CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY Statement - USD ($) $ in Thousands | Total | Common Stock [Member] | Treasury Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] |
Stockholders' equity beginning of period at Dec. 31, 2018 | $ 874,659 | $ 677 | $ (8,458) | $ 672,095 | $ 210,345 |
Common stock issued beginning of period (shares) at Dec. 31, 2018 | | 67,708,000 | | | |
Treasury stock beginning of period (shares) at Dec. 31, 2018 | | | 478,000 | | |
Stockholders' Equity [Abstract] | | | | | |
Exercise of stock options | 132 | $ 0 | | 132 | |
Exercise of stock options (shares) | | 8,000 | | | |
Shares vested for long-term incentive plan | 0 | $ 3 | | (3) | |
Shares vested for long-term incentive plan (shares) | | 290,000 | | | |
Repurchases of common stock under share repurchase program | (15,709) | | $ (15,709) | | |
Repurchases of common stock under share repurchase program (shares) | | | 920,000 | | |
Repurchases of common stock equity related to equity award activity | (1,330) | | $ (1,330) | | |
Repurchases of common stock related to equity award activity (shares) | | | 74,000 | | |
Stock compensation expense | 2,915 | | | 2,915 | |
Net income | 20,350 | | | | 20,350 |
Stockholders' equity end of period at Mar. 31, 2019 | 881,017 | $ 680 | $ (25,497) | 675,139 | 230,695 |
Common stock issued end of period (shares) at Mar. 31, 2019 | | 68,006,000 | | | |
Treasury stock end of period (shares) at Mar. 31, 2019 | | | 1,472,000 | | |
Stockholders' equity beginning of period at Dec. 31, 2018 | 874,659 | $ 677 | $ (8,458) | 672,095 | 210,345 |
Common stock issued beginning of period (shares) at Dec. 31, 2018 | | 67,708,000 | | | |
Treasury stock beginning of period (shares) at Dec. 31, 2018 | | | 478,000 | | |
Stockholders' Equity [Abstract] | | | | | |
Repurchases of common stock under share repurchase program | $ (16,400) | | | | |
Repurchases of common stock under share repurchase program (shares) | 1,000,000 | | | | |
Net income | $ 56,049 | | | | |
Stockholders' equity end of period at Jun. 30, 2019 | 919,619 | $ 682 | $ (26,371) | 678,914 | 266,394 |
Common stock issued end of period (shares) at Jun. 30, 2019 | | 68,155,000 | | | |
Treasury stock end of period (shares) at Jun. 30, 2019 | | | 1,519,000 | | |
Stockholders' equity beginning of period at Mar. 31, 2019 | 881,017 | $ 680 | $ (25,497) | 675,139 | 230,695 |
Common stock issued beginning of period (shares) at Mar. 31, 2019 | | 68,006,000 | | | |
Treasury stock beginning of period (shares) at Mar. 31, 2019 | | | 1,472,000 | | |
Stockholders' Equity [Abstract] | | | | | |
Exercise of stock options | 529 | $ 1 | | 528 | |
Exercise of stock options (shares) | | 76,000 | | | |
Shares vested for long-term incentive plan | 0 | $ 1 | | (1) | |
Shares vested for long-term incentive plan (shares) | | 73,000 | | | |
Repurchases of common stock under share repurchase program | $ (737) | | $ (737) | | |
Repurchases of common stock under share repurchase program (shares) | 100,000 | | 41,000 | | |
Repurchases of common stock equity related to equity award activity | $ (137) | | $ (137) | | |
Repurchases of common stock related to equity award activity (shares) | | | 6,000 | | |
Stock compensation expense | 3,248 | | | 3,248 | |
Net income | 35,699 | | | | 35,699 |
Stockholders' equity end of period at Jun. 30, 2019 | 919,619 | $ 682 | $ (26,371) | 678,914 | 266,394 |
Common stock issued end of period (shares) at Jun. 30, 2019 | | 68,155,000 | | | |
Treasury stock end of period (shares) at Jun. 30, 2019 | | | 1,519,000 | | |
Stockholders' equity beginning of period at Dec. 31, 2019 | $ 981,512 | $ 683 | $ (26,616) | 687,255 | 320,190 |
Common stock issued beginning of period (shares) at Dec. 31, 2019 | 68,300,000 | 68,306,000 | | | |
Treasury stock beginning of period (shares) at Dec. 31, 2019 | 1,500,000 | | 1,528,000 | | |
Stockholders' Equity [Abstract] | | | | | |
Exercise of stock options | $ 206 | $ 0 | | 206 | |
Exercise of stock options (shares) | | 13,000 | | | |
Shares vested for long-term incentive plan | 0 | $ 4 | | (4) | |
Shares vested for long-term incentive plan (shares) | | 402,000 | | | |
Repurchases of common stock under share repurchase program | (1,416) | | $ (1,416) | | |
Repurchases of common stock under share repurchase program (shares) | | | 87,000 | | |
Repurchases of common stock equity related to equity award activity | (2,441) | | $ (2,441) | | |
Repurchases of common stock related to equity award activity (shares) | | | 122,000 | | |
Stock compensation expense | 3,170 | | | 3,170 | |
Net income | 22,029 | | | | 22,029 |
Stockholders' equity end of period at Mar. 31, 2020 | 1,003,060 | $ 687 | $ (30,473) | 690,627 | 342,219 |
Common stock issued end of period (shares) at Mar. 31, 2020 | | 68,721,000 | | | |
Treasury stock end of period (shares) at Mar. 31, 2020 | | | 1,737,000 | | |
Stockholders' equity beginning of period at Dec. 31, 2019 | $ 981,512 | $ 683 | $ (26,616) | 687,255 | 320,190 |
Common stock issued beginning of period (shares) at Dec. 31, 2019 | 68,300,000 | 68,306,000 | | | |
Treasury stock beginning of period (shares) at Dec. 31, 2019 | 1,500,000 | | 1,528,000 | | |
Stockholders' Equity [Abstract] | | | | | |
Repurchases of common stock under share repurchase program | $ (1,400) | | | | |
Repurchases of common stock under share repurchase program (shares) | 100,000 | | | | |
Net income | $ 65,651 | | | | |
Stockholders' equity end of period at Jun. 30, 2020 | $ 1,050,064 | $ 688 | $ (30,578) | 694,113 | 385,841 |
Common stock issued end of period (shares) at Jun. 30, 2020 | 68,800,000 | 68,805,000 | | | |
Treasury stock end of period (shares) at Jun. 30, 2020 | 1,700,000 | | 1,743,000 | | |
Stockholders' equity beginning of period at Mar. 31, 2020 | $ 1,003,060 | $ 687 | $ (30,473) | 690,627 | 342,219 |
Common stock issued beginning of period (shares) at Mar. 31, 2020 | | 68,721,000 | | | |
Treasury stock beginning of period (shares) at Mar. 31, 2020 | | | 1,737,000 | | |
Stockholders' Equity [Abstract] | | | | | |
Exercise of stock options | 159 | $ 0 | | 159 | |
Exercise of stock options (shares) | | 9,000 | | | |
Shares vested for long-term incentive plan | $ 0 | $ 1 | | (1) | |
Shares vested for long-term incentive plan (shares) | | 75,000 | | | |
Repurchases of common stock under share repurchase program (shares) | 0 | | | | |
Repurchases of common stock equity related to equity award activity | $ (105) | | $ (105) | | |
Repurchases of common stock related to equity award activity (shares) | | | 6,000 | | |
Stock compensation expense | 3,328 | | | 3,328 | |
Net income | 43,622 | | | | 43,622 |
Stockholders' equity end of period at Jun. 30, 2020 | $ 1,050,064 | $ 688 | $ (30,578) | $ 694,113 | $ 385,841 |
Common stock issued end of period (shares) at Jun. 30, 2020 | 68,800,000 | 68,805,000 | | | |
Treasury stock end of period (shares) at Jun. 30, 2020 | 1,700,000 | | 1,743,000 | | |