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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Common stock | Additional Paid-in Capital | Accumulated Deficit | Treasury Stock
--- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Effect of adoption of topic 606 | Effect of adoption of topic 606 | $ 2,131 |  |  | $ 2,131 | $ 0
Beginning balance, shares outstanding at Dec. 31, 2017 |  | 16,098,000 |  |  |
Beginning balance, shares outstanding (Effect of adoption of topic 606) at Dec. 31, 2017 |  | 16,098,000 |  |  |
Beginning Balance at Dec. 31, 2017 | 197,656 | $ 226 | $ 216,158 | 57,904 | (76,632)
Beginning Balance (Effect of adoption of topic 606) at Dec. 31, 2017 | 199,787 | $ 226 | 216,158 | 60,035 | (76,632)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net Income (Loss) | 9,356 |  |  | 9,356 |
Isuuance of common stock, shares |  | 91,000 |  |  |
Issuance of common stock |  | $ 1 | 307 |  |
Exercise of stock options, shares |  | 112,000 |  |  |
Exercise of stock options | 320 | $ 1 | 319 |  |
Cancellation and retirement of restricted common stock, shares |  | (15,000) |  |  |
Cancellation and retirement of restricted common stock and stock options | (296) | $ 0 | (296) |  |
Stock-based compensation expense | 1,100 |  | 1,100 |  |
Dividends on common stock | (1,207) |  | (1,207) |  |
Other, shares |  | 6,000 |  |  |
Other | 145 |  | 145 |  |
Ending balance, shares outstanding at Mar. 31, 2018 |  | 16,292,000 |  |  |
Ending Balance at Mar. 31, 2018 | 209,513 | $ 228 | 216,526 | 69,391 | (76,632)
Beginning balance, shares outstanding at Dec. 31, 2017 |  | 16,098,000 |  |  |
Beginning balance, shares outstanding (Effect of adoption of topic 606) at Dec. 31, 2017 |  | 16,098,000 |  |  |
Beginning Balance at Dec. 31, 2017 | 197,656 | $ 226 | 216,158 | 57,904 | (76,632)
Beginning Balance (Effect of adoption of topic 606) at Dec. 31, 2017 | 199,787 | $ 226 | 216,158 | 60,035 | (76,632)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Issuance of common stock | 308 |  |  |  |
Ending balance, shares outstanding at Jun. 30, 2018 |  | 19,153,000 |  |  |
Ending Balance at Jun. 30, 2018 | 239,978 | $ 257 | 244,215 | 72,138 | (76,632)
Beginning balance, shares outstanding at Mar. 31, 2018 |  | 16,292,000 |  |  |
Beginning Balance at Mar. 31, 2018 | 209,513 | $ 228 | 216,526 | 69,391 | (76,632)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net Income (Loss) | 2,747 |  |  | 2,747 |
Isuuance of common stock, shares |  | 13,000 |  |  |
Issuance of common stock | 220 |  | 220 |  |
Exercise of stock options, shares |  | 27,000 |  |  |
Exercise of stock options | (196) | $ 1 | (197) |  |
Cancellation and retirement of restricted common stock, shares |  | (2,000) |  |  |
Cancellation and retirement of restricted common stock and stock options | (4) |  | (4) |  |
Stock-based compensation expense | 909 |  | 909 |  |
Dividends on common stock | (1,433) |  | (1,433) |  |
Convertible notes exchange, shares |  | 2,823,000 |  |  |
Convertible notes exchange | 28,222 | $ 28 | 28,194 |  |
Ending balance, shares outstanding at Jun. 30, 2018 |  | 19,153,000 |  |  |
Ending Balance at Jun. 30, 2018 | 239,978 | $ 257 | 244,215 | 72,138 | (76,632)
Beginning balance, shares outstanding at Dec. 31, 2018 |  | 18,078,000 |  |  |
Beginning Balance at Dec. 31, 2018 | 221,492 | $ 257 | 243,849 | 71,680 | (94,294)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net Income (Loss) | 6,525 |  |  | 6,525 |
Isuuance of common stock, shares |  | 48,000 |  |  |
Issuance of common stock | 275 | $ 0 | 275 |  |
Exercise of stock options, shares |  | 71,000 |  |  |
Exercise of stock options | 472 | $ 1 | 471 |  |
Issuance of restricted common stock, shares |  | 0 |  |  |
Issuance of restricted common stock | 0 | $ 0 | 0 |  |
Cancellation and retirement of restricted common stock, shares |  | (9,000) |  |  |
Cancellation and retirement of restricted common stock and stock options | (174) | $ 0 | (174) |  |
Stock-based compensation expense | 585 |  | 585 |  |
Dividends on common stock | (1,360) |  | (1,360) |  |
Other, shares |  | 15,000 |  |  |
Other | 294 |  | 294 |  |
Ending balance, shares outstanding at Mar. 31, 2019 |  | 18,203,000 |  |  |
Ending Balance at Mar. 31, 2019 | 228,109 | $ 258 | 243,940 | 78,205 | (94,294)
Beginning balance, shares outstanding at Dec. 31, 2018 |  | 18,078,000 |  |  |
Beginning Balance at Dec. 31, 2018 | $ 221,492 | $ 257 | 243,849 | 71,680 | (94,294)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Treasury stock acquired, shares | (400,000) |  |  |  |
Ending balance, shares outstanding at Jun. 30, 2019 |  | 17,812,000 |  |  |
Ending Balance at Jun. 30, 2019 | $ 224,560 | $ 258 | 243,285 | 83,067 | (102,050)
Beginning balance, shares outstanding at Mar. 31, 2019 |  | 18,203,000 |  |  |
Beginning Balance at Mar. 31, 2019 | 228,109 | $ 258 | 243,940 | 78,205 | (94,294)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net Income (Loss) | 4,862 |  |  | 4,862 |
Isuuance of common stock, shares |  | 17,000 |  |  |
Issuance of common stock | 197 |  | 197 |  |
Cancellation and retirement of restricted common stock, shares |  | (8,000) |  |  |
Cancellation and retirement of restricted common stock and stock options | (5) |  | (5) |  |
Stock-based compensation expense | 518 |  | 518 |  |
Dividends on common stock | (1,365) |  | (1,365) |  |
Treasury stock acquired, shares |  | (400,000) |  |  |
Treasury stock acquired | (7,756) |  |  |  | (7,756)
Ending balance, shares outstanding at Jun. 30, 2019 |  | 17,812,000 |  |  |
Ending Balance at Jun. 30, 2019 | $ 224,560 | $ 258 | $ 243,285 | $ 83,067 | $ (102,050)

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