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Noncontrolling Interests (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Dec. 31, 2011
Noncontrolling Interest [Line Items]                
Redeemable Noncontrolling Interest Attributable Net Income Loss     $ 551 $ 446        
Redeemable Noncontrolling Interest Redemption Value Change     377 17        
Summary of redeemable noncontrolling interests                
Redeemable noncontrolling interests, Beginning balance     11,047 3,111 9,558   11,259  
mandatorily redeemable noncontrolling interest 992 839 992 839        
Noncontrolling Interest, Change in Redemption Value     8 26        
mandatorily redeemable noncontrolling interests income statement impact     1,000 865        
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   8,161        
Formation of noncontrolling interests     3,600          
Minority Interest Decrease From Distributions To Redeemable Noncontrolling Interest Holders     408 442        
Distribution to noncontrolling interests     (976) (554)        
noncontrolling interest currency translation     (498) (324)        
Redeemable noncontrolling interests, Ending balance $ 11,111 $ 6,985 $ 11,111 $ 6,985   $ 6,991   $ 6,964