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EARNINGS PER SHARE (Tables) | 9 Months Ended
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Sep. 30, 2015
Schedule of Calculation of Numerator and Denominator in Earnings Per Share | A reconciliation of the numerator and denominator of the basic earnings per share computation to the numerator and denominator of the diluted earnings per share computation is as follows (in thousands, except per share data):
|  | For the Three Months Ended September 30, |  |  | For the Nine Months Ended September 30, |
|  | 2015 |  |  | 2014 |  |  | 2015 |  |  | 2014 |
NUMERATOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 50,676 |  |  | $ | 57,546 |  |  | $ | 173,256 |  |  | $ | 165,016 |
Diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 50,676 |  |  | $ | 57,546 |  |  | $ | 173,256 |  |  | $ | 165,016 |
DENOMINATOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding |  |  | 117,066 |  |  |  | 116,185 |  |  |  | 116,889 |  |  |  | 116,025 |
Diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding |  |  | 117,066 |  |  |  | 116,185 |  |  |  | 116,889 |  |  |  | 116,025 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options |  |  | 559 |  |  |  | 886 |  |  |  | 716 |  |  |  | 895 |
Restricted stock-based compensation |  |  | 149 |  |  |  | 318 |  |  |  | 181 |  |  |  | 263 |
Weighted average shares and assumed conversions |  |  | 117,774 |  |  |  | 117,389 |  |  |  | 117,786 |  |  |  | 117,183 |
BASIC EARNINGS PER SHARE |  | $ | 0.43 |  |  | $ | 0.50 |  |  | $ | 1.48 |  |  | $ | 1.42 |
DILUTED EARNINGS PER SHARE |  | $ | 0.43 |  |  | $ | 0.49 |  |  | $ | 1.47 |  |  | $ | 1.41 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
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Period Type: | duration