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Property and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Property and equipment      
Property and equipment, gross $ 53,740 $ 47,919  
Less: accumulated depreciation (29,115) (26,103)  
Property and equipment, net excluding construction and equipment installations in progress 24,625 21,816  
Property and equipment, net 25,501 25,397  
Depreciation expense 3,200 3,700 $ 3,800
Land and Land Improvements      
Property and equipment      
Property and equipment, gross 8,724 8,724  
Building      
Property and equipment      
Property and equipment, gross 11,579 9,399  
Equipment      
Property and equipment      
Property and equipment, gross 27,953 24,312  
Towers      
Property and equipment      
Property and equipment, gross 5,484 5,484  
Equipment installations in progress      
Property and equipment      
Property and equipment, net $ 876 $ 3,581