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Capital Stock (Details) - $ / shares
Jan. 20, 2017
Dec. 31, 2016
Dec. 31, 2015
Subsequent Event [Line Items]      
Shares of common stock authorized (in shares)   100,000,000 100,000,000
Shares issued and outstanding (in shares)   50,000,000 48,900,000
Maximum shares allowed for issuance (in shares)   2,000,000.0  
Par value (in dollars per share)   $ 10  
Subsequent Event      
Subsequent Event [Line Items]      
Dividend declared (in dollars per share) $ 0.10