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Capital structure (Details) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Oct. 16, 2014 | Feb. 28, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | May 31, 2013
Capital structure |  |  |  |  |
Common stock, authorized shares (in shares) |  |  | 125,000,000 | 125,000,000 |
Common stock |  |  |  |  |
Capital structure |  |  |  |  |
Common stock, authorized shares (in shares) |  |  |  |  | 125,000,000
Shares issued and sold (in shares) | 3,450,000 | 5,163,265 |  |  |
Public offering price (in dollars per share) | $ 36.25 | $ 24.50 |  |  |
Common stock shares issuable pursuant to the exercise by the underwriters of an over-allotment option (in shares) | 450,000 | 673,469 |  |  |
Net proceeds from public offerings | $ 117.6 | $ 118.4 |  |  |

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