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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Income Tax Disclosure [Abstract] |  |  |  |  |
Provision for income taxes | $ 5,805 | $ 6,395 | $ 11,244 | $ 11,867 |
Payment of withholding taxes to foreign tax authorities | 4,800 | $ 4,800 | 9,600 | $ 9,800 |
Deferred Tax Assets, Gross | 186,500 |  | 186,500 |  |
Unrecognized tax benefits | 20,600 |  | 20,600 |  | $ 19,900
Unrecognized tax benefits, reduction of long-term deferred tax assets | 18,400 |  | 18,400 |  | 17,800
Unrecognized tax benefits included in long-term income taxes payable | 2,200 |  | 2,200 |  | $ 2,100
Portion of unrecognized tax benefits, which if recognized, would be recorded as an income tax benefit | $ 2,200 |  | $ 2,200 |  |

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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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 + Details
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