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Common Stock Common Stock (Details) - shares	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Dec. 31, 2018
Class of Stock [Line Items]
Sales Agency Agreements Common Stock, Shares Authorized	200,000,000	200,000,000	200,000,000
Document Period End Date		Sep. 30, 2019
Sales Agency Agreement [Member]
Class of Stock [Line Items]
Shares issued from sales agency agreements	600,000	1,000,000.0
Sales Agency Agreements Common Stock, Shares Authorized	4,600,000	4,600,000
Common Stock Shares Authorized Under Sales Agency Agreements Remaining Shares Authorized To Sell	3,600,000	3,600,000

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