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Redeemable Preferred Stock (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended 12 Months Ended
Aug. 18, 2015
Jul. 01, 2015
Dec. 31, 2014
Jun. 30, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Mar. 25, 2015
Dec. 31, 2012
Temporary Equity [Line Items]                  
Shares outstanding     60,600   0 60,600      
Proceeds from issuance of common stock     $ 20,179 $ 8,295 $ 36,066 $ 28,475 $ 0    
Private Placement [Member]                  
Temporary Equity [Line Items]                  
Proceeds from issuance of common stock $ 3,100                
Redeemable Preferred Stock [Member]                  
Temporary Equity [Line Items]                  
Shares outstanding 0   60,600   0 60,600 0   0
Liquidation event, percentage of holders with consent (more than)               80.00%  
Redemption price (in dollars per share)   $ 100              
Number of shares repurchased during the period   29,550              
Stock repurchased during period, percentage   49.00%              
Payments of dividends $ 6,300                
Common Stock [Member]                  
Temporary Equity [Line Items]                  
Stock issued during period     1,480,786 682,349   2,163,135      
Common Stock [Member] | Private Placement [Member]                  
Temporary Equity [Line Items]                  
Stock issued during period 294,450