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Redeemable Preferred Stock (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Aug. 18, 2015
Jul. 01, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Mar. 25, 2015
Dec. 31, 2013
Temporary Equity [Line Items]              
Proceeds from issuance of common stock     $ 0 $ 36,066 $ 28,475    
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   0 0 60,600   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 (in shares)         2,163,135    
Common Stock [Member] | Private Placement [Member]              
Temporary Equity [Line Items]              
Stock issued during period (in shares) 294,450