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Commitments and Contingencies (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 Lease	Dec. 31, 2011	Dec. 31, 2010
Commitments and Contingencies (Textual)
Number of long-term, non-cancelable operating leases	98
Rent expense	$ 46.5	$ 42.2	$ 32.6

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- Definition

Number of long-term, non-cancelable operating leases.

+ References

No definition available.

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- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717

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