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Consolidated Statements of Stockholders' Equity (USD $) In Thousands | Total | Common stock [Member] | Additional paid-in capital [Member] | Retained earnings [Member] | Accumulated other comprehensive income [Member] | Treasury stock [Member]
--- | --- | --- | --- | --- | --- | ---
Beginning of year at Dec. 31, 2012 |  | $ 196,388 | $ 270,654 | $ 1,125,154 | $ 54,040 | $ (555,644)
Dividend reinvestment plan (shares: 44,322 – 2014; 49,964 - 2013) |  | 100 | 1,052 |  |  |
Stock purchase and compensation plans (shares: 588,858 - 2014; 712,994 - 2013) |  | 1,426 | 12,361 |  |  |
Net income | 81,083 |  |  | 81,083 |  |
Dividends to stockholders ($0.39 per share - 2014 and 2013) |  |  |  | (22,153) |  |
Other comprehensive income (loss) | (36,957) |  |  |  | (36,957) |
Acquisition of treasury stock (shares: 130,573 - 2014; 151,555 - 2013) |  |  |  |  |  | (3,295)
End of period at Sep. 30, 2013 | 1,124,209 | 197,914 | 284,067 | 1,184,084 | 17,083 | (558,939)
Beginning of year at Dec. 31, 2013 | 1,153,928 | 198,240 | 288,182 | 1,202,015 | 24,851 | (559,360)
Dividend reinvestment plan (shares: 44,322 – 2014; 49,964 - 2013) |  | 89 | 957 |  |  |
Stock purchase and compensation plans (shares: 588,858 - 2014; 712,994 - 2013) |  | 1,178 | 11,286 |  |  |
Net income | 100,477 |  |  | 100,477 |  |
Dividends to stockholders ($0.39 per share - 2014 and 2013) |  |  |  | (22,344) |  |
Other comprehensive income (loss) | 24,274 |  |  |  | 24,274 |
Acquisition of treasury stock (shares: 130,573 - 2014; 151,555 - 2013) |  |  |  |  |  | (2,920)
End of period at Sep. 30, 2014 | $ 1,266,925 | $ 199,507 | $ 300,425 | $ 1,280,148 | $ 49,125 | $ (562,280)

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- Definition Amount of paid and unpaid common stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 + 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://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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section E 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 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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