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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-Name Accounting Standards Codification

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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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Amount of interest capitalized during the period.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Allowance for Funds Used during Construction

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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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Property and Equipment (Details) (USD $)	12 Months Ended
Property and Equipment (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 169,987,000us-gaap_PropertyPlantAndEquipmentGross	$ 150,256,000us-gaap_PropertyPlantAndEquipmentGross
Less: Accumulated depreciation and amortization	(92,678,000)	(82,404,000)
Property and equipment, at cost, net	77,309,000us-gaap_PropertyPlantAndEquipmentNet	67,852,000us-gaap_PropertyPlantAndEquipmentNet
Depreciation and amortization	9,365,000	9,056,000	7,691,000
Land and land improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	3,107,000	2,490,000
Facilities in progress and software under development [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	10,408,000	6,435,000
Computer equipment and software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	99,306,000	83,089,000
Buildings and leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	37,013,000	38,403,000
Furniture, fixtures and equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	15,326,000	16,371,000
Assets under capital lease [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	4,827,000	3,468,000
Less: Accumulated depreciation and amortization	(2,000,000)	(1,400,000)
Property and equipment [Member]
Property, Plant and Equipment [Line Items]
Interest costs capitalized	400,000
Software Development [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, at cost, net	25,200,000	15,900,000
Depreciation and amortization	$ 6,300,000	$ 3,800,000	$ 3,300,000