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Accounting Policies - Financial Data for Variable Interest Entities - Balance Sheet (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Accounting Policies [Abstract]    
Current assets $ 47,970 $ 57,046
Non-current assets 39,938 43,165
Current liabilities 19,860 22,525
Non-current liabilities $ 29,457 $ 36,155