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Stockholders' Equity (ATM Program) (Details) - USD ($) $ / shares in Units, $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Class of Stock [Line Items] |  |  |
Total allowable shares (in shares) | 375,000,000 |  | 375,000,000
Total shares issued (in shares) | 173,407,606 |  | 171,694,209
Net proceeds | $ 54,084 | $ 87,978 |
Stock issuance costs | $ 7,809 | $ 115 |
ATM |  |  |
Class of Stock [Line Items] |  |  |
Total allowable shares (in shares) | 12,000,000 |  |
Total shares issued (in shares) | 11,140,162 |  |
Shares of common stock (in shares) | 1,417,977 | 1,495,548 |
Average price per share (net) (in dollars per share) | $ 36.68 | $ 53.52 |
Net proceeds | $ 52,018 | $ 80,046 |
Stock issuance costs | $ 746 | $ 766 |

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