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Summarized Financial Information of Unconsolidated Joint Ventures (Assets, Liabilities, and Equity) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Equity Method Investments and Joint Ventures [Abstract]    
Current assets $ 28,239 $ 31,155
Noncurrent assets 7,207 9,427
Current liabilities 4,608 6,473
Shareholders' equity $ 30,838 $ 34,109