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Common Stock and Other Equity Related Transactions - ATM Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Class of Stock    
Commissions paid to sales agents $ 286 $ 932
ATM | Common Stock    
Class of Stock    
Issuance of common stock (in shares)   1,010,472
Weighted average price (usd per share)   $ 58.71
Total gross proceeds   $ 59,319
Commissions paid to sales agents   $ 771