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Income Taxes (Details 2) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Current deferred tax assets: |  |
Costs and estimated earnings in excess of billings on uncompleted contracts, net | $ 1,323 | $ 1,459
Accrued employee benefits | 1,612 | 3,110
Inventories | 1,393 | 1,337
Trade receivable, net | 650 | 625
Net operating loss carryforwards | 364 | 622
Accrued professional fees |  | 77
Other | 693 | 176
Total | 6,035 | 7,406
Valuation allowance | (146) | (350)
Deferred income taxes | 5,177 | 6,391
Current deferred tax liabilities: |  |
Prepaid expenses | (712) | (665)
Current deferred tax assets, net | 5,177 | 6,391
Noncurrent deferred tax assets: |  |
Net operating loss carryforwards | 549 | 499
Tax credit carryforwards | 64 | 102
Accrued employee benefits | 3,673 | 2,708
Other assets | 4,527 | 3,617
Other | 17 | 219
Total | 8,830 | 7,145
Valuation allowance | (794) | (576)
Deferred Tax Assets, Net of Valuation Allowance Noncurrent | 8,036 | 6,569
Noncurrent deferred tax liabilities: |  |
Property and equipment | (23,290) | (27,157)
Noncurrent deferred tax liabilities, net | (15,254) | (20,588)
Net deferred tax liabilities | $ (10,077) | $ (14,197)

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- Definition Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 11 -Subparagraph d, e, f -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6969291&loc=d3e28680-109314 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 43 -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
Name: | us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant