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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)

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