Quarterly report pursuant to Section 13 or 15(d)

Common Stock Repurchase Plan (Details)

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Common Stock Repurchase Plan (Details) - The Program - Common Stock - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended 16 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Mar. 06, 2017
Class of Stock [Line Items]      
Stock repurchase program, authorized amount     $ 50.0
Common stock repurchased (in shares) 69,000 2,500,000  
Common stock repurchased, value $ 1.0 $ 41.0  
Common stock repurchased (in dollars per share) $ 14.20 $ 16.23