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Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands | Total | Common Stock [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
--- | --- | --- | --- | ---
Balance at Dec. 31, 2014 | $ 424,531 | $ 106,469 | $ 318,164 | $ (102)
Balance, Shares at Dec. 31, 2014 |  | 26,051,000 |  |
Net income | 40,470 |  | 40,470 |
Share-based compensation | 3,399 | $ 3,399 |  |
Common stock issued under stock plans, net of shares withheld for employee taxes | 2,149 | $ 2,149 |  |
Common stock issued under stock Plans, net of shares withheld for employee taxes, Shares |  | 208,000 |  |
Common stock repurchased | (63,953) | $ (9,119) | (54,834) |
Common stock repurchased, Shares |  | (2,408,000) |  |
Tax shortfall from equity awards | (292) | $ (292) |  |
Taxes paid related to net share settlement of stock awards | (1,560) | (1,560) |  |
Dividends accrued of $1.00, $1.02, $1.04 per share in 2015, 2016 and 2017 | (25,092) |  | (25,092) |
Other comprehensive (loss) gain | 35 |  |  | 35
Balance at Dec. 31, 2015 | 379,687 | $ 101,046 | 278,708 | (67)
Balance, Shares at Dec. 31, 2015 |  | 23,851,000 |  |
Net income | 6,566 |  |  |
Balance at Mar. 31, 2016 | 380,512 |  |  |
Balance at Dec. 31, 2015 | 379,687 | $ 101,046 | 278,708 | (67)
Balance, Shares at Dec. 31, 2015 |  | 23,851,000 |  |
Net income | 38,251 |  | 38,251 |
Share-based compensation | 3,091 | $ 3,091 |  |
Common stock issued under stock plans, net of shares withheld for employee taxes | $ 37 | $ 37 |  |
Common stock issued under stock Plans, net of shares withheld for employee taxes, Shares |  | 97,000 |  |
Common stock repurchased, Shares | 0 |  |  |
Tax shortfall from equity awards | $ (1,066) | $ (1,066) |  |
Taxes paid related to net share settlement of stock awards | (1,287) | (1,287) |  |
Dividends accrued of $1.00, $1.02, $1.04 per share in 2015, 2016 and 2017 | (24,438) |  | (24,438) |
Other comprehensive (loss) gain | 12 |  |  | 12
Balance at Dec. 31, 2016 | $ 394,287 | $ 101,821 | 292,521 | (55)
Balance, Shares at Dec. 31, 2016 | 23,948,000 | 23,948,000 |  |
Balance at Mar. 31, 2016 | $ 380,512 |  |  |
Net income | 9,079 |  |  |
Balance at Jun. 30, 2016 | 383,313 |  |  |
Net income | 12,872 |  |  |
Balance at Sep. 30, 2016 | 390,600 |  |  |
Net income | 9,734 |  |  |
Balance at Dec. 31, 2016 | $ 394,287 | $ 101,821 | 292,521 | (55)
Balance, Shares at Dec. 31, 2016 | 23,948,000 | 23,948,000 |  |
Net income | $ 7,973 |  |  |
Balance at Mar. 31, 2017 | 396,625 |  |  |
Balance at Dec. 31, 2016 | $ 394,287 | $ 101,821 | 292,521 | (55)
Balance, Shares at Dec. 31, 2016 | 23,948,000 | 23,948,000 |  |
Net income | $ 153,920 |  | 153,920 |
Share-based compensation | $ 3,198 | $ 3,198 |  |
Common stock issued under stock Plans, net of shares withheld for employee taxes, Shares |  | 104,000 |  |
Common stock repurchased, Shares | 0 |  |  |
Taxes paid related to net share settlement of stock awards | $ (2,072) | $ (2,072) |  |
Dividends accrued of $1.00, $1.02, $1.04 per share in 2015, 2016 and 2017 | (25,036) |  | (25,036) |
Other comprehensive (loss) gain | (113) |  |  | (113)
Balance at Dec. 31, 2017 | $ 524,184 | $ 102,947 | 421,405 | (168)
Balance, Shares at Dec. 31, 2017 | 24,052,000 | 24,052,000 |  |
Balance at Mar. 31, 2017 | $ 396,625 |  |  |
Net income | 11,461 |  |  |
Balance at Jun. 30, 2017 | 402,365 |  |  |
Net income | 16,762 |  |  |
Balance at Sep. 30, 2017 | 412,782 |  |  |
Net income | 117,724 |  |  |
Balance at Dec. 31, 2017 | $ 524,184 | $ 102,947 | $ 421,405 | $ (168)
Balance, Shares at Dec. 31, 2017 | 24,052,000 | 24,052,000 |  |

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