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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)
Balance (in shares) at Dec. 31, 2018   49,630,000      
Balance at Dec. 31, 2018 $ 444,232   $ 47,456 $ 388,496 $ 8,280
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 41,414     41,414  
Other comprehensive gain, net of tax (8,434)       (8,434)
Stock-based compensation (in shares)   184,000      
Stock-based compensation 3,433   3,433    
Stock options exercised (in shares)   29,000      
Stock options exercised 81   81    
Common stock issued 25   25    
Shares retired for settlement of employee taxes upon issuance of vested equity awards (in shares)   (62,000)      
Shares retired for settlement of employee taxes upon issuance of vested equity awards (2,912)   (2,912)    
Common stock issued to acquire non-controlling interest in nTelos (in shares)   76,000      
Balance (in shares) at Sep. 30, 2019   49,857,000      
Balance at Sep. 30, 2019 477,839   48,083 429,910 (154)
Balance (in shares) at Dec. 31, 2018   49,630,000      
Balance at Dec. 31, 2018 $ 444,232   47,456 388,496 8,280
Balance (in shares) at Dec. 31, 2019 49,671,000 49,671,000      
Balance at Dec. 31, 2019 $ 472,428   42,110 430,010 308
Balance (in shares) at Jun. 30, 2019   49,857,000      
Balance at Jun. 30, 2019 464,034   47,138 415,556 1,340
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 14,354     14,354  
Other comprehensive gain, net of tax (1,494)       (1,494)
Stock-based compensation 936   936    
Stock options exercised 0        
Common stock issued 9   9    
Balance (in shares) at Sep. 30, 2019   49,857,000      
Balance at Sep. 30, 2019 $ 477,839   48,083 429,910 (154)
Balance (in shares) at Dec. 31, 2019 49,671,000 49,671,000      
Balance at Dec. 31, 2019 $ 472,428   42,110 430,010 308
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 77,448     77,448  
Other comprehensive gain, net of tax (5,509)       (5,509)
Stock-based compensation (in shares)   152,000      
Stock-based compensation 5,974   5,974    
Common stock issued 23   23    
Shares retired for settlement of employee taxes upon issuance of vested equity awards (in shares)   (47,000)      
Shares retired for settlement of employee taxes upon issuance of vested equity awards $ (2,182)   (2,182)    
Common stock issued to acquire non-controlling interest in nTelos (in shares)   76,000      
Balance (in shares) at Sep. 30, 2020 49,671,000 49,852,000      
Balance at Sep. 30, 2020 $ 548,182   45,925 507,458 (5,201)
Balance (in shares) at Jun. 30, 2020   49,852,000      
Balance at Jun. 30, 2020 511,457   44,659 472,537 (5,739)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 34,921     34,921  
Other comprehensive gain, net of tax 538       538
Stock-based compensation 1,259   1,259    
Common stock issued $ 7   7    
Balance (in shares) at Sep. 30, 2020 49,671,000 49,852,000      
Balance at Sep. 30, 2020 $ 548,182   $ 45,925 $ 507,458 $ (5,201)