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Segment Information (Details 1) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011
Revenues, classified by the major geographic areas |  |  |  |
Total revenue | $ 233,145 | $ 244,518 | $ 471,359 | $ 497,935
United States [Member] |  |  |  |
Revenues, classified by the major geographic areas |  |  |  |
Total revenue | 222,478 | 232,272 | 448,113 | 471,562
Europe / Middle East [Member] |  |  |  |
Revenues, classified by the major geographic areas |  |  |  |
Total revenue | 7,258 | 6,554 | 4,265 | 14,787
Asia [Member] |  |  |  |
Revenues, classified by the major geographic areas |  |  |  |
Total revenue | 1,620 | 3,246 | 15,534 | 6,385
South America [Member] |  |  |  |
Revenues, classified by the major geographic areas |  |  |  |
Total revenue | $ 1,789 | $ 2,446 | $ 3,447 | $ 5,201

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- Definition Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains. + 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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