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Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Accumulated Other Comprehensive Income (Loss), net of Taxes | Retained Earnings | Treasury Stock
--- | --- | --- | --- | --- | --- | ---
Balance (in shares) at Dec. 31, 2015 |  | 73,793 |  |  |  |
Balance at Dec. 31, 2015 | $ 296,456 | $ 738 | $ 199,294 | $ 543 | $ 106,886 | $ (11,005)
Comprehensive income: |  |  |  |  |  |
Net income for the period | 77,396 |  |  |  | 77,396 |
Unrealized (loss) gain on available-for-sale marketable securities, net of taxes | (862) |  |  | (862) |  |
Total comprehensive income | 76,534 |  |  |  |  |
Exercise of stock options and other stock-based compensation, net of shares tendered for payment (in shares) |  | 301 |  |  |  |
Exercise of stock options and other stock-based compensation, net of shares tendered for payment | 5,968 | $ 3 | 5,965 |  |  |
Tax benefit from equity compensation plans | 2,773 |  | 2,773 |  |  |
Share-based compensation expense — stock options, restricted stock and restricted stock units | 3,743 |  | 3,743 |  |  |
Treasury shares issued for Deferred Compensation Plan funding and redemptions | 534 |  | 103 |  |  | 431
Shares issued pursuant to Employee Stock Plans | 2,067 |  | 1,696 |  |  | 371
Dividends paid and accrued | (53,342) |  |  |  | (53,342) |
Shares issued pursuant to Dividend Reinvestment Plan | 109 |  | 91 |  |  | 18
Shares issued pursuant to previous settlement (in shares) |  | 113 |  |  |  |
Shares issued pursuant to previous settlement | 4,000 | $ 1 | 3,999 |  |  |
Other (in shares) |  | (3) |  |  |  |
Other | 0 |  |  |  |  |
Balance (in shares) at Dec. 31, 2016 |  | 74,204 |  |  |  |
Balance at Dec. 31, 2016 | 338,842 | $ 742 | 217,664 | (319) | 130,940 | (10,185)
Comprehensive income: |  |  |  |  |  |
Net income for the period | 88,226 |  |  |  | 88,226 |
Unrealized (loss) gain on available-for-sale marketable securities, net of taxes | 1,156 |  |  | 1,156 |  |
Total comprehensive income | 89,382 |  |  |  |  |
Exercise of stock options and other stock-based compensation, net of shares tendered for payment (in shares) |  | 697 |  |  |  |
Exercise of stock options and other stock-based compensation, net of shares tendered for payment | 12,808 | $ 7 | 12,801 |  |  |
Share-based compensation expense — stock options, restricted stock and restricted stock units | 4,945 |  | 4,945 |  |  |
Treasury shares issued for Deferred Compensation Plan funding and redemptions | 156 |  | 181 |  |  | (25)
Shares issued pursuant to Employee Stock Plans | 2,091 |  | 1,752 |  |  | 339
Dividends paid and accrued | (55,306) |  |  |  | (55,306) |
Shares issued pursuant to Dividend Reinvestment Plan | 95 |  | 82 |  |  | 13
Shares issued pursuant to acquisition (in shares) |  | 59 |  |  |  |
Shares issued pursuant to acquisition | 6,939 | $ 1 | 6,938 |  |  |
Balance (in shares) at Dec. 31, 2017 |  | 74,960 |  |  |  |
Balance at Dec. 31, 2017 | 399,952 | $ 750 | 244,363 | 837 | 163,860 | (9,858)
Comprehensive income: |  |  |  |  |  |
Net income for the period | 83,524 |  |  |  | 83,524 |
Unrealized (loss) gain on available-for-sale marketable securities, net of taxes | (679) |  |  | (679) |  |
Total comprehensive income | 82,845 |  |  |  |  |
Exercise of stock options and other stock-based compensation, net of shares tendered for payment (in shares) |  | 380 |  |  |  |
Exercise of stock options and other stock-based compensation, net of shares tendered for payment | 8,517 | $ 3 | 8,514 |  |  |
Share-based compensation expense — stock options, restricted stock and restricted stock units | 5,580 |  | 5,580 |  |  |
Treasury shares issued for Deferred Compensation Plan funding and redemptions | 354 |  | 519 |  |  | (165)
Shares issued pursuant to Employee Stock Plans | 2,821 |  | 2,475 |  |  | 346
Dividends paid and accrued | (57,361) |  |  |  | (57,361) |
Shares issued pursuant to Dividend Reinvestment Plan | 89 |  | 75 |  |  | 14
Contingent shares settled pursuant to acquisition | (2,291) |  | (2,291) |  |  |
Other (in shares) |  | 4 |  |  |  |
Other | 274 |  | 205 |  | 69 |
Balance (in shares) at Dec. 31, 2018 |  | 75,344 |  |  |  |
Balance at Dec. 31, 2018 | $ 440,780 | $ 753 | $ 259,440 | $ 158 | $ 190,092 | $ (9,663)

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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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- Definition This element represents movements included in the statement of changes in stockholders' equity which are not separately disclosed or provided for elsewhere in the taxonomy. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Number of increase (decrease) in shares of stock classified as other. + References No definition available. + Details
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