Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Numerator:
Net (loss) income attributable to common stockholders - basic	$ (24,691)	$ 17,368	$ (63,665)	$ 52,464
Interest expense attributable to convertible notes	0	0	0	0
Net (loss) income attributable to common stockholders - diluted	$ (24,691)	$ 17,368	$ (63,665)	$ 52,464
Denominator:
Weighted average common shares outstanding (in shares)	54,624,739	54,391,834	54,561,411	52,017,520
Weighted average restricted stock shares (in shares)	580,343	461,371	578,752	474,804
Basic weighted average shares outstanding (in shares)	55,205,082	54,853,205	55,140,163	52,492,324
Effect of dilutive shares issued in an assumed conversion of the convertible senior notes (in shares)	0	0	0	0
Diluted weighted average shares outstanding (in shares)	55,205,082	54,853,205	55,140,163	52,492,324
(Loss) earnings per share
Basic (in usd per share)	$ (0.45)	$ 0.32	$ (1.15)	$ 1.00
Diluted (in usd per share)	$ (0.45)	$ 0.32	$ (1.15)	$ 1.00
Interest expense attributable to antidilutive convertible notes excluded from computation of earnings per share	$ 4,500		$ 13,600	$ 13,500
Antidilutive convertible notes excluded from computation of earnings per share (in shares)	13,717,782		13,717,782	13,665,164
Deferred debt issuance cost, adjustments	$ 100		$ 100
Antidilutive securities excluded from computation of earnings per share, additional warrants, number (in shares)			364,182