Equity - At-The-Market Offering Program (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Class of Stock [Line Items]
Gross proceeds			$ 196,041
Commissions paid on stock issuance		$ 404
Prior ATM Program
Class of Stock [Line Items]
Number of shares (in shares)	2,459
Average sales price per share (usd per share)	$ 19.48
Gross proceeds	$ 47,893
Commissions paid on stock issuance	$ 600