Securities Offering, Authorized Amount

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- Definition

Securities Offering, Remaining Authorized Amount

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- Definition

Shares Issued During Period, Average Price Per Share

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

The cash outflow for cost incurred directly with the issuance of an equity security.

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The cash inflow from the additional capital contribution to the entity.

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- Definition

Number of new stock issued during the period.

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Equity - ATM Offering (Details) - USD ($) $ / shares in Units, shares in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2017
ATM Program activity
Gross proceeds				$ 130,546,000	$ 170,414,000
At-The-Market Offering
Class of Stock [Line Items]
Remaining offering amount available	$ 103,800,000			$ 103,800,000
ATM Program activity
Number of shares (in shares)	4,772	2,989	0	7,761
Average sales price per share (in usd per share)	$ 17.62	$ 16.13	$ 0.00	$ 17.04
Gross proceeds	$ 84,077,000	$ 48,198,000	$ 0	$ 132,275,000
Commissions paid on stock issuance	$ 1,100,000	$ 600,000
At-The-Market Offering \| Maximum
Class of Stock [Line Items]
Authorized aggregate offering price of common stock						$ 300,000,000.0