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Operating Segment and Enterprise Wide Reporting (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Schedule of Net revenues by geographic destination and as a percentage of total revenues |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 75,066 | $ 68,511 | $ 79,093 | $ 70,260 | $ 74,650 | $ 69,774 | $ 73,450 | $ 65,742 | $ 292,930 | $ 283,616 | $ 250,726
Revenues by Geographical Area Percentage |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
United States [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule of Net revenues by geographic destination and as a percentage of total revenues |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 211,110 | 198,456 | 180,065
Revenues by Geographical Area Percentage |  |  |  |  |  |  |  |  | 72.00% | 70.00% | 72.00%
Europe (excluding United Kingdom) [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule of Net revenues by geographic destination and as a percentage of total revenues |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 33,146 | 37,205 | 31,188
Revenues by Geographical Area Percentage |  |  |  |  |  |  |  |  | 11.00% | 13.00% | 12.00%
United Kingdom [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule of Net revenues by geographic destination and as a percentage of total revenues |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 16,555 | 17,870 | 15,285
Revenues by Geographical Area Percentage |  |  |  |  |  |  |  |  | 6.00% | 6.00% | 6.00%
Canada [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule of Net revenues by geographic destination and as a percentage of total revenues |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 16,742 | 16,056 | 13,724
Revenues by Geographical Area Percentage |  |  |  |  |  |  |  |  | 6.00% | 6.00% | 6.00%
Other [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule of Net revenues by geographic destination and as a percentage of total revenues |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 15,377 | $ 14,029 | $ 10,464
Revenues by Geographical Area Percentage |  |  |  |  |  |  |  |  | 5.00% | 5.00% | 4.00%

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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