Equity - At-The-Market Offering (Details) - USD ($) $ / shares in Units, shares in Thousands |
3 Months Ended | ||
|---|---|---|---|
Mar. 31, 2019 |
Mar. 31, 2018 |
Mar. 04, 2019 |
|
| ATM Program activity | |||
| Gross proceeds | $ 47,260,000 | $ (10,000) | |
| Commissions paid on stock issuance | 600,000 | ||
| At-The-Market Offering | |||
| Class of Stock [Line Items] | |||
| Remaining offering amount available | $ 300,000,000 | ||
| ATM Program activity | |||
| Number of shares (in shares) | 2,459 | ||
| Average sales price per share (in usd per share) | $ 19.48 | ||
| Gross proceeds | $ 47,893,000 | ||
| At-The-Market Offering | Maximum | |||
| Class of Stock [Line Items] | |||
| Authorized aggregate offering price of common stock | $ 300,000,000.0 | ||