Equity (Details) - USD ($) $ in Thousands				12 Months Ended
	May 17, 2018	Oct. 10, 2017	Mar. 11, 2016	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jun. 01, 2017	May 31, 2017
Subsidiary, Sale of Stock [Line Items]
Offering costs	$ 200	$ 300		$ 0	$ 204	$ 280
Consideration received on sale of stock			$ 226,400
Common stock, shares authorized (in shares)				160,000,000	160,000,000
Issuance cost of equity					$ 204	$ 280
Preferred shares authorized (in shares)				2,000,000
Common Stock
Subsidiary, Sale of Stock [Line Items]
Common stock, shares authorized (in shares)							160,000,000	120,000,000
Public Stock Offering
Subsidiary, Sale of Stock [Line Items]
Consideration received on sale of stock		$ 208,400
Public Stock Offering | Common Stock
Subsidiary, Sale of Stock [Line Items]
Shares issued (in shares)	7,000,000	8,000,000