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Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2013
Stockholders' Equity Note [Abstract] |
Summary of changes in shareholders' equity |
| Six Months Ended June 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 | — |  |  | — |  |  | — |  |  | 40,184 |  |  | 40,184 |
Exercise of stock options | 322 |  |  | 3 |  |  | 10,913 |  |  | — |  |  | 10,916 |
Excess income tax benefit from stock-based awards | — |  |  | — |  |  | 1,687 |  |  | — |  |  | 1,687 |
Equity award compensation expense | — |  |  | — |  |  | 3,941 |  |  | — |  |  | 3,941 |
Issuance of restricted stock | 281 |  |  | 3 |  |  | (3 | ) |  | — |  |  | — |
Non-controlling interest acquisition | — |  |  | — |  |  | (257 | ) |  | — |  |  | (257 | )
Balance at June 30, 2013 | 36,216 |  |  | $ | 362 |  |  | $ | 406,530 |  |  | $ | 343,789 |  |  | $ | 750,681 |
| Six Months Ended June 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 | — |  |  | — |  |  | — |  |  | 3,251 |  |  | — |  |  | 3,251 |
Exercise of stock options | 79 |  |  | 1 |  |  | 1,221 |  |  | — |  |  | — |  |  | 1,222 |
Equity award compensation expense | — |  |  | — |  |  | 3,273 |  |  | — |  |  | — |  |  | 3,273 |
Issuance of restricted stock | 197 |  |  | 2 |  |  | (2 | ) |  | — |  |  | — |  |  | — |
Balance at June 30, 2012 | 40,653 |  |  | $ | 407 |  |  | $ | 483,331 |  |  | $ | 201,693 |  |  | $ | (188,773 | ) |  | $ | 496,658 |

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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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