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Redeemable Preferred Stock (Details)
$ / shares in Units, $ in Thousands
9 Months Ended 12 Months Ended
Oct. 01, 2015
USD ($)
$ / shares
shares
Sep. 30, 2015
$ / shares
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Temporary Equity [Abstract]          
Redeemable Preferred Stock, par value per share $ 1        
Redeemable Preferred Stock, liquidation value per share $ 1,000        
Redeemable preferred shares outstanding | shares 10,510        
Redeemable Preferred Stock, redemption value per share $ 1,000        
Redeemable preferred stock redemption amount | $ $ 10,500   $ 0 $ 0 $ 10,510
Dividends payable per share   $ 80      
Number of times dividends payable in a year per share   4