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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Common stock | Paid-in capital | Treasury stock | Accumulated other comprehensive (loss) income | Retained earnings
--- | --- | --- | --- | --- | --- | ---
Balance, beginning of period at Dec. 31, 2016 |  | $ 359,400 | $ 1,782,337 | $ (150,359) | $ (75,100) | $ 632,717
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net common stock issued under share-based compensation plans |  | 776 | (7,558) |  |  |
Issuance of common stock |  | 10,386 | 60,903 |  |  |
Equity compensation |  |  | 10,578 |  |  |
Repurchase of common stock |  |  |  | 0 |  |
Reissuance of treasury stock, net |  |  |  | 150,359 |  | (21,740)
Other comprehensive (loss) income, net of tax | $ 49,003 |  |  |  | 49,003 |
Net income | 328,447 |  |  |  |  | 328,447
Balance, end of period at Sep. 30, 2017 | 3,130,149 | 370,562 | 1,846,260 | 0 | (26,097) | 939,424
Balance, beginning of period at Dec. 31, 2017 | 3,154,526 | 370,567 | 1,850,582 | 0 | (43,801) | 977,178
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net common stock issued under share-based compensation plans |  | 786 | (8,917) |  |  |
Issuance of common stock |  | 0 | 0 |  |  |
Equity compensation |  |  | 15,974 |  |  |
Repurchase of common stock |  |  |  | (100,059) |  |
Reissuance of treasury stock, net |  |  |  | 0 |  | 0
Other comprehensive (loss) income, net of tax | (85,130) |  |  |  | (85,130) |
Net income | 512,351 |  |  |  |  | 512,351
Balance, end of period at Sep. 30, 2018 | $ 3,489,531 | $ 371,353 | $ 1,857,639 | $ (100,059) | $ (128,931) | $ 1,489,529

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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/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 3: http://www.xbrl.org/2003/role/presentationRef -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 4: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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