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Capital Structure (Narrative) (Details)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Dec. 09, 2016
USD ($)
Oct. 06, 2016
USD ($)
item
$ / shares
shares
Jun. 29, 2016
USD ($)
Feb. 03, 2016
USD ($)
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2015
USD ($)
shares
Number of investors | item   2          
Number of shares | shares   2,500,000          
Price per share | $ / shares   $ 9.00          
Gross proceeds from transaction $ 45.0 $ 45.0          
Common stock repurchased, shares | shares         749,213 3,137,609 749,213
Purchase price of common stock         $ 11.2 $ 31.6 $ 11.2
Maximum [Member]              
Stock repurchased, value       $ 100.0      
10b5 Plan [Member]              
Stock repurchased, value     $ 50.0