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Earnings Per Share - Earnings Allocable to Common Shares (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Numerator for basic earnings per share:
Net income (loss) allocable to common shareholders	$ (17,565)	$ 26,809
Numerator for diluted earnings per share:
Net income (loss) allocable to common shareholders	$ (17,565)	$ 29,059
Denominator for basic and diluted earnings per share:
Weighted average common shares outstanding for basic earnings per common share (in shares)	67,747	67,913
Add: Effect of assumed shares issued under treasury stock method for restricted stock units (in shares)	0	122
Add: Effect of series J convertible perpetual preferred stock (in shares)	0	15,635
Weighted average common shares outstanding for diluted earnings per common share (in shares)	67,747	83,670
Basic earnings per common share:
Net income (loss) allocable to common shareholders (in dollars per share)	$ (0.26)	$ 0.39
Diluted earnings per common share:
Net income (loss) allocable to common shareholders (in dollars per share)	$ (0.26)	$ 0.35

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