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Equity - Additional Information (Details) - $ / shares
Mar. 31, 2016
Dec. 31, 2015
Aug. 07, 2013
Schedule of Equity Method Investments [Line Items]      
Common stock, par value per share $ 0.50 $ 0.50 $ 0.50
Warrant      
Schedule of Equity Method Investments [Line Items]      
Aggregate number of warrants     3,000,000
Number of securities called by warrants     1
Exercise price     $ 40.00