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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
--- | --- | --- | --- | --- | ---
Beginning balance, shares outstanding at Dec. 31, 2015 |  | 16,648,000 |  |  |
Beginning Balance at Dec. 31, 2015 | $ 155,339 | $ 225 | $ 214,250 | $ 1,130 | $ (60,266)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net Income (Loss) | 19,581 |  |  | 19,581 |
Isuuance of common stock, shares |  | 45,000 |  |  |
Issuance of common stock | $ 872 | $ 0 | 872 |  |
Exercise of stock options, shares | 112,000 | 48,000 |  |  |
Exercise of stock options | $ 1 | $ 1 | 0 |  |
Issuance of restricted common stock, shares |  | 18,000 |  |  |
Issuance of restricted common stock | 12 | $ 0 | 12 |  |
Cancellation and retirement of restricted common stock, shares |  | (118,000) |  |  |
Cancellation and retirement of restricted common stock | (889) | $ (1) | (888) |  |
Stock-based compensation expense | 3,526 |  | 3,526 |  |
Dividends on common stock | (2,492) |  | (2,492) |  |
Treasury stock acquired | (216) |  | (216) |  |
Ending balance, shares outstanding at Dec. 31, 2016 |  | 16,641,000 |  |  |
Ending Balance at Dec. 31, 2016 | 175,734 | $ 225 | 215,064 | 20,711 | (60,266)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net Income (Loss) | 37,193 |  |  | 37,193 |
Isuuance of common stock, shares |  | 68,000 |  |  |
Issuance of common stock | $ 1,638 | $ 1 | 1,637 |  |
Exercise of stock options, shares | 159,000 | 61,000 |  |  |
Exercise of stock options | $ 514 | $ 0 | 514 |  |
Issuance of restricted common stock, shares |  | 27,000 |  |  |
Issuance of restricted common stock | 0 | $ 0 | 0 |  |
Cancellation and retirement of restricted common stock, shares |  | (25,000) |  |  |
Cancellation and retirement of restricted common stock | (551) | $ 0 | (551) |  |
Stock-based compensation expense | 3,203 |  | 3,203 |  |
Dividends on common stock | $ (3,709) |  | (3,709) |  |
Treasury stock acquired, shares | (574,054) | 674,000 |  |  |
Dividends on common stock | $ (16,366) |  |  |  | (16,366)
Ending balance, shares outstanding at Dec. 31, 2017 |  | 16,098,000 |  |  |
Ending balance, shares outstanding (Accounting Standards Update 2014-09 [Member]) at Dec. 31, 2017 |  | 16,098,000 |  |  |
Ending Balance at Dec. 31, 2017 | 197,656 | $ 226 | 216,158 | 57,904 | (76,632)
Ending Balance (Accounting Standards Update 2014-09 [Member]) at Dec. 31, 2017 | 199,787 | $ 226 | 216,158 | 60,035 | (76,632)
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2014-09 [Member] | 2,131 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net Income (Loss) | 11,645 |  |  | 11,645 |
Isuuance of common stock, shares |  | 62,000 |  |  |
Issuance of common stock | $ 1,200 | $ 1 | 1,199 |  |
Exercise of stock options, shares | 459,000 | 140,000 |  |  |
Exercise of stock options | $ (33) | $ 1 | (34) |  |
Issuance of restricted common stock, shares |  | 87,000 |  |  |
Issuance of restricted common stock | 25 | $ 1 | 24 |  |
Cancellation and retirement of restricted common stock, shares |  | (30,000) |  |  |
Cancellation and retirement of restricted common stock | (398) | $ 0 | (398) |  |
Stock-based compensation expense | 6,531 |  | 6,531 |  |
Dividends on common stock | (5,514) |  | (5,514) |  |
Stock Issued During Period, Shares, Conversion of Convertible Securities |  | 2,823,000 |  |  |
Stock Issued During Period, Value, Conversion of Convertible Securities | $ 25,911 | $ 28 | 25,883 |  |
Treasury stock acquired, shares | (1,101,969) | (1,102,000) |  |  |
Dividends on common stock | $ (17,662) |  |  |  | (17,662)
Ending balance, shares outstanding at Dec. 31, 2018 |  | 18,078,000 |  |  |
Ending Balance at Dec. 31, 2018 | 221,492 | $ 257 | $ 243,849 | 71,680 | $ (94,294)
Ending Balance (Out-of-period Immaterial Adjustment [Member]) at Dec. 31, 2018 | $ 2,255 |  |  | $ 2,255 |

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