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Property, Plant & Equipment (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
Property, Plant & Equipment: |  |
Property, plant and equipment | $ 109,407 | $ 99,747
Accumulated depreciation | (52,929) | (48,189)
Property, plant and equipment — net | 56,478 | 51,558
Commitments for capital expenditures in progress recorded on balance sheet | 4,629 | 662
Capitalized interest expense | 63 | 174
Accounts payable |  |
Property, Plant & Equipment: |  |
Commitments for capital expenditures in progress recorded on balance sheet | 709 | 241
Land and land improvements |  |
Property, Plant & Equipment: |  |
Property, plant and equipment | 5,098 | 5,098
Buildings |  |
Property, Plant & Equipment: |  |
Property, plant and equipment | 36,651 | 36,556
Machinery and equipment |  |
Property, Plant & Equipment: |  |
Property, plant and equipment | 60,897 | 56,831
Tools, dies and patterns |  |
Property, Plant & Equipment: |  |
Property, plant and equipment | 808 | 808
Additions in progress |  |
Property, Plant & Equipment: |  |
Property, plant and equipment | $ 5,953 | $ 454

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