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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Nov. 02, 2017 | Nov. 01, 2017
Class of Stock [Line Items] |  |  |  |  |
Par or stated value per share (usd per share) | $ 0.01 | $ 0.01 |  |  |
Common stock issued through the At-The-Market Offering Program (in shares) | 1,380,017 | 683,548 | 0 |  |
Commissions paid to sales agents | $ 1,947 | $ 1,122 | $ 491 |  |
Private Placement |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Aggregate offering price |  |  |  | $ 200,000 | $ 125,000
Total gross proceeds | 121 | $ 50 |  |  |
Common stock, available for issuance | $ 150,000 |  |  |  |
Private Placement | Common Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Common stock issued through the At-The-Market Offering Program (in shares) | 1,380,017 | 683,548 |  |  |
Weighted average price (in usd per share) | $ 87.46 | $ 73.15 |  |  |
Commissions paid to sales agents | $ 1,512 | $ 657 |  |  |

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