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Property, plant and equipment (Details) (USD $)
In Thousands, unless otherwise specified |
Jun. 30, 2013
|
Dec. 31, 2012
|
|---|---|---|
| Property, plant and equipment | ||
| Total property, plant and equipment | $ 55,460 | $ 48,820 |
| Less accumulated depreciation | (30,292) | (28,933) |
| Net property, plant and equipment | 25,168 | 19,887 |
|
Land
|
||
| Property, plant and equipment | ||
| Total property, plant and equipment | 1,160 | 960 |
|
Land improvements
|
||
| Property, plant and equipment | ||
| Total property, plant and equipment | 2,677 | 1,768 |
|
Buildings
|
||
| Property, plant and equipment | ||
| Total property, plant and equipment | 15,852 | 12,852 |
|
Machinery and equipment
|
||
| Property, plant and equipment | ||
| Total property, plant and equipment | 24,846 | 24,286 |
|
Furniture and fixtures
|
||
| Property, plant and equipment | ||
| Total property, plant and equipment | 8,160 | 7,465 |
|
Mobile equipment and other
|
||
| Property, plant and equipment | ||
| Total property, plant and equipment | 1,270 | 1,138 |
|
Construction-in-process
|
||
| Property, plant and equipment | ||
| Total property, plant and equipment | $ 1,495 | $ 351 |