Equity Offerings - Narrative (Details) - Distribution Agreement - USD ($)		9 Months Ended
	Nov. 03, 2017	Sep. 30, 2019
Subsidiary, Sale of Stock [Line Items]
Maximum aggregate offering price	$ 125,000,000.0
Consideration received		$ 38,500,000
Issuance Costs		$ 700,000
Number of Shares Issued ( in shares )		460,000
Average price (per share)		$ 83.81
Available to be offered		$ 31,500,000