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Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2013
Stockholders' Equity Note [Abstract] |
Summary of changes in shareholders' equity |
| Nine Months Ended September 30, 2013
| (In thousands)
| Number of Shares |  | Common Stock |  | Additional Paid-In Capital |  | Retained Earnings |  | Total
Balance at December 31, 2012 | 35,613 |  |  | $ | 356 |  |  | $ | 390,249 |  |  | $ | 303,605 |  |  | $ | 694,210 |
Net earnings | — |  |  | — |  |  | — |  |  | 78,375 |  |  | 78,375 |
Exercise of stock options | 335 |  |  | 3 |  |  | 11,222 |  |  | — |  |  | 11,225 |
Excess income tax benefit from stock-based awards | — |  |  | — |  |  | 1,733 |  |  | — |  |  | 1,733 |
Equity award compensation expense | — |  |  | — |  |  | 7,040 |  |  | — |  |  | 7,040 |
Issuance of restricted stock | 283 |  |  | 3 |  |  | (3 | ) |  | — |  |  | — |
Non-controlling interest acquisition | — |  |  | — |  |  | (257 | ) |  | — |  |  | (257 | )
Balance at September 30, 2013 | 36,231 |  |  | $ | 362 |  |  | $ | 409,984 |  |  | $ | 381,980 |  |  | $ | 792,326 |
| Nine Months Ended September 30, 2012
| (In thousands)
| Number of Shares |  | Common Stock |  | Additional Paid-In Capital |  | Retained Earnings |  | Treasury Stock |  | Total
Balance at December 31, 2011 | 40,377 |  |  | $ | 404 |  |  | $ | 478,839 |  |  | $ | 198,442 |  |  | $ | (188,773 | ) |  | $ | 488,912 |
Net earnings | — |  |  | — |  |  | — |  |  | 10,035 |  |  | — |  |  | 10,035 |
Exercise of stock options | 259 |  |  | 3 |  |  | 3,897 |  |  | — |  |  | — |  |  | 3,900 |
Equity award compensation expense | — |  |  | — |  |  | 6,095 |  |  | — |  |  | — |  |  | 6,095 |
Issuance of restricted stock | 200 |  |  | 2 |  |  | (2 | ) |  | — |  |  | — |  |  | — |
Issuance of stock (1) | 2,645 |  |  | 26 |  |  | 87,099 |  |  | — |  |  | — |  |  | 87,125 |
Cancellation of treasury shares (2) | (7,891 | ) |  | (79 | ) |  | (188,694 | ) |  | — |  |  | 188,773 |  |  | — |
Balance at September 30, 2012 | 35,590 |  |  | 356 |  |  | 387,234 |  |  | 208,477 |  |  | — |  |  | 596,067 |
(1) In July 2012, we issued a public offering of 2,645,000 shares of common stock, par value $0.01 per share, at a price to the public of $34.75 per share. (2) During the third quarter of 2012, we canceled and retired all of our treasury shares. These shares remain as authorized and unissued shares.

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- Definition Tabular disclosure of changes in the separate accounts comprising stockholders' equity (in addition to retained earnings) and of the changes in the number of shares of equity securities during at least the most recent annual fiscal period and any subsequent interim period presented is required to make the financial statements sufficiently informative if both financial position and results of operations are presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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