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Basis of Presentation and Summary of Significant Accounting Policies (Tables)
 6 Months Ended
Jun. 30, 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 June 30, 2014:
 
December 31, 2013
 
June 30, 2014
 
(in thousands)
Land
$
55,639

 
$
62,435

Buildings and improvements
132,172

 
141,763

Furniture, equipment and automobiles
61,506

 
63,880

Property, plant and equipment, at cost
249,317

 
268,078

Less: accumulated depreciation
(88,627
)
 
(91,795
)
Property, plant and equipment, net
$
160,690

 
$
176,283