Shareholders' Equity - Narrative (Details)	3 Months Ended				9 Months Ended
	Sep. 30, 2020 shares	Jun. 30, 2020 shares	Mar. 31, 2020 USD ($) $ / shares shares	Sep. 30, 2019 USD ($) $ / shares shares	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($) $ / shares shares	May 04, 2018 USD ($) agreement
Class of Stock [Line Items]
Number of separate equity distribution agreements | agreement							8
Shares issued, weighted average price per share (in dollars per share) | $ / shares			$ 31.07	$ 27.52		$ 27.52
Net proceeds from equity issuances			$ 1,200,000	$ 3,700,000	$ 1,240,000	$ 3,681,000
Common Stock
Class of Stock [Line Items]
Shares reserved for future issuances							$ 250,000,000.0
Common shares issued (in shares) | shares	0	0	46,500	100,000		100,000