Issuances of Common Stock - Issuance of Common Stock in Overnight Underwritten Public Offering (Details) - USD ($) $ in Thousands	1 Months Ended	9 Months Ended
	May 31, 2019	Sep. 30, 2019	Sep. 30, 2018
Class of Stock [Line Items]
Proceeds from share issuances, net		$ 845,061	$ 0
Common stock | Overnight Underwritten Public Offering
Class of Stock [Line Items]
Shares of common stock issued (in shares)	12,650,000
Underwriting discounts and other offering costs	$ 31,000
Proceeds from share issuances, net	$ 845,100