Stockholders’ and Mezzanine equity - Mezzanine Equity - Tabular Disclosure (Details) $ in Thousands |
12 Months Ended |
|---|---|
|
Dec. 31, 2016
USD ($)
| |
| Stockholders’ and Mezzanine equity |  |
| Series A preferred stock, at issuance (net) | $ 87,922 |
| Dividends on preferred stock | 940 |
| Accretion on preferred stock | 113 |
| Mezzanine equity at end of period | $ 88,975 |