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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Common Stock Cumulative Effect, Period of Adoption, as Adjusted | Common Stock | Retained Earnings Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings Cumulative Effect, Period of Adoption, as Adjusted | Retained Earnings | Treasury Stock Cumulative Effect, Period of Adoption, as Adjusted | Treasury Stock | Accumulated Other Comprehensive Income (Loss) Cumulative Effect, Period of Adoption, as Adjusted | Accumulated Other Comprehensive Income (Loss) | Cumulative Effect, Period of Adoption, Adjustment | Cumulative Effect, Period of Adoption, as Adjusted | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2018 | $ 690,910 | $ 690,910 | $ (13,141) | $ 1,763,444 | $ 1,776,585 | $ (503,182) | $ (503,182) | $ (32) | $ (32) | $ (13,141) | $ 1,951,140 | $ 1,964,281
Balance (in shares) at Dec. 31, 2018 | 81,239 | 81,239 |  |  |  | (29,851) | (29,851) |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  | 88,181 |  |  |  |  |  |  | 88,181
Net unrealized depreciation on marketable securities, net of tax |  |  |  |  |  |  |  |  | 32 |  |  | 32
Exercise of common stock options and stock issued under equity award plan |  | $ 641 |  |  |  |  |  |  |  |  |  | 641
Exercise of common stock options and stock issued under equity award plan (in shares) |  | 521 |  |  |  |  |  |  |  |  |  |
Sale of common stock under employee stock purchase plan |  | $ 1,620 |  |  |  |  |  |  |  |  |  | 1,620
Sale of common stock under employee stock purchase plan (in shares) |  | 39 |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense associated with equity awards, net of forfeitures |  | $ (578) |  |  |  |  |  |  |  |  |  | (578)
Treasury shares acquired from vested employee stock awards for income tax withholdings |  |  |  |  |  |  | $ (9,311) |  |  |  |  | (9,311)
Treasury shares acquired from vested employee stock awards for income tax withholdings (in shares) |  |  |  |  |  |  | (173) |  |  |  |  |
Treasury stock purchases |  |  |  |  |  |  | $ (25,000) |  |  |  |  | (25,000)
Treasury stock purchases (in shares) |  |  |  |  |  |  | (476) |  |  |  |  |
Cash dividends declared |  |  |  |  | (6,158) |  |  |  |  |  |  | (6,158)
Balance at Mar. 31, 2019 |  | $ 692,593 |  |  | 1,845,467 |  | $ (537,493) |  |  |  |  | 2,000,567
Balance (in shares) at Mar. 31, 2019 |  | 81,799 |  |  |  |  | (30,500) |  |  |  |  |
Balance at Dec. 31, 2018 | $ 690,910 | $ 690,910 | (13,141) | 1,763,444 | 1,776,585 | $ (503,182) | $ (503,182) | $ (32) | (32) | (13,141) | 1,951,140 | 1,964,281
Balance (in shares) at Dec. 31, 2018 | 81,239 | 81,239 |  |  |  | (29,851) | (29,851) |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  |  | 267,572
Balance at Sep. 30, 2019 |  | $ 684,541 |  |  | 2,012,691 |  | $ (580,972) |  |  |  |  | 2,116,260
Balance (in shares) at Sep. 30, 2019 |  | 81,743 |  |  |  |  | (31,253) |  |  |  |  |
Balance at Mar. 31, 2019 |  | $ 692,593 |  |  | 1,845,467 |  | $ (537,493) |  |  |  |  | 2,000,567
Balance (in shares) at Mar. 31, 2019 |  | 81,799 |  |  |  |  | (30,500) |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  | 88,052 |  |  |  |  |  |  | 88,052
Exercise of common stock options and stock issued under equity award plan |  | $ 2,279 |  |  |  |  |  |  |  |  |  | 2,279
Exercise of common stock options and stock issued under equity award plan (in shares) |  | 172 |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense associated with equity awards, net of forfeitures |  | $ 2,075 |  |  |  |  |  |  |  |  |  | 2,075
Treasury stock purchases |  |  |  |  |  |  | $ (18,476) |  |  |  |  | (18,476)
Treasury stock purchases (in shares) |  |  |  |  |  |  | (311) |  |  |  |  |
Common stock purchased and cancelled |  | $ (16,145) |  |  |  |  |  |  |  |  |  | (16,145)
Common stock purchased and cancelled (in shares) |  | (268) |  |  |  |  |  |  |  |  |  |
Cash dividends declared |  |  |  |  | (6,107) |  |  |  |  |  |  | (6,107)
Balance at Jun. 30, 2019 |  | $ 680,802 |  |  | 1,927,412 |  | $ (555,969) |  |  |  |  | 2,052,245
Balance (in shares) at Jun. 30, 2019 |  | 81,703 |  |  |  |  | (30,811) |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  | 91,339 |  |  |  |  |  |  | 91,339
Exercise of common stock options and stock issued under equity award plan |  | $ 185 |  |  |  |  |  |  |  |  |  | 185
Exercise of common stock options and stock issued under equity award plan (in shares) |  | 13 |  |  |  |  |  |  |  |  |  |
Sale of common stock under employee stock purchase plan |  | $ 1,545 |  |  |  |  |  |  |  |  |  | 1,545
Sale of common stock under employee stock purchase plan (in shares) |  | 27 |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense associated with equity awards, net of forfeitures |  | $ 2,009 |  |  |  |  |  |  |  |  |  | 2,009
Treasury stock purchases |  |  |  |  |  |  | $ (25,003) |  |  |  |  | (25,003)
Treasury stock purchases (in shares) |  |  |  |  |  |  | (442) |  |  |  |  |
Cash dividends declared |  |  |  |  | (6,060) |  |  |  |  |  |  | (6,060)
Balance at Sep. 30, 2019 |  | $ 684,541 |  |  | 2,012,691 |  | $ (580,972) |  |  |  |  | 2,116,260
Balance (in shares) at Sep. 30, 2019 |  | 81,743 |  |  |  |  | (31,253) |  |  |  |  |
Balance at Dec. 31, 2019 | $ 686,806 | $ 686,806 | (11,639) | 2,067,540 | 2,079,179 | $ (590,971) | $ (590,971) |  |  | (11,639) | 2,163,375 | 2,175,014
Balance (in shares) at Dec. 31, 2019 | 81,743 | 81,743 |  |  |  | (31,420) | (31,420) |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  | 29,988 |  |  |  |  |  |  | 29,988
Exercise of common stock options and stock issued under equity award plan |  | $ 38 |  |  |  |  |  |  |  |  |  | 38
Exercise of common stock options and stock issued under equity award plan (in shares) |  | 287 |  |  |  |  |  |  |  |  |  |
Sale of common stock under employee stock purchase plan |  | $ 1,494 |  |  |  |  |  |  |  |  |  | 1,494
Sale of common stock under employee stock purchase plan (in shares) |  | 24 |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense associated with equity awards, net of forfeitures |  | $ 1,727 |  |  |  |  |  |  |  |  |  | 1,727
Treasury shares acquired from vested employee stock awards for income tax withholdings |  |  |  |  |  |  | $ (6,165) |  |  |  |  | (6,165)
Treasury shares acquired from vested employee stock awards for income tax withholdings (in shares) |  |  |  |  |  |  | (108) |  |  |  |  |
Treasury stock purchases |  |  |  |  |  |  | $ (20,000) |  |  |  |  | (20,000)
Treasury stock purchases (in shares) |  |  |  |  |  |  | (386) |  |  |  |  |
Cash dividends declared |  |  |  |  | (7,019) |  |  |  |  |  |  | (7,019)
Balance at Mar. 31, 2020 |  | $ 690,065 |  |  | 2,090,509 |  | $ (617,136) |  |  |  |  | 2,163,438
Balance (in shares) at Mar. 31, 2020 |  | 82,054 |  |  |  |  | (31,914) |  |  |  |  |
Balance at Dec. 31, 2019 | $ 686,806 | $ 686,806 | $ (11,639) | $ 2,067,540 | 2,079,179 | $ (590,971) | $ (590,971) |  |  | $ (11,639) | $ 2,163,375 | 2,175,014
Balance (in shares) at Dec. 31, 2019 | 81,743 | 81,743 |  |  |  | (31,420) | (31,420) |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  |  | 37,935
CARES Act warrant issuance |  |  |  |  |  |  |  |  |  |  |  | 8,248
Balance at Sep. 30, 2020 |  | $ 703,780 |  |  | 2,098,456 |  | $ (617,136) |  |  |  |  | 2,185,100
Balance (in shares) at Sep. 30, 2020 |  | 82,095 |  |  |  |  | (31,914) |  |  |  |  |
Balance at Mar. 31, 2020 |  | $ 690,065 |  |  | 2,090,509 |  | $ (617,136) |  |  |  |  | 2,163,438
Balance (in shares) at Mar. 31, 2020 |  | 82,054 |  |  |  |  | (31,914) |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  | (25,715) |  |  |  |  |  |  | (25,715)
Net unrealized appreciation on marketable securities, net of tax |  |  |  |  |  |  |  |  | 307 |  |  | 307
Stock-based compensation expense associated with equity awards, net of forfeitures |  | $ 2,087 |  |  |  |  |  |  |  |  |  | 2,087
CARES Act warrant issuance |  | 2,845 |  |  |  |  |  |  |  |  |  | 2,845
Balance at Jun. 30, 2020 |  | $ 694,997 |  |  | 2,064,794 |  | $ (617,136) |  | 307 |  |  | 2,142,962
Balance (in shares) at Jun. 30, 2020 |  | 82,054 |  |  |  |  | (31,914) |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  | 33,662 |  |  |  |  |  |  | 33,662
Net unrealized depreciation on marketable securities, net of tax |  |  |  |  |  |  |  |  | $ (307) |  |  | (307)
Sale of common stock under employee stock purchase plan |  | $ 1,287 |  |  |  |  |  |  |  |  |  | 1,287
Sale of common stock under employee stock purchase plan (in shares) |  | 41 |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense associated with equity awards, net of forfeitures |  | $ 2,093 |  |  |  |  |  |  |  |  |  | 2,093
CARES Act warrant issuance |  | 5,403 |  |  |  |  |  |  |  |  |  | 5,403
Balance at Sep. 30, 2020 |  | $ 703,780 |  |  | $ 2,098,456 |  | $ (617,136) |  |  |  |  | $ 2,185,100
Balance (in shares) at Sep. 30, 2020 |  | 82,095 |  |  |  |  | (31,914) |  |  |  |  |

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