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Stockholders' equity and dividend payment, Series D Junior Participating Preferred stock (Details) - BW Group [Member] - shares
 3 Months Ended
Mar. 23, 2017
Jun. 30, 2017
Common Stock [Member]    
Series D junior participating preferred stock [Abstract]    
Preferred stock convertible to common stock (in shares)   15,700,000
Series D junior participating preferred stock [Member]    
Series D junior participating preferred stock [Abstract]    
Number of shares converted to common stock (in shares) 15,700