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Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Total | Follow-On Offering | Private Placement | Cumulative effect of accounting changes | Common Stock | Common Stock Follow-On Offering | Common Stock Private Placement | Additional paid-in capital | Additional paid-in capital Follow-On Offering | Additional paid-in capital Private Placement | Accumulated other comprehensive loss | Accumulated deficit | Accumulated deficit Private Placement | Accumulated deficit Cumulative effect of accounting changes
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Beginning balance (in shares) at Dec. 31, 2018 |  |  |  |  | 250,283,513 |  |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2018 | $ 147,431 |  |  | $ 107,822 | $ 2,502 |  |  | $ 392,896 |  |  | $ (29,414) | $ (218,553) |  | $ 107,822
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 103,096 |  |  |  |  |  |  |  |  |  |  | 103,096 |  |
Other comprehensive income (loss) | 5,487 |  |  |  |  |  |  |  |  |  | 5,487 |  |  |
Class B Common Stock follow-on offering, net of expenses (in shares) |  |  |  |  |  |  | 64,509 |  |  |  |  |  |  |
Class B Common Stock follow-on offering, net of expenses of $12,898 |  |  | $ 418 |  |  |  |  |  |  | $ 466 |  |  | $ (48) |
Dividends declared | (25,390) |  |  |  |  |  |  |  |  |  |  | (25,390) |  |
Profit-sharing plan shares, net (in shares) |  |  |  |  | (318,203) |  |  |  |  |  |  |  |  |
Profit-sharing plan shares, net | (2,417) |  |  |  | $ (3) |  |  |  |  |  |  | (2,414) |  |
Shares issued in connection with deferred compensation plan, net (in shares) |  |  |  |  | 2,322,983 |  |  |  |  |  |  |  |  |
Shares issued in connection with deferred compensation plan, net | (5,609) |  |  |  | $ 23 |  |  |  |  |  |  | (5,632) |  |
Deferred compensation plan elective participant deferrals and vesting of awards | 3,586 |  |  |  |  |  |  | 3,586 |  |  |  |  |  |
Payment of shareholder Put and Call rights (in shares) |  |  |  |  | (1,126,747) |  |  |  |  |  |  |  |  |
Payment of shareholder Put and Call rights | (8,838) |  |  |  | $ (11) |  |  |  |  |  |  | (8,827) |  |
Stock option exercises, net (in shares) |  |  |  |  | 3,214,542 |  |  |  |  |  |  |  |  |
Stock option exercises, net | 1,303 |  |  |  | $ 33 |  |  | 3,579 |  |  |  | (2,309) |  |
Stock-based compensation expense | 8,091 |  |  |  |  |  |  | 8,091 |  |  |  |  |  |
Shares related to restricted stock, net (in shares) |  |  |  |  | 395,336 |  |  |  |  |  |  |  |  |
Shares related to restricted stock, net | (399) |  |  |  | $ 4 |  |  | (4) |  |  |  | (399) |  |
Other (in shares) |  |  |  |  | 7,016 |  |  |  |  |  |  |  |  |
Other | 38 |  |  |  |  |  |  | 53 |  |  |  | (15) |  |
Ending balance (in shares) at Dec. 31, 2019 |  |  |  |  | 254,842,949 |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2019 | 334,619 |  |  |  | $ 2,548 |  |  | 408,667 |  |  | (23,927) | (52,669) |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 126,521 |  |  |  |  |  |  |  |  |  |  | 126,521 |  |
Other comprehensive income (loss) | (2,306) |  |  |  |  |  |  |  |  |  | (2,306) |  |  |
Class B Common Stock follow-on offering, net of expenses (in shares) |  |  |  |  |  | 9,603,965 |  |  |  |  |  |  |  |
Class B Common Stock follow-on offering, net of expenses of $12,898 |  | $ 294,429 | $ (57) |  |  | $ 96 |  |  | $ 294,333 |  |  |  | $ (57) |
Dividends declared | (424,018) |  |  |  |  |  |  |  |  |  |  | (424,018) |  |
Profit-sharing plan shares, net (in shares) |  |  |  |  | (549,834) |  |  |  |  |  |  |  |  |
Profit-sharing plan shares, net | (6,970) |  |  |  | $ (5) |  |  |  |  |  |  | (6,965) |  |
Shares issued in connection with deferred compensation plan, net (in shares) |  |  |  |  | 3,081,607 |  |  |  |  |  |  |  |  |
Shares issued in connection with deferred compensation plan, net | (4,625) |  |  |  | $ 31 |  |  |  |  |  |  | (4,656) |  |
Deferred compensation plan elective participant deferrals and vesting of awards | 3,530 |  |  |  |  |  |  | 3,530 |  |  |  |  |  |
Payment of shareholder Put and Call rights (in shares) |  |  |  |  | (128,007) |  |  |  |  |  |  |  |  |
Payment of shareholder Put and Call rights | (1,454) |  |  |  | $ (1) |  |  |  |  |  |  | (1,453) |  |
Stock option exercises, net (in shares) |  |  |  |  | 4,060,839 |  |  |  |  |  |  |  |  |
Stock option exercises, net | 4,356 |  |  |  | $ 41 |  |  | 9,070 |  |  |  | (4,755) |  |
Shares issued for stock grants, net (in shares) |  |  |  |  | 21,956 |  |  |  |  |  |  |  |  |
Shares issued for stock grants, net | 319 |  |  |  |  |  |  | 319 |  |  |  |  |  |
Stock-based compensation expense | 25,194 |  |  |  |  |  |  | 25,194 |  |  |  |  |  |
Shares related to restricted stock, net (in shares) |  |  |  |  | 1,221,029 |  |  |  |  |  |  |  |  |
Shares related to restricted stock, net | (7,939) |  |  |  | $ 12 |  |  | 0 |  |  |  | (7,951) |  |
Ending balance (in shares) at Dec. 31, 2020 |  |  |  |  | 272,154,504 |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2020 | 341,599 |  |  |  | $ 2,722 |  |  | 741,113 |  |  | (26,233) | (376,003) |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 93,192 |  |  |  |  |  |  |  |  |  |  | 93,192 |  |
Other comprehensive income (loss) | (65,541) |  |  |  |  |  |  |  |  |  | (65,541) |  |  |
Shares issued related to acquisition (in shares) |  |  |  |  | 3,141,342 |  |  |  |  |  |  |  |  |
Shares issued related to acquisition | 182,390 |  |  |  | $ 31 |  |  | 182,359 |  |  |  |  |  |
Purchase of capped call options, net of tax of $12,871 | (38,734) |  |  |  |  |  |  | (38,734) |  |  |  |  |  |
Dividends declared | (33,537) |  |  |  |  |  |  |  |  |  |  | (33,537) |  |
Shares issued in connection with deferred compensation plan, net (in shares) |  |  |  |  | 2,378,645 |  |  |  |  |  |  |  |  |
Shares issued in connection with deferred compensation plan, net | (69,007) |  |  |  | $ 24 |  |  |  |  |  |  | (69,031) |  |
Deferred compensation plan elective participant deferrals and vesting of awards | 2,619 |  |  |  |  |  |  | 2,619 |  |  |  |  |  |
Deferred compensation plan modification | (4,739) |  |  |  |  |  |  | (4,739) |  |  |  |  |  |
Shares issued in connection with Executive Bonus Plan, net (in shares) |  |  |  |  | 238,755 |  |  |  |  |  |  |  |  |
Shares issued in connection with Executive Bonus Plan, net | 12,214 |  |  |  | $ 2 |  |  | 20,951 |  |  |  | (8,739) |  |
Shares issued in connection with employee stock purchase plan (in shares) |  |  |  |  | 104,716 |  |  |  |  |  |  |  |  |
Shares issued in connection with employee stock purchase plan, net | 3,408 |  |  |  | $ 1 |  |  | 3,845 |  |  |  | (438) |  |
Stock option exercises, net (in shares) |  |  |  |  | 4,587,053 |  |  |  |  |  |  |  |  |
Stock option exercises, net | (32,180) |  |  |  | $ 46 |  |  | 5,559 |  |  |  | (37,785) |  |
Shares issued for stock grants, net (in shares) |  |  |  |  | 7,824 |  |  |  |  |  |  |  |  |
Shares issued for stock grants, net | 450 |  |  |  |  |  |  | 450 |  |  |  |  |  |
Stock-based compensation expense | 24,382 |  |  |  |  |  |  | 24,382 |  |  |  |  |  |
Shares related to restricted stock, net (in shares) |  |  |  |  | (86,120) |  |  |  |  |  |  |  |  |
Shares related to restricted stock, net | (7,294) |  |  |  | $ (1) |  |  | 0 |  |  |  | (7,293) |  |
Ending balance (in shares) at Dec. 31, 2021 |  |  |  |  | 282,526,719 |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2021 | $ 409,222 |  |  |  | $ 2,825 |  |  | $ 937,805 |  |  | $ (91,774) | $ (439,634) |  |

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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(g)(1)(ii)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=122038336&loc=d3e74512-122707 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=123596393&loc=d3e14064-108612 Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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