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Variable Interest Entities (Tables)
6 Months Ended
Jun. 30, 2013
Variable Interest Entities [Abstract]  
Schedule of Variable Interest Entities [Table Text Block]
    As of June 30,  As of December 31,  
 (Amounts in thousands)2013  2012  
 Total assets$ -  $ 957,730  
           
 Total liabilities$ -  $ 443,894  
           
 Noncontrolling interest$ -  $ 193,933