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Agreements and Transactions of Related Parties (Details 4) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Redeemable Noncontrolling Interests  
Balance - beginning balance $ 0
Reclassification from permanent equity to temporary equity 85,000
Redemption of securities (45,000)
Balance - end of period $ 40,000