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Property and Equipment (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Amount of property and equipment |  |  |
Property and Equipment gross | $ 180,504,000 | $ 141,931,000 |
Accumulated depreciation and amortization | 67,979,000 | 51,221,000 |
Property and Equipment net | 112,525,000 | 90,710,000 |
Depreciation expense | 18,600,000 | 15,500,000 | 9,300,000
Land |  |  |
Amount of property and equipment |  |  |
Property and Equipment gross | 4,653,000 | 5,008,000 |
Buildings and Leasehold improvements |  |  |
Amount of property and equipment |  |  |
Property and Equipment gross | 21,081,000 | 14,640,000 |
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 | 8,415,000 | 6,467,000 |
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 | 80,233,000 | 67,498,000 |
Computer software costs |  |  |
Amortization expense related to computer software costs | 7,200,000 | 6,100,000 | 4,200,000
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 | 66,122,000 | 48,318,000 |
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 | 60,465,000 | 50,592,000 |
Accumulated amortization | 27,710,000 | 20,481,000 |
Computer software costs, net | 32,755,000 | 30,111,000 |
Software development in progress |  |  |
Computer software costs |  |  |
Computer software costs | 3,000,000 | 7,700,000 |
Capital leases |  |  |
Amount of property and equipment |  |  |
Property and Equipment gross | 4,489,000 | 4,236,000 |
Accumulated depreciation and amortization | 816,000 | 713,000 |
Property and Equipment net | $ 3,673,000 | $ 3,523,000 |

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- Definition The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 14 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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- Definition 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 -Publisher FASB -Name Implementation Guide (Q and A) -Number FAS86 -Paragraph 21 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition For each income statement presented, the amount charged to expense for amortization of capitalized computer software costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 86 -Paragraph 11 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128487-111756 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Implementation Guide (Q and A) -Number FAS86 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details
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- Definition The carrying amount of capitalized computer software costs net of accumulated amortization as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Implementation Guide (Q and A) -Number FAS86 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128487-111756 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 86 -Paragraph 11 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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