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Non-Recourse Obligations of Variable Interest Entity (Schedule of Non-recourse Obligations) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
For the year ending December 31,      
Less: net income (loss) attributable to noncontrolling interest     $ 11,403
Net cash from operating activities $ 302,881 $ 325,751 $ 289,898