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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-In Capital | Accumulated Other Comprehensive Loss | Retained Earnings
--- | --- | --- | --- | --- | ---
Balance (in shares) at Dec. 31, 2016 |  | 32,606,000 |  |  |
Balance at Dec. 31, 2016 | $ 1,654,213 | $ 326 | $ 1,471,127 | $ (13,039) | $ 195,799
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 122,695 |  |  |  | 122,695
Other comprehensive income | 4,019 |  |  | 4,019 |
Exercise of stock options (in shares) |  | 82,000 |  |  |
Exercise of stock options | 6,797 | $ 1 | 6,796 |  |
Restricted stock grants (in shares) |  | 187,000 |  |  |
Restricted stock grants | 0 | $ 2 | (2) |  |
Restricted stock grants surrendered (in shares) |  | (99,000) |  |  |
Restricted stock grants surrendered | (14,902) | $ (1) | (14,901) |  |
Stock compensation expense, net of forfeitures | 38,921 |  | 38,921 |  |
Stock issued for equity offering (in shares) |  | 3,317,000 |  |  |
Stock issued for equity offering | 833,911 | $ 33 | 833,878 |  |
Employee stock purchase plan (in shares) |  | 14,000 |  |  |
Employee stock purchase plan | 3,434 | $ 0 | 3,434 |  |
Balance (in shares) at Dec. 31, 2017 |  | 36,107,000 |  |  |
Balance at Dec. 31, 2017 | 2,651,250 | $ 361 | 2,339,253 | (9,020) | 320,656
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 238,334 |  |  |  | 238,334
Other comprehensive income | (2,668) |  |  | (2,668) |
Exercise of stock options (in shares) |  | 177,000 |  |  |
Exercise of stock options | 21,993 | $ 2 | 21,991 |  |
Restricted stock grants (in shares) |  | 160,000 |  |  |
Restricted stock grants | 0 | $ 1 | (1) |  |
Restricted stock grants surrendered (in shares) |  | (116,000) |  |  |
Restricted stock grants surrendered | (24,327) | $ (1) | (24,326) |  |
Stock compensation expense, net of forfeitures | 40,889 |  | 40,889 |  |
Employee stock purchase plan (in shares) |  | 15,000 |  |  |
Employee stock purchase plan | 5,641 | $ 0 | 5,641 |  |
Stock issued for acquisitions (in shares) |  | 103,000 |  |  |
Stock issued for acquisitions | 36,366 | $ 1 | 36,365 |  |
Balance (in shares) at Dec. 31, 2018 |  | 36,446,000 |  |  |
Balance at Dec. 31, 2018 | 3,021,942 | $ 364 | 2,419,812 | (11,688) | 613,454
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 314,963 |  |  |  | 314,963
Other comprehensive income | 3,103 |  |  | 3,103 |
Exercise of stock options (in shares) |  | 116,000 |  |  |
Exercise of stock options | 18,652 | $ 1 | 18,651 |  |
Restricted stock grants (in shares) |  | 168,000 |  |  |
Restricted stock grants | 0 | $ 2 | (2) |  |
Restricted stock grants surrendered (in shares) |  | (76,000) |  |  |
Restricted stock grants surrendered | (27,577) | $ (1) | (27,576) |  |
Stock compensation expense, net of forfeitures | 51,818 |  | 51,818 |  |
Management stock purchase plan | 3,491 |  | 3,491 |  |
Employee stock purchase plan (in shares) |  | 14,000 |  |  |
Employee stock purchase plan | 7,144 | $ 0 | 7,144 |  |
Balance (in shares) at Dec. 31, 2019 |  | 36,668,000 |  |  |
Balance at Dec. 31, 2019 | $ 3,405,593 | $ 366 | $ 2,473,338 | $ (8,585) | $ 940,474

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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://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=27010918&loc=d3e74512-122707 Reference 2: 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=6877327&loc=d3e13212-122682 Reference 3: 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=6877327&loc=d3e13212-122682 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(30)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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Period Type: | instant