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Property, Plant & Equipment
3 Months Ended
Mar. 31, 2014
Property, Plant and Equipment [Line Items]  
Property, Plant & Equipment
Property, Plant & Equipment

Property, plant and equipment consisted of the following at March 31, 2014 and December 31, 2013:
 
March 31, 2014
 
December 31, 2013
Property, plant and equipment
$
114,127,000

 
$
109,407,000

Accumulated depreciation
(54,269,000
)
 
(52,929,000
)
Property, plant and equipment — net
$
59,858,000

 
$
56,478,000



Property, plant, and equipment are recorded at cost. Depreciation is provided on a straight-line method over the estimated useful lives of the assets. The carrying amount of long-lived assets is evaluated annually to determine if an adjustment to the depreciation period or to the unamortized balance is warranted. Additions in progress were $7,955,000 and $5,953,000 at March 31, 2014 and December 31, 2013, respectively. The Company capitalized $22,000 and $0 of interest expense for the three months ended March 31, 2014 and 2013, respectively. At March 31, 2014, and December 31, 2013, purchase commitments for capital expenditures in progress were $5,868,000 and $4,629,000, respectively.