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Earnings Per Share | 12 Months Ended
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Dec. 31, 2013
Earnings Per Share [Abstract] |
Earnings Per Share | 7. Earnings Per Share Basic earnings per share is calculated by dividing net income by the weighted average number of common shares outstanding during the period. Except where the result would be anti-dilutive, dilutive earnings per share is calculated by assuming the vesting of unvested restricted stock and the exercise of stock options, as well as their related income tax benefits. The following table reconciles the numerator and the denominator used to calculate basic and diluted earnings per share:
|  | Year ended December 31, |
|  | 2013 |  |  | 2012 |  |  | 2011 |
Numerator- net income |  | $ | 174,539 |  |  | $ | 93,223 |  |  | $ | 324,643 |
Denominator- weighted average shares |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 68,081,632 |  |  |  | 67,360,632 |  |  |  | 67,130,356 |
Dilutive effect of stock compensation awards (1) |  |  | 1,585,897 |  |  |  | 1,832,506 |  |  |  | 667,015 |
Diluted |  |  | 69,667,529 |  |  |  | 69,193,138 |  |  |  | 67,797,371 |
Net income per share |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 2.56 |  |  | $ | 1.38 |  |  | $ | 4.84 |
Diluted |  | $ | 2.51 |  |  | $ | 1.35 |  |  | $ | 4.79 |
(1) Excludes approximately 10,300 and 363,000 stock options and restricted stock awards for the twelve month periods ended December 31, 2013 and December 31, 2012, respectively, as the impact of such awards was anti-dilutive. There were no anti-dilutive awards for the twelve month period ended December 31, 2011.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=16381557&loc=d3e4984-109258 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1278-109256 + Details
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