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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

X

- 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

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