Annual report pursuant to Section 13 and 15(d)

Property and Equipment (Details)

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Property and Equipment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment      
Property, plant and equipment, gross $ 312,223 $ 293,637  
Less: Accumulated depreciation and property reserves (205,102) (200,877)  
Total Property Plant & Equipment, net 107,121 92,760  
Depreciation expense 13,500 11,200 $ 11,100
Land and improvements      
Property, Plant and Equipment      
Property, plant and equipment, gross 7,846 7,907  
Buildings      
Property, Plant and Equipment      
Property, plant and equipment, gross 40,515 38,865  
Equipment      
Property, Plant and Equipment      
Property, plant and equipment, gross 96,580 88,472  
Computer hardware and software      
Property, Plant and Equipment      
Property, plant and equipment, gross 125,984 123,725  
Company vehicles      
Property, Plant and Equipment      
Property, plant and equipment, gross $ 41,298 $ 34,668