Stock repurchases (Details) - USD ($) $ / shares in Units, $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2013 |
Dec. 31, 2015 |
Apr. 01, 2013 |
|
| Stock repurchases | |||
| Number of shares repurchased and retired under the stock repurchase program | 722,000 | ||
| Value of shares repurchased and retired under the stock repurchase program excluding commissions paid | $ 4,820 | ||
| Average price under the stock repurchase program (in dollars per share) | $ 6.68 | ||
| Remaining amount authorized for the share repurchase program | $ 5,180 | ||
| Maximum | |||
| Stock repurchases | |||
| Amount of common stock approved by the entity for a stock repurchase program | $ 10,000 |