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Investments in Unconsolidated Investees - Balance Sheet Data (Details) - Investments - Equity Method and Joint Ventures - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Schedule of financial data of unconsolidated investees, Balance Sheet Data    
Current assets $ 2,644 $ 8,687
Noncurrent assets 273 10,108
Current liabilities 676 3,760
Noncurrent liabilities $ 35 $ 3,395