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Basis of Presentation and Summary of Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2014
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, 2013 and March 31, 2014:
 
December 31, 2013
 
March 31, 2014
 
(in thousands)
Land
$
55,639

 
$
56,890

Buildings and improvements
132,172

 
133,196

Furniture, equipment and automobiles
61,506

 
61,993

Property, plant and equipment, at cost
249,317

 
252,079

Less: accumulated depreciation
(88,627
)
 
(90,250
)
Property, plant and equipment, net
$
160,690

 
$
161,829