Equity - Narrative (Details) - USD ($) $ in Thousands	1 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2017	Sep. 30, 2019	Dec. 31, 2018
Equity
Common stock sold (in shares)		0	0
Sale of Stock, Consideration Received if Additional Shares are Issued	$ 60,000