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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Shares of Common Stock (no par value)
Additional Paid in Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Beginning balance (in shares) at Dec. 31, 2017   49,328      
Beginning balance at Dec. 31, 2017 $ 350,222   $ 44,787 $ 297,205 $ 8,230
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 31,743     31,743  
Other comprehensive gain (loss), net of tax 4,360       4,360
Stock based compensation (in shares)   206      
Stock based compensation 4,578   4,578    
Stock options exercised (in shares)   15      
Stock options exercised 104   104    
Common stock issued 18   18    
Shares retired for settlement of employee taxes upon issuance of vested equity awards (in shares)   (66)      
Shares retired for settlement of employee taxes upon issuance of vested equity awards $ (2,137)   (2,137)    
Common stock issued to acquire non-controlling interests of nTelos (in shares) 76        
Ending balance (in shares) at Sep. 30, 2018   49,559      
Ending balance at Sep. 30, 2018 $ 444,985   47,350 385,045 12,590
Beginning balance (in shares) at Jun. 30, 2018   49,558      
Beginning balance at Jun. 30, 2018 427,808   46,172 369,511 12,125
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 15,534     15,534  
Other comprehensive gain (loss), net of tax 465       465
Stock based compensation (in shares)   1      
Stock based compensation 1,171   1,171    
Common stock issued 8   8    
Shares retired for settlement of employee taxes upon issuance of vested equity awards (in shares)   0      
Shares retired for settlement of employee taxes upon issuance of vested equity awards (1)   (1)    
Ending balance (in shares) at Sep. 30, 2018   49,559      
Ending balance at Sep. 30, 2018 $ 444,985   47,350 385,045 12,590
Beginning balance (in shares) at Dec. 31, 2018 49,630 49,630      
Beginning balance at Dec. 31, 2018 $ 442,247   47,456 386,511 8,280
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 41,414     41,414  
Other comprehensive gain (loss), net of tax (8,434)       (8,434)
Stock based compensation (in shares)   184      
Stock based compensation 3,433   3,433    
Stock options exercised (in shares)   29      
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)      
Shares retired for settlement of employee taxes upon issuance of vested equity awards $ (2,912)   (2,912)    
Common stock issued to acquire non-controlling interests of nTelos (in shares) 76        
Ending balance (in shares) at Sep. 30, 2019 49,857 49,857      
Ending balance at Sep. 30, 2019 $ 475,854   48,083 427,925 (154)
Beginning balance (in shares) at Jun. 30, 2019   49,857      
Beginning balance at Jun. 30, 2019 462,049   47,138 413,571 1,340
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 14,354     14,354  
Other comprehensive gain (loss), net of tax (1,494)       (1,494)
Stock based compensation 936   936    
Common stock issued $ 9   9    
Ending balance (in shares) at Sep. 30, 2019 49,857 49,857      
Ending balance at Sep. 30, 2019 $ 475,854   $ 48,083 $ 427,925 $ (154)