76,232,000
Add: Effect of assumed shares issued under treasury stock method for restricted stock units	221,000		206,000
Add: Effect of convertible debt	8,967,000		5,521,000
Weighted average common shares outstanding for diluted earnings per common share	80,487,000	75,033,000	78,402,000	76,232,000
Basic and diluted earnings per common share:
Net income (loss) allocable to common shareholders - Basic (in dollars per share)	$ 1.71	$ (0.03)	$ 1.40	$ (0.61)
Diluted earnings per common share:
Net income (loss) allocable to common shareholders - Diluted (in dollars per share)	$ 1.51	$ (0.03)	$ 1.30	$ (0.61)
3.125% Senior Convertible Notes
Diluted earnings per common share:
Antidilutive (in shares)		0		0
Stated interest rate	3.125%	3.125%	3.125%	3.125%

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