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Common Stock and Other Equity Related Transactions - At-market offering (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Class of Stock [Line Items] |  |  |
Par or stated value per share (usd per share) | $ 0.01 | $ 0.01 |
Shares of Common Stock sold (in shares) | 861,141 | 1,380,017 | 683,548
Commissions paid to sales agents | $ 1,651 | $ 1,947 | $ 1,122
Private Placement |  |  |
Class of Stock [Line Items] |  |  |
Total gross proceeds | 78,755 | $ 120,698 | $ 50,000
Private Placement | Common Stock |  |  |
Class of Stock [Line Items] |  |  |
Aggregate offering price | $ 200,000 |  |
Shares of Common Stock sold (in shares) | 861,141 | 1,380,017 | 683,548
Weighted average price (in usd per share) | $ 91.45 | $ 87.46 | $ 73.15
Commissions paid to sales agents | $ 1,028 | $ 1,512 | $ 657

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