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Income taxes - Common Distributions (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Common Distributions Paid [Abstract] |  |  |
Ordinary income | $ 0.000 | $ 0.080 | $ 0.240
Capital gain | 0.000 | 0.240 | 0.000
Return of capital | 0.069 | 0.150 | 2.690
Total distributions per share | $ 0.069 | $ 0.470 | $ 2.930

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