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Capital Stock - Narrative (Details)
12 Months Ended
Dec. 31, 2018
stockholder
$ / shares
shares
Dec. 31, 2017
$ / shares
shares
Equity [Abstract]    
Preferred stock, par value (USD per share) | $ / shares $ 0.01 $ 0.01
Preferred stock issued (shares) 0 0
Preferred stock authorized (shares) 500,000 500,000
Number of stockholders | stockholder 8,384  
Common stock outstanding (shares) 17,555,672