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Segment Information Total Assets (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Segment Reporting, Asset Reconciling Item [Line Items]    
Percentage of assets, minimum for disclosure 10.00%  
Long-Lived Assets $ 2,032,814 $ 1,774,476
North America [Member]
    
Segment Reporting, Asset Reconciling Item [Line Items]    
Long-Lived Assets 1,135,772 [1],[2] 989,170 [1],[2]
International [Member]
    
Segment Reporting, Asset Reconciling Item [Line Items]    
Long-Lived Assets 897,042 [2],[3] 785,306 [2],[3]
United States [Member]
    
Segment Reporting, Asset Reconciling Item [Line Items]    
Long-Lived Assets $ 1,084,300 $ 981,000
Netherlands [Member]
    
Segment Reporting, Asset Reconciling Item [Line Items]    
Percentage of assets 11.50%  
[1] North America contains assets from the United States of $981.0 million and $1,084.3 million at December 31, 2011 and September 30, 2012, respectively.
[2] The December 31, 2011 total asset amounts have been reclassified in the disclosure above to conform to the current presentation, which excludes intercompany balances.
[3] Total assets in the Netherlands represented approximately 11.5% of consolidated total assets at September 30, 2012. There were no other individual countries located outside of the United States that represented more than 10% of consolidated total assets at December 31, 2011 or September 30, 2012.