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Equity Incentive Plans - Restricted Stock and Restricted Stock Units (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Oct. 28, 2016
Aug. 09, 2016
Jun. 15, 2016
Mar. 31, 2017
Dec. 31, 2016
Weighted - Average Fair Value          
Weighted average period       1 year 9 months 18 days  
PSUs          
Number of RSUs and PSUs          
Vested (in shares)       0  
Weighted - Average Fair Value          
Unrecognized compensation expense       $ 12.2  
Compensation expense       1.7  
RSUs          
Weighted - Average Fair Value          
Unrecognized compensation expense       15.3  
Compensation expense       $ 2.1  
Common stock issued, restricted stock awards       358,379  
Equity Appreciation Rights          
Weighted - Average Fair Value          
Accrued compensation and benefits         $ 151.5
Omnibus Incentive 2015 Plan          
Restricted Stock and Restricted Stock Units          
Share reserved for issuance       4,501,257  
Omnibus Incentive 2015 Plan | PSUs          
Weighted - Average Fair Value          
Percentage of awards granted       50.00%  
Performance period       3 years  
Omnibus Incentive 2015 Plan | PSUs | Minimum          
Weighted - Average Fair Value          
Awards earned as percentage of specified compensation       0.00%  
Omnibus Incentive 2015 Plan | PSUs | Maximum          
Weighted - Average Fair Value          
Awards earned as percentage of specified compensation       200.00%  
Omnibus Incentive 2015 Plan | RSUs          
Weighted - Average Fair Value          
Percentage of awards granted       50.00%  
Omnibus Incentive 2015 Plan | RSUs and PSUs          
Number of RSUs and PSUs          
Outstanding at beginning of the period       2,459,166  
Vested (in shares)       (409,846)  
Forfeited (in shares)       (110,136)  
Outstanding at end of the period       1,939,184  
Weighted - Average Fair Value          
Outstanding at beginning of the period       $ 20.40  
Granted        
Outstanding at end of the period       $ 20.40  
Fair Value of grant $ 0.6 $ 3.8 $ 45.8