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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 | 16,209 |  |  | 16,209 |
Other comprehensive loss, net of tax | 3,895 |  |  |  | 3,895
Stock based compensation (in shares) |  | 205 |  |  |
Stock based compensation | 3,407 |  | 3,407 |  |
Stock options exercised (in shares) |  | 15 |  |  |
Stock options exercised | 104 |  | 104 |  |
Common stock issued | 10 |  | 10 |  |
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 | $ (2,136) |  | (2,136) |  |
Common stock issued to acquire non-controlling interests of nTelos (in shares) | 76 |  |  |  |
Ending balance (in shares) at Jun. 30, 2018 |  | 49,558 |  |  |
Ending balance at Jun. 30, 2018 | $ 427,808 |  | 46,172 | 369,511 | 12,125
Beginning balance (in shares) at Mar. 31, 2018 |  | 49,539 |  |  |
Beginning balance at Mar. 31, 2018 | 416,252 |  | 45,075 | 359,885 | 11,292
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 9,626 |  |  | 9,626 |
Other comprehensive loss, net of tax | 833 |  |  |  | 833
Stock based compensation (in shares) |  | 28 |  |  |
Stock based compensation | 1,370 |  | 1,370 |  |
Common stock issued | 5 |  | 5 |  |
Shares retired for settlement of employee taxes upon issuance of vested equity awards (in shares) |  | (9) |  |  |
Shares retired for settlement of employee taxes upon issuance of vested equity awards | (278) |  | (278) |  |
Ending balance (in shares) at Jun. 30, 2018 |  | 49,558 |  |  |
Ending balance at Jun. 30, 2018 | $ 427,808 |  | 46,172 | 369,511 | 12,125
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 | 27,060 |  |  | 27,060 |
Other comprehensive loss, net of tax | (6,940) |  |  |  | (6,940)
Stock based compensation (in shares) |  | 184 |  |  |
Stock based compensation | 2,497 |  | 2,497 |  |
Stock options exercised (in shares) |  | 29 |  |  |
Stock options exercised | 81 |  | 81 |  |
Common stock issued | 16 |  | 16 |  |
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 Jun. 30, 2019 | 49,857 | 49,857 |  |  |
Ending balance at Jun. 30, 2019 | $ 462,049 |  | 47,138 | 413,571 | 1,340
Beginning balance (in shares) at Mar. 31, 2019 |  | 49,844 |  |  |
Beginning balance at Mar. 31, 2019 | 452,614 |  | 46,641 | 400,421 | 5,552
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 13,150 |  |  | 13,150 |
Other comprehensive loss, net of tax | (4,212) |  |  |  | (4,212)
Stock based compensation (in shares) |  | 17 |  |  |
Stock based compensation | 695 |  | 695 |  |
Stock options exercised (in shares) |  | 1 |  |  |
Stock options exercised | (94) |  | (94) |  |
Common stock issued | 8 |  | 8 |  |
Shares retired for settlement of employee taxes upon issuance of vested equity awards (in shares) |  | (5) |  |  |
Shares retired for settlement of employee taxes upon issuance of vested equity awards | $ (112) |  | (112) |  |
Ending balance (in shares) at Jun. 30, 2019 | 49,857 | 49,857 |  |  |
Ending balance at Jun. 30, 2019 | $ 462,049 |  | $ 47,138 | $ 413,571 | $ 1,340

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