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Convertible Subordinated Debt (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Jun. 03, 2011
Debt Instrument [Line Items]      
Equity value $ 35,215 $ 41,738 $ 36,811
Volatility 30.00% 35.00% 70.00%
Risk free return 0.28% 0.67% 1.60%
Dividend yield 2.47% 2.15% 2.51%
Strike price $ 3.84 $ 3.88 $ 4.65