|
Goodwill and intangible assets (Details) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | ||||
|---|---|---|---|---|---|
|
Dec. 31, 2013
|
Dec. 31, 2014
|
Dec. 31, 2012
|
Feb. 22, 2013
|
Oct. 31, 2013
|
|
| Changes in goodwill | |||||
| Balance at the beginning of the period | $ 42,403 | $ 26,744 | |||
| Balance at the end of the period | 42,403 | 42,403 | 26,744 | ||
| Endeka Group Inc | |||||
| Changes in goodwill | |||||
| Balance at the beginning of the period | 5,776 | ||||
| Additions | 5,776 | ||||
| Balance at the end of the period | 5,776 | ||||
| AWG | |||||
| Changes in goodwill | |||||
| Balance at the beginning of the period | 9,883 | ||||
| Additions | 9,883 | ||||
| Balance at the end of the period | $ 9,883 |