Business Combinations (Details of Intangible Assets Acquired) (Details) (USD $) In Thousands, unless otherwise specified		0 Months Ended		0 Months Ended		0 Months Ended			0 Months Ended
Jun. 30, 2011 GlobalExpense	Jul. 03, 2011 GlobalExpense Software Technology Y	Jun. 30, 2011 GlobalExpense Software Technology	Jul. 03, 2011 GlobalExpense User base Y	Jun. 30, 2011 GlobalExpense User base	Jul. 03, 2011 GlobalExpense Trademark and trade name Y	Jun. 30, 2011 GlobalExpense Trademark and trade name	Jan. 24, 2011 Tripit	Jan. 24, 2011 Tripit Software Technology Y	Jan. 24, 2011 Tripit User base Y	Jan. 24, 2011 Tripit Trademark and trade name Y
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Asset, Amount	$ 10,350		$ 3,570		$ 6,600		$ 180	$ 19,604	$ 8,980	$ 8,524	$ 2,100
Acquired Finite-lived Intangible Asset, Weighted Average Useful Life		2		9		2			5	5	10

The calculated weighted-average amortization period of a major class of finite-lived intangible assets acquired during the current period either individually or as part of a group of assets (in either an asset acquisition or business combination). A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 44

-Subparagraph a(3)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16265-109275

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration