The aggregate costs of keeping the property in good condition but that do not appreciably prolong the life or increase the value of the property.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.2)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

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Summary of Significant Accounting Policies - Property (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, plant and equipment
Depreciation expense	$ 3,422us-gaap_Depreciation	$ 3,068us-gaap_Depreciation	$ 2,819us-gaap_Depreciation
Repairs and maintenance expenses	$ 4,682	$ 3,509	$ 2,855
Land improvements and buildings \| Minimum
Property, plant and equipment
Estimated useful lives	15 years
Land improvements and buildings \| Maximum
Property, plant and equipment
Estimated useful lives	40 years
Leasehold Improvements
Property, plant and equipment
Estimated useful lives	12 years
Machinery and equipment \| Minimum
Property, plant and equipment
Estimated useful lives	3 years
Machinery and equipment \| Maximum
Property, plant and equipment
Estimated useful lives	20 years
Furniture and fixtures \| Minimum
Property, plant and equipment
Estimated useful lives	3 years
Furniture and fixtures \| Maximum
Property, plant and equipment
Estimated useful lives	12 years
Mobile equipment and other \| Minimum
Property, plant and equipment
Estimated useful lives	3 years
Mobile equipment and other \| Maximum
Property, plant and equipment
Estimated useful lives	10 years