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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

Revenues by geographical area percentage.

+ References

No definition available.

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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

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