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Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands			1 Months Ended		3 Months Ended				5 Months Ended	12 Months Ended
	Jun. 10, 2019	Aug. 02, 2018	Oct. 31, 2017	Aug. 31, 2017	Jun. 30, 2019	Mar. 31, 2019	Mar. 31, 2018	Jun. 30, 2017	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Class of Stock [Line Items]
Common stock, shares authorized (in shares)									450,000,000	450,000,000	450,000,000
Common stock, par value (in dollars per share)									$ 0.01	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)									50,000,000	50,000,000	50,000,000
Preferred stock, par value (in dollars per share)									$ 0.01	$ 0.01	$ 0.01
Common stock, shares issued (in shares)									133,853,565	153,537,296	133,853,565
Common shares outstanding (in shares)									133,853,565	153,537,296	133,853,565
Stock issued during period, value, conversion of convertible securities										$ 33,778	$ 180,016
Proceeds from issuance of common stock, net of offering costs					$ 314,800		$ 275,900	$ 248,900
Common Stock
Class of Stock [Line Items]
Share price (in dollars per share)									$ 16.66	$ 18.29	$ 16.66
Issuance of stock (in shares)										17,250,000	15,525,000	15,470,000
Stock issued during period, value, conversion of convertible securities										$ 20	$ 108
Exchange of convertible senior notes for common stock (in shares)										1,967,361	10,828,475
Common Stock | Convertible Debt | 2019 Notes
Class of Stock [Line Items]
Price per share of issued stock (in dollars per share)						$ 17.17
Stock issued during period, value, conversion of convertible securities						$ 33,800
Exchange of convertible senior notes for common stock (in shares)		10,020,328				1,967,361			2,775,509		10,828,475
Common Stock | Follow-on public offering
Class of Stock [Line Items]
Issuance of stock (in shares)					17,250,000		15,525,000	13,800,000
Price per share of issued stock (in dollars per share)					$ 18.27		$ 17.77	$ 18.05
QHREAC
Class of Stock [Line Items]
Common stock, par value (in dollars per share)			$ 0.01
Stock repurchased (in shares)			1,670,000
Value of stock repurchased			$ 30,800
Share price (in dollars per share)			$ 18.44
Series B Preferred Stock
Class of Stock [Line Items]
Preferred stock, par value (in dollars per share)			$ 0.01
Preferred stock, shares issued (in shares)									6,770,393	6,770,393	6,770,393
Preferred stock, shares outstanding (in shares)									6,770,393	6,770,393	6,770,393
Stock repurchased (in shares)			1,229,607
Value of stock repurchased			$ 30,800
Share price (in dollars per share)			$ 25.04
Preferred stock, liquidation value per share (in dollars per share)			25.00
Preferred stock, accumulated and unpaid dividends (in dollars per share)			$ 0.04
Series C Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)									6,900,000	0	6,900,000
Preferred stock, shares outstanding (in shares)	6,900,000								6,900,000	0	6,900,000
Redemption of preferred stock (in shares)	6,900,000
Preferred stock, redemption price (in dollars per share)	$ 25.00
Preferred stock, dividends per share, declared (in dollars per share)	$ 0.2223
Series A Preferred Stock
Class of Stock [Line Items]
Redemption of preferred stock (in shares)				3,450,000
Preferred stock, redemption price (in dollars per share)				$ 25.00
Preferred stock, accumulated and unpaid dividends (in dollars per share)				$ 0.1079

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