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Stockholders' Equity (Details)
$ in Millions
1 Months Ended 12 Months Ended
Dec. 16, 2014
Jan. 31, 2015
USD ($)
shares
Jan. 31, 2016
USD ($)
shares
Dec. 31, 2014
USD ($)
shares
Dec. 31, 2013
USD ($)
shares
Stockholders Equity Note [Line Items]          
Anti-dilutive securities excluded from determination of diluted earnings per common share   100,000 0 100,000 100,000
Unvested shares, distribution date conversion ratio 1.8139   1.8139    
Restricted Stock          
Stockholders Equity Note [Line Items]          
Restricted stock and restricted stock unit grants, vesting period     4 years    
Share based compensation | $   $ 0.5 $ 11.4 $ 3.5 $ 3.5
Unrecognized compensation cost | $     $ 36.6    
Restricted stock units granted   288,600 497,800    
Restricted stock units forfeited   4,900 58,400    
Outstanding restricted stock units   559,200 827,200 275,500