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Property, Plant & Equipment
3 Months Ended
Mar. 31, 2015
Property, Plant and Equipment [Abstract]  
Property, Plant & Equipment
Property, Plant & Equipment

Property, plant and equipment consisted of the following at March 31, 2015 and December 31, 2014:
 
March 31, 2015
 
December 31, 2014
Property, plant and equipment
$
134,357,000

 
$
119,933,000

Accumulated depreciation
(59,345,000
)
 
(57,938,000
)
Property, plant and equipment — net
$
75,012,000

 
$
61,995,000



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 $2,021,000 and $979,000 at March 31, 2015 and December 31, 2014, respectively. The Company capitalized $2,000 and $22,000 of interest expense for the three months ended March 31, 2015 and 2014, respectively. At March 31, 2015 and December 31, 2014, purchase commitments for capital expenditures in progress were $1,020,000 and $1,682,000, respectively.