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Basis of Presentation and Summary of Significant Accounting Policies (Tables)
9 Months Ended
Sep. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Property, Plant and Equipment
Property, plant and equipment was comprised of the following at December 31, 2015 and September 30, 2016:
 
December 31, 2015
 
September 30, 2016
 
(in thousands)
Land
$
65,433

 
$
74,797

Buildings and improvements
180,804

 
190,910

Furniture, equipment and automobiles
71,943

 
74,864

Property, plant and equipment, at cost
318,180

 
340,571

Less: accumulated depreciation
(103,306
)
 
(109,106
)
Property, plant and equipment, net
$
214,874

 
$
231,465