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Employee Benefit Plans - Schedule of Restricted Stock and Restricted Stock Units Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Jan. 31, 2015
Jan. 31, 2014
Shares          
Awards outstanding at beginning of year (in shares) 554,960 771,942 1,191,402    
Granted (in shares) 501,076 139,455 168,468    
Vested (in shares) (332,223) (356,437) (502,022)    
Forfeited (in shares) (62,689) 0 (85,906)    
Awards outstanding at end of year (in shares) 661,124 554,960 771,942    
Grant Date Fair Value          
Awards outstanding at beginning of year (in dollars per share) $ 17.54 $ 13.62 $ 14.14    
Granted (in dollars per share) 15.57 23.22 21.63    
Vested (in dollars per share) 16.44 11.27 17.50    
Forfeited (in dollars per share) 20.93 0.00 13.79    
Awards outstanding at end of year (in dollars per share) $ 16.28 $ 17.54 $ 13.62    
Fair value of awards vested $ 5.1 $ 8.2 $ 11.0    
Restricted Stock Units (RSUs) [Member]          
Shares          
Awards outstanding at beginning of year (in shares) 33,760        
Awards outstanding at end of year (in shares)   33,760      
Grant Date Fair Value          
Awards outstanding at beginning of year (in dollars per share) $ 15.80        
Awards outstanding at end of year (in dollars per share)   $ 15.80      
Recorded liability   $ 0.2 $ 1.3    
Long-term incentive cash awards paid       $ 0.7 $ 0.8