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STOCKHOLDERS' EQUITY (Tables) | 6 Months Ended
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Jun. 30, 2016
Stockholders' Equity Note [Abstract] |
Summary of Changes in Shareholders' Equity | A summary of changes in shareholders’ equity is presented below (in thousands):
|  | Six Months Ended June 30, 2016
|  | (In thousands)
|  | Number of Shares |  | Common Stock |  | Additional Paid-In Capital |  | Retained Earnings |  | Total
Balance at December 31, 2015 |  | 39,669 |  |  | $ | 397 |  |  | $ | 559,492 |  |  | $ | 699,048 |  |  | $ | 1,258,937 |
Net earnings |  | — |  |  | — |  |  | — |  |  | 60,847 |  |  | 60,847 |
Exercise/vesting of stock-based awards |  | 349 |  |  | 3 |  |  | 229 |  |  | — |  |  | 232 |
Excess income tax provision from stock-based awards |  | — |  |  | — |  |  | (526 | ) |  | — |  |  | (526 | )
Stock-based compensation expense |  | — |  |  | — |  |  | 7,313 |  |  | — |  |  | 7,313 |
Balance at June 30, 2016 |  | 40,018 |  |  | $ | 400 |  |  | $ | 566,508 |  |  | $ | 759,895 |  |  | $ | 1,326,803 |
|  | Six Months Ended June 30, 2015
|  | (In thousands)
|  | Number of Shares |  | Common Stock |  | Additional Paid-In Capital |  | Retained Earnings |  | Total
Balance at December 31, 2014 |  | 39,147 |  |  | $ | 391 |  |  | $ | 538,788 |  |  | $ | 570,310 |  |  | $ | 1,109,489 |
Net earnings |  | — |  |  | — |  |  | — |  |  | 45,533 |  |  | 45,533 |
Exercise/vesting of stock-based awards |  | 514 |  |  | 6 |  |  | 2,833 |  |  | — |  |  | 2,839 |
Excess income tax benefit from stock-based awards |  | — |  |  | — |  |  | 2,012 |  |  | — |  |  | 2,012 |
Stock-based compensation expense |  | — |  |  | — |  |  | 8,465 |  |  | — |  |  | 8,465 |
Balance at June 30, 2015 |  | 39,661 |  |  | $ | 397 |  |  | $ | 552,098 |  |  | $ | 615,843 |  |  | $ | 1,168,338 |

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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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