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Noncontrolling Interests (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Summary of redeemable noncontrolling interests    
Noncontrolling interest expense, Income Statement Impact $ 749 $ 739
Noncontrolling Interests [Roll Forward]    
Redeemable noncontrolling interests, beginning balance 11,077  
Redemption value change 877 417
Purchase of noncontrolling interests (690) 30
Distribution to noncontrolling interests (1,118) (970)
Redeemable noncontrolling interests, ending balance 11,183  
Mandatorily Redeemable Noncontrolling Interests [Member]    
Summary of redeemable noncontrolling interests    
Noncontrolling interest expense, Income Statement Impact 749 739
Redemption value change, Income Statement Impact (78) 237
Noncontrolling Interests [Roll Forward]    
Redeemable noncontrolling interests, beginning balance 9,405 9,355
Redemption value change 671 976
Purchase of noncontrolling interests (803)  
Distribution to noncontrolling interests (728) (679)
Currency translation adjustment (136) (30)
Redeemable noncontrolling interests, ending balance 8,409 9,622
Redeemable Noncontrolling Interests [Member]    
Summary of redeemable noncontrolling interests    
Noncontrolling interest expense, Income Statement Impact 681 589
Redemption value change, Income Statement Impact 196 (172)
Noncontrolling Interests [Roll Forward]    
Redeemable noncontrolling interests, beginning balance 11,077 10,678
Redemption value change 877 417
Formation of noncontrolling interests   855
Purchase of noncontrolling interests   (356)
Distribution to noncontrolling interests (771) (610)
Redeemable noncontrolling interests, ending balance $ 11,183 $ 10,984