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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Operating Loss Carryforwards [Line Items] |  |  |
Income tax provision | $ 18,969 | $ 20,225 |
Effective income tax rates | 37.80% | 37.80% |
Actual income tax rates | 35.50% | 37.90% |
Excess tax benefit from share-based compensation, tax provision | $ 1,200 |  |
Unrecognized income tax benefits | 4,800 |  | $ 4,800
Unrecognized income tax benefits, if recognized, that would favorably affect the effective income tax rate | 3,000 |  | 3,000
Accrued interest expense related to unrecognized income tax benefits | 500 |  | $ 400
Interest expense related to unrecognized income tax benefits | 100 | $ 100 |
Unrecognized income tax benefits to be recognized in the next twelve months | $ 4,100 |  |

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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 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 Reference 2: 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 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 + Details
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