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Income Taxes (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013
Income Tax Disclosure [Abstract] |  |  |
Income tax provision | $ 25,518,000 | $ 19,042,000 |
Effective income tax rates | 38.10% | 38.50% |
Actual income tax rates | 38.20% | 38.70% |
Unrecognized income tax benefits | 2,400,000 |  | 3,100,000
Unrecognized income tax benefits, if recognized, that would favorably affect the effective income tax rate | 900,000 |  | 1,700,000
Accrued interest expense related to unrecognized income tax benefits | 200,000 |  | 200,000
Interest expense related to unrecognized income tax benefits recognized | 100,000 | 200,000 |
Unrecognized income tax benefits to be recognized in the next twelve months | $ 100,000 |  |

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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