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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

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