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Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2014
Stockholders' Equity Note [Abstract] |
Summary of changes in shareholders' equity | A summary of changes in shareholders’ equity is presented below (dollars in thousands):
| Nine Months Ended September 30, 2014
| Number of Shares |  | Common Stock |  | Additional Paid-In Capital |  | Retained Earnings |  | Total
Balance at December 31, 2013 | 36,244 |  |  | $ | 362 |  |  | $ | 412,961 |  |  | $ | 428,069 |  |  | $ | 841,392 |
Net earnings | — |  |  | — |  |  | — |  |  | 93,033 |  |  | 93,033 |
Exercise/vesting of equity awards | 351 |  |  | 4 |  |  | 730 |  |  | — |  |  | 734 |
Excess income tax benefit from stock-based awards | — |  |  | — |  |  | 2,197 |  |  | — |  |  | 2,197 |
Equity award compensation expense | — |  |  | — |  |  | 9,035 |  |  | — |  |  | 9,035 |
Issuance of stock (1) | 2,530 |  |  | 25 |  |  | 110,395 |  |  | — |  |  | 110,420 |
Other | — |  |  | — |  |  | (114 | ) |  | — |  |  | (114 | )
Balance at September 30, 2014 | 39,125 |  |  | $ | 391 |  |  | $ | 535,204 |  |  | $ | 521,102 |  |  | $ | 1,056,697 |
| Nine Months Ended September 30, 2013
| 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/vesting of equity awards | 618 |  |  | 6 |  |  | 11,219 |  |  | — |  |  | 11,225 |
Excess income tax benefit from stock-based awards | — |  |  | — |  |  | 1,733 |  |  | — |  |  | 1,733 |
Equity award compensation expense | — |  |  | — |  |  | 7,040 |  |  | — |  |  | 7,040 |
Non-controlling interest acquisition | — |  |  | — |  |  | (257 | ) |  | — |  |  | (257 | )
Balance at September 30, 2013 | 36,231 |  |  | $ | 362 |  |  | $ | 409,984 |  |  | $ | 381,980 |  |  | $ | 792,326 |
(1) In January 2014, we issued 2,530,000 shares of common stock in a secondary public offering, par value $0.01 per share, at a price of $45.75 per share.

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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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