Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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-Publisher FASB

-Name Accounting Standards Codification

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For each balance sheet presented, the amount of accumulated amortization for capitalized computer software costs.

+ References

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

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-Name Accounting Standards Codification

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For each income statement presented, the amount charged to expense for amortization of capitalized computer software costs.

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Amount before accumulated amortization of capitalized costs for computer software, including but not limited to, acquired and internally developed computer software.

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The carrying amount of capitalized computer software costs net of accumulated amortization as of the balance sheet date.

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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.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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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.

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Property and Equipment (Details) (USD $)	12 Months Ended
Property and Equipment (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Amount of property and equipment
Property and Equipment gross	$ 214,022,000	$ 180,504,000
Accumulated depreciation and amortization	84,337,000	67,979,000
Property and Equipment net	129,685,000	112,525,000
Depreciation expense	22,000,000	18,600,000	15,500,000
Land
Amount of property and equipment
Property and Equipment gross	4,653,000	4,653,000
Buildings and Leasehold improvements
Amount of property and equipment
Property and Equipment gross	20,299,000	21,081,000
Buildings and Leasehold improvements \| Minimum
Amount of property and equipment
Estimated Useful Lives	3 years
Buildings and Leasehold improvements \| Maximum
Amount of property and equipment
Estimated Useful Lives	15 years
Office equipment, furniture and fixtures
Amount of property and equipment
Property and Equipment gross	8,629,000	8,415,000
Office equipment, furniture and fixtures \| Minimum
Amount of property and equipment
Estimated Useful Lives	3 years
Office equipment, furniture and fixtures \| Maximum
Amount of property and equipment
Estimated Useful Lives	7 years
Computer equipment and software costs
Amount of property and equipment
Property and Equipment gross	88,077,000	80,233,000
Computer equipment and software costs \| Minimum
Amount of property and equipment
Estimated Useful Lives	3 years
Computer equipment and software costs \| Maximum
Amount of property and equipment
Estimated Useful Lives	9 years
Machinery, equipment and vehicles
Amount of property and equipment
Property and Equipment gross	92,364,000	66,122,000
Machinery, equipment and vehicles \| Minimum
Amount of property and equipment
Estimated Useful Lives	3 years
Machinery, equipment and vehicles \| Maximum
Amount of property and equipment
Estimated Useful Lives	30 years
Computer software costs
Computer software costs
Computer software costs	67,366,000	60,465,000
Accumulated amortization	35,499,000	27,710,000
Computer software costs, net	31,867,000	32,755,000
Amortization expense related to computer software costs	7,800,000	7,200,000	6,100,000
Software development in progress
Computer software costs
Computer software costs	6,000,000	3,000,000
Capital leases
Amount of property and equipment
Property and Equipment gross	5,268,000	4,489,000
Accumulated depreciation and amortization	1,869,000	816,000
Property and Equipment net	$ 3,399,000	$ 3,673,000