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Redeemable Noncontrolling Interests (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Redeemable Noncontrolling Interest [Roll Forward]    
Beginning balance $ 10,298 $ 8,908
Distribution to noncontrolling interest (811) 0
Net income (loss) attributable to noncontrolling interest 888 (1,803)
Adjustment to arrive at fair value of interest 6,414 2,827
Ending balance $ 16,789 $ 9,932