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Basis of Presentation and Summary of Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Property, Plant and Equipment
Property, plant and equipment was comprised of the following at December 31, 2014 and March 31, 2015:
 
December 31, 2014
 
March 31, 2015
 
(in thousands)
Land
$
66,957

 
$
68,107

Buildings and improvements
148,483

 
156,257

Furniture, equipment and automobiles
66,020

 
67,185

Property, plant and equipment, at cost
281,460

 
291,549

Less: accumulated depreciation
(95,249
)
 
(97,565
)
Property, plant and equipment, net
$
186,211

 
$
193,984