Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive (Loss) Income [Member] |
Beginning balance at Dec. 31, 2017 | $ 300,170 | $ 282,666 | $ 17,542 | $ (38) |
Beginning balance, shares at Dec. 31, 2017 | | 31,908 | | |
Cumulative effect of accounting change | 15,132 | | 15,132 | |
Net income | 23,846 | | 23,846 | |
Comprehensive income (loss) | 15 | | | 15 |
Dividends declared on common stock ($1.00 per share) | (32,518) | | (32,518) | |
Stock based compensation | 328 | $ 328 | | |
Common stock issued under stock plans, net of shares withheld for employee taxes | 2,071 | $ 2,071 | | |
Common stock issued under stock plans, net of shares withheld for employee taxes, shares | | 394 | | |
Ending balance at Mar. 31, 2018 | 309,044 | $ 285,065 | 24,002 | (23) |
Ending balance, shares at Mar. 31, 2018 | | 32,302 | | |
Beginning balance at Dec. 31, 2017 | 300,170 | $ 282,666 | 17,542 | (38) |
Beginning balance, shares at Dec. 31, 2017 | | 31,908 | | |
Net income | 29,427 | | | |
Comprehensive income (loss) | 21 | | | |
Ending balance at Sep. 30, 2018 | 315,694 | $ 286,128 | 29,583 | (17) |
Ending balance, shares at Sep. 30, 2018 | | 32,325 | | |
Beginning balance at Mar. 31, 2018 | 309,044 | $ 285,065 | 24,002 | (23) |
Beginning balance, shares at Mar. 31, 2018 | | 32,302 | | |
Net income | 2,545 | | 2,545 | |
Comprehensive income (loss) | (10) | | | (10) |
Stock based compensation | 427 | $ 427 | | |
Common stock issued under stock plans, net of shares withheld for employee taxes | 181 | $ 181 | | |
Common stock issued under stock plans, net of shares withheld for employee taxes, shares | | 15 | | |
Ending balance at Jun. 30, 2018 | 312,187 | $ 285,673 | 26,547 | (33) |
Ending balance, shares at Jun. 30, 2018 | | 32,317 | | |
Net income | 3,036 | | 3,036 | |
Comprehensive income (loss) | 16 | | | 16 |
Stock based compensation | 460 | $ 460 | | |
Common stock issued under stock plans, net of shares withheld for employee taxes | (5) | $ (5) | | |
Common stock issued under stock plans, net of shares withheld for employee taxes, shares | | 8 | | |
Ending balance at Sep. 30, 2018 | 315,694 | $ 286,128 | 29,583 | (17) |
Ending balance, shares at Sep. 30, 2018 | | 32,325 | | |
Beginning balance at Dec. 31, 2018 | $ 318,947 | $ 286,597 | 32,373 | (23) |
Beginning balance, shares at Dec. 31, 2018 | 32,325 | 32,325 | | |
Net income | $ 5,974 | | 5,974 | |
Comprehensive income (loss) | 32 | | | 32 |
Stock based compensation | 516 | $ 516 | | |
Common stock issued under stock plans, net of shares withheld for employee taxes | (328) | $ (328) | | |
Common stock issued under stock plans, net of shares withheld for employee taxes, shares | | 63 | | |
Ending balance at Mar. 31, 2019 | 325,141 | $ 286,785 | 38,347 | 9 |
Ending balance, shares at Mar. 31, 2019 | | 32,388 | | |
Beginning balance at Dec. 31, 2018 | $ 318,947 | $ 286,597 | 32,373 | (23) |
Beginning balance, shares at Dec. 31, 2018 | 32,325 | 32,325 | | |
Net income | $ 12,087 | | | |
Comprehensive income (loss) | 32 | | | |
Ending balance at Sep. 30, 2019 | $ 333,893 | $ 289,424 | 44,460 | 9 |
Ending balance, shares at Sep. 30, 2019 | 32,378 | 32,378 | | |
Beginning balance at Mar. 31, 2019 | $ 325,141 | $ 286,785 | 38,347 | 9 |
Beginning balance, shares at Mar. 31, 2019 | | 32,388 | | |
Net income | 2,401 | | 2,401 | |
Comprehensive income (loss) | 14 | | | 14 |
Stock donated to Company (held in treasury) | | (86) | | |
Stock based compensation | 2,558 | $ 2,558 | | |
Common stock issued under stock plans, net of shares withheld for employee taxes | (443) | $ (443) | | |
Common stock issued under stock plans, net of shares withheld for employee taxes, shares | | 72 | | |
Ending balance at Jun. 30, 2019 | 329,671 | $ 288,900 | 40,748 | 23 |
Ending balance, shares at Jun. 30, 2019 | | 32,374 | | |
Net income | 3,712 | | 3,712 | |
Comprehensive income (loss) | (14) | | | (14) |
Stock based compensation | 569 | $ 569 | | |
Common stock issued under stock plans, net of shares withheld for employee taxes | (45) | $ (45) | | |
Common stock issued under stock plans, net of shares withheld for employee taxes, shares | | 4 | | |
Ending balance at Sep. 30, 2019 | $ 333,893 | $ 289,424 | $ 44,460 | $ 9 |
Ending balance, shares at Sep. 30, 2019 | 32,378 | 32,378 | | |