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Equity Method Investment (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Equity Method Investments and Joint Ventures [Abstract]          
Percentage of owned joint venture Investment in nonconsolidated affiliate 50.00%   50.00%    
Investment in unconsolidated affiliate $ 646   $ 646   $ 463
Equity in net income (loss) of unconsolidated affiliate $ 75 $ (56) $ 183 $ (59)