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Goodwill and Other Intangible Assets (Details) (USD $) In Thousands | 6 Months Ended |  |  | 6 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2011 | Jun. 30, 2011 US Operating Segment [Member] | Dec. 31, 2010 US Operating Segment [Member] | Jun. 30, 2011 International Operating Segment [Member]
Summery of goodwill |  |  |  |
Balance at December 31, 2010 | $ 1,122,971 | $ 948,026 | $ 948,026 | $ 174,945
Foreign currency translation adjustments | 8,032 |  |  | 8,032
Balance at June 30, 2011 | $ 1,131,003 | $ 948,026 | $ 948,026 | $ 182,977

X
- Definition Carrying amount as of the balance sheet date, which is the cumulative amount paid, adjusted for any amortization recognized prior to adoption of FAS 142 and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 43 + Details
Name: | us-gaap_Goodwill
Namespace Prefix: | us-gaap
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + Details
Name: | us-gaap_GoodwillRollForward
Namespace Prefix: | us-gaap
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Reflects net changes to the recorded value of goodwill for foreign currency translation adjustments and purchase accounting adjustments needed to revise the carrying amount of goodwill to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 + Details
Name: | us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments
Namespace Prefix: | us-gaap
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration