Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Narrative (Details)

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Stockholders' Equity - Narrative (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended 22 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Mar. 06, 2017
Equity [Abstract]        
Shares authorized to repurchase       $ 50.0
Repurchase of common stock (in shares) 69   2,500  
Repurchase of common stock $ 1.0 $ 40.0 $ 41.0  
Repurchase of common stock (in dollars per share) $ 14.20   $ 16.23