Stockholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018
Class of Stock [Line Items]
Preferred stock, shares authorized		75,000,000
Preferred stock, par value		$ 0.001
Common stock, shares authorized		400,000,000	400,000,000
Common stock, par value	$ 0.001	$ 0.001	$ 0.001
Preferred stock, shares outstanding		0
Preferred stock, shares issued		0
Number of Shares Sold, Equity Distribution Agreement			0
Common Stock Shares Issued for Debt Exchange		0	0
Shares, Issued		213,669,597	212,477,101
Equity Offering
Class of Stock [Line Items]
Partial Exercise Of Option To Upsize Purchase Of Common Stock	2,205,529
Shares, Issued	23,205,529	0	0
Shares Issued, Price Per Share	$ 5.00
Option To Upsize Purchase Of Common Stock	3,150,000
Proceeds from Issuance or Sale of Equity	$ 110.8
7.0% Senior Notes
Class of Stock [Line Items]
Common Stock Shares Issued for Debt Exchange	10,863,000
Debt, stated interest rate	7.00%	7.00%
Amount of debt converted	$ 50.0
Merger
Class of Stock [Line Items]
Shares, Issued	0	0	100,000,000