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Stockholders' Equity (ATM Program) (Details) - USD ($) $ / shares in Units, $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Class of Stock [Line Items] |  |  |  |
Total allowable shares (in shares) |  | 375,000,000 |  | 375,000,000
Total shares issued (in shares) |  | 175,616,386 |  | 175,232,971
Net proceeds |  | $ 3,325 | $ 65,440 |
Stock issuance costs |  | $ 17,125 | $ 7,810 |
ATM equity programs |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares of common stock (in shares) |  | 30,000 | 1,634,350 |
Average price per share (net) (in dollars per share) |  | $ 35.35 | $ 36.56 |
Net proceeds |  | $ 1,061 | $ 59,752 |
Stock issuance costs | [1] | $ 173 | $ 1,151 |
2020 ATM |  |  |  |
Class of Stock [Line Items] |  |  |  |
Total allowable shares (in shares) |  | 17,500,000 |  |
Total shares issued (in shares) |  | 1,599,304 |  |
2018 ATM |  |  |  |
Class of Stock [Line Items] |  |  |  |
Total allowable shares (in shares) |  | 12,000,000 |  |
Total shares issued (in shares) |  | 11,272,034 |  |
[1] | Stock issuance costs consist primarily of underwriters' fees and commissions, and legal and accounting fees.

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