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Issuances of Common Stock - At-the-Market (ATM) Program (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
At-the-Market (ATM) Programs |  |  |
Gross proceeds | $ 1,094,938 | $ 1,264,518 | $ 1,125,364
ATM Program |  |  |
At-the-Market (ATM) Programs |  |  |
At-the-Market equity distribution program, authorized shares (in shares) | 33,402,405 |  |
Shares remaining for future issuance (in shares) | 15,678,031 |  |
Common stock | ATM Program |  |  |
At-the-Market (ATM) Programs |  |  |
Shares of common stock issued (in shares) | 17,724,374 | 17,051,456 | 19,138,610
Gross proceeds | $ 1,094,900 | $ 1,274,500 | $ 1,125,400

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