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Basis of Presentation and Summary of Significant Accounting Policies (Tables)
3 Months Ended
Mar. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Property, Plant and Equipment
Property, plant and equipment was comprised of the following at December 31, 2016 and March 31, 2017:
 
December 31, 2016
 
March 31, 2017
 
(in thousands)
Land
$
73,744

 
$
73,264

Buildings and improvements
195,214

 
196,670

Furniture, equipment and automobiles
76,664

 
77,807

Property, plant and equipment, at cost
345,622

 
347,741

Less: accumulated depreciation
(110,509
)
 
(113,325
)
Property, plant and equipment, net
$
235,113

 
$
234,416