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Noncontrolling Interests (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Mandatorily Redeemable Noncontrolling Interests [Roll Forward]    
Mandatorily redeemable noncontrolling interests, beginning balance $ 9,355 $ 11,047
Noncontrolling interest expense 1,172 1,475
Purchase of noncontrolling interests 29 (5,285)
Distribution to noncontrolling interests (1,627) (1,175)
Mandatorily redeemable noncontrolling interests, ending balance 9,420 10,059
Redeemable Noncontrolling Interests [Roll Forward]    
Redeemable noncontrolling interests, beginning balance 10,678 6,991
Noncontrolling interest expense 940 900
Redemption value change (217) 252
Redemption value change, redeemable noncontrolling interest 723 1,152
Formation of noncontrolling interests   3,600
Redeemable noncontrolling interests, ending balance 11,014 11,031
Securities Subject to Mandatory Redemption [Member]
   
Mandatorily Redeemable Noncontrolling Interests [Roll Forward]    
Redemption value change 315 134
mandatorily redeemable noncontrolling interests income statement impact 1,487 1,609
Purchase of noncontrolling interests   (658)
Dissolution of noncontrolling interests   (357)
Distribution to noncontrolling interests (1,064) (1,437)
Currency translation adjustment (358) (145)
Redeemable Noncontrolling Interests [Member]
   
Mandatorily Redeemable Noncontrolling Interests [Roll Forward]    
Purchase of noncontrolling interests (356)  
Redeemable Noncontrolling Interests [Roll Forward]    
Redemption value change, redeemable noncontrolling interest 723 1,152
Formation of noncontrolling interests 855  
Distribution to noncontrolling interests $ (886) $ (712)