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CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock [Member] | Additional Paid-In Capital [Member] | Treasury Stock [Member] | Retained Earnings [Member]
--- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2017 | $ 66,321 | $ 555 | $ 25,337 | $ (256,363) | $ 296,792
Balance (shares) at Dec. 31, 2017 |  | 55,489 |  |  |
Purchase of treasury stock, at cost | (16,236) | $ 0 | 0 | (16,236) | 0
Issuance of long-term incentive awards and dividend equivalents | 0 | 0 | (5,764) | 6,619 | (855)
Stock-based compensation expense | 14,656 | 0 | 11,293 | 3,363 | 0
Other | 1,611 | 0 | 1,181 | 430 | 0
Dividends paid | (25,170) | 0 | 0 | 0 | (25,170)
Unrealized gain (loss) on marketable securities, net of tax | (20) | 0 | 0 | 0 | (20)
Net income | 110,758 | 0 | 0 | 0 | 110,758
Balance at Sep. 30, 2018 | 151,920 | $ 555 | 32,047 | (262,187) | 381,505
Balance (shares) at Sep. 30, 2018 |  | 55,489 |  |  |
Balance at Jun. 30, 2018 | 117,860 | $ 555 | 27,363 | (263,764) | 353,706
Balance (shares) at Jun. 30, 2018 |  | 55,489 |  |  |
Purchase of treasury stock, at cost | (9) | $ 0 | 0 | (9) | 0
Stock-based compensation expense | 5,769 | 0 | 4,288 | 1,481 | 0
Other | 501 | 0 | 396 | 105 | 0
Dividends paid | (8,384) | 0 | 0 | 0 | (8,384)
Unrealized gain (loss) on marketable securities, net of tax | (24) | 0 | 0 | 0 | (24)
Net income | 36,207 | 0 | 0 | 0 | 36,207
Balance at Sep. 30, 2018 | 151,920 | $ 555 | 32,047 | (262,187) | 381,505
Balance (shares) at Sep. 30, 2018 |  | 55,489 |  |  |
Balance at Dec. 31, 2018 | 77,676 | $ 555 | 36,752 | (357,569) | 397,938
Balance (shares) at Dec. 31, 2018 |  | 55,489 |  |  |
Purchase of treasury stock, at cost | (153,668) | $ 0 | 0 | (153,668) | 0
Issuance of long-term incentive awards and dividend equivalents | 0 | 0 | (7,695) | 8,646 | (951)
Stock-based compensation expense | 20,813 | 0 | 15,656 | 5,157 | 0
Other | 2,205 | 0 | 1,688 | 517 | 0
Dividends paid | (36,777) | 0 | 0 | 0 | (36,777)
Unrealized gain (loss) on marketable securities, net of tax | 35 | 0 | 0 | 0 | 35
Net income | 130,704 | 0 | 0 | 0 | 130,704
Balance at Sep. 30, 2019 | 40,988 | $ 555 | 46,401 | (496,917) | 490,949
Balance (shares) at Sep. 30, 2019 |  | 55,489 |  |  |
Balance at Jun. 30, 2019 | 134,889 | $ 555 | 41,009 | (383,830) | 477,155
Balance (shares) at Jun. 30, 2019 |  | 55,489 |  |  |
Purchase of treasury stock, at cost | (114,872) | $ 0 | 0 | (114,872) | 0
Stock-based compensation expense | 6,517 | 0 | 4,880 | 1,637 | 0
Other | 660 | 0 | 512 | 148 | 0
Dividends paid | (12,037) | 0 | 0 | 0 | (12,037)
Unrealized gain (loss) on marketable securities, net of tax | (28) | 0 | 0 | 0 | (28)
Net income | 25,859 | 0 | 0 | 0 | 25,859
Balance at Sep. 30, 2019 | $ 40,988 | $ 555 | $ 46,401 | $ (496,917) | $ 490,949
Balance (shares) at Sep. 30, 2019 |  | 55,489 |  |  |

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- Definition Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 + Details
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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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