Equity (Details) - USD ($) $ in Thousands			12 Months Ended
	May 17, 2018	Mar. 11, 2016	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Subsidiary, Sale of Stock [Line Items]
Offering costs	$ 200		$ 0	$ 0	$ 204
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
Preferred shares authorized (in shares)			2,000,000
Public Stock Offering | Common Stock
Subsidiary, Sale of Stock [Line Items]
Shares issued (in shares)	7,000,000