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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Shares of Common Stock (no par value)
Additional Paid in Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Change in Accounting Principle - Adoption of ASU 2014-09 $ 56,097     $ 56,097  
Beginning balance (in shares) at Dec. 31, 2017   49,328,000      
Beginning balance at Dec. 31, 2017 350,222   $ 44,787 297,205 $ 8,230
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income (loss) 6,583     6,583  
Other comprehensive gain (loss), net of tax 3,062       3,062
Stock based compensation (in shares)   177,000      
Stock based compensation 2,037   2,037    
Stock options exercised (in shares)   15,000      
Stock options exercised 104   104    
Common stock issued 5   5    
Shares retired for settlement of employee taxes upon issuance of vested equity awards (in shares)   (57,000)      
Shares retired for settlement of employee taxes upon issuance of vested equity awards (1,858)   (1,858)    
Common stock issued to acquire non-controlling interests of nTelos (in shares)   76,000      
Common stock issued to acquire non-controlling interest in nTelos 0        
Ending balance (in shares) at Mar. 31, 2018   49,539,000      
Ending balance at Mar. 31, 2018 $ 416,252   45,075 359,885 11,292
Beginning balance (in shares) at Dec. 31, 2018 49,630,000 49,630,000      
Beginning balance at Dec. 31, 2018 $ 442,247   47,456 386,511 8,280
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income (loss) 13,910     13,910  
Other comprehensive gain (loss), net of tax (2,728)       (2,728)
Stock based compensation (in shares)   167,000      
Stock based compensation 1,802   1,802    
Stock options exercised (in shares)   28,000      
Stock options exercised 175   175    
Common stock issued 8   8    
Shares retired for settlement of employee taxes upon issuance of vested equity awards (in shares)   (57,000)      
Shares retired for settlement of employee taxes upon issuance of vested equity awards (2,800)   (2,800)    
Common stock issued to acquire non-controlling interests of nTelos (in shares)   76,000      
Common stock issued to acquire non-controlling interest in nTelos $ 0        
Ending balance (in shares) at Mar. 31, 2019 49,844,000 49,844,000      
Ending balance at Mar. 31, 2019 $ 452,614   $ 46,641 $ 400,421 $ 5,552