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Noncontrolling Interests (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Dec. 31, 2011
Noncontrolling Interest [Line Items]                
Redeemable Noncontrolling Interest Attributable Net Income Loss     $ 900 $ 666        
Redeemable Noncontrolling Interest Redemption Value Change     252 36        
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest 1,152 702 1,152 702        
Summary of redeemable noncontrolling interests                
Redeemable noncontrolling interests, Beginning balance     11,047 3,111 10,059   11,683  
mandatorily redeemable noncontrolling interest 1,475 1,359 1,475 1,359        
Noncontrolling Interest, Change in Redemption Value     134 117        
mandatorily redeemable noncontrolling interests income statement impact     1,609 1,476        
Noncontrolling Interest, Increase from Equity Issuance or Sale of Parent Equity Interest     (357)          
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests     (658)          
Noncontrolling Interest, Increase from Business Combination   8,161 (5,406) 8,161        
Formation of noncontrolling interests     3,600          
Minority Interest Decrease From Distributions To Redeemable Noncontrolling Interest Holders     712 691        
Distribution to noncontrolling interests     (1,437) (1,009)        
noncontrolling interest currency translation     (145) (56)        
Redeemable noncontrolling interests, Ending balance $ 11,031 $ 6,975 $ 11,031 $ 6,975   $ 6,991   $ 6,964