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Stock-Based Compensation - Performance Stock Units (Details) - Performance Shares - $ / shares
1 Months Ended 6 Months Ended 12 Months Ended
Feb. 28, 2018
Feb. 28, 2017
Feb. 29, 2016
Dec. 31, 2015
Sep. 30, 2015
Dec. 31, 2018
Performance Stock Units Activity and Outstanding            
Outstanding, beginning of period (in shares)           172,000
Granted (in shares)           124,000
Forfeited (in shares)           (25,000)
Vested (in shares)           (50,000)
Outstanding, end of period (in shares)           221,000
Performance Stock Units Activity and Weighted Average Grant Date Fair Value per Share            
Beginning of period, Weighted Average Grant Date Fair Value (in dollars per share)           $ 17.65
Granted, Weighted Average Grant Date Fair Value (in dollars per share)           12.13
Forfeited, Weighted Average Grante Date Fair Value (in dollars per share)           15.26
Vested, Weighted Average Grant Date Fair Value (in dollars per share)           17.61
End of period, Weighted Average Grant Date Fair Value (in dollars per share)           $ 14.73
Minimum | Key Executive Employees Member            
Performance Stock Units Activity and Weighted Average Grant Date Fair Value per Share            
Vesting percentage           60.00%
Maximum | Key Executive Employees Member            
Performance Stock Units Activity and Weighted Average Grant Date Fair Value per Share            
Vesting percentage           150.00%
April And September 2015 PSU Awards | Key Executive Employees Member            
Performance Stock Units Activity and Outstanding            
Granted (in shares)         56,820  
Outstanding, end of period (in shares)           49,953
Performance Stock Units Activity and Weighted Average Grant Date Fair Value per Share            
Vesting period           3 years
Achievement percentage         111.00%  
April And September 2015 PSU Awards | Minimum | Key Executive Employees Member            
Performance Stock Units Activity and Weighted Average Grant Date Fair Value per Share            
Vesting percentage           60.00%
April And September 2015 PSU Awards | Maximum | Key Executive Employees Member            
Performance Stock Units Activity and Weighted Average Grant Date Fair Value per Share            
Vesting percentage           150.00%
December 2015 PSU Awards | Key Executive Employees Member            
Performance Stock Units Activity and Outstanding            
Granted (in shares)       117,230    
Performance Stock Units Activity and Weighted Average Grant Date Fair Value per Share            
Vesting period           3 years
December 2015 PSU Awards | Minimum | Key Executive Employees Member            
Performance Stock Units Activity and Weighted Average Grant Date Fair Value per Share            
Vesting percentage           60.00%
December 2015 PSU Awards | Maximum | Key Executive Employees Member            
Performance Stock Units Activity and Weighted Average Grant Date Fair Value per Share            
Vesting percentage           150.00%
February 2016 PSU Awards | Key Executive Employees Member            
Performance Stock Units Activity and Outstanding            
Granted (in shares)     54,818      
Outstanding, end of period (in shares)           47,800
Performance Stock Units Activity and Weighted Average Grant Date Fair Value per Share            
Vesting period           3 years
Achievement percentage     0.00%      
February 2016 PSU Awards | Minimum | Key Executive Employees Member            
Performance Stock Units Activity and Weighted Average Grant Date Fair Value per Share            
Vesting percentage           60.00%
February 2016 PSU Awards | Maximum | Key Executive Employees Member            
Performance Stock Units Activity and Weighted Average Grant Date Fair Value per Share            
Vesting percentage           150.00%
February 2017 PSU Awards | Key Executive Employees Member            
Performance Stock Units Activity and Outstanding            
Granted (in shares)   72,017        
Outstanding, end of period (in shares)           58,500
Performance Stock Units Activity and Weighted Average Grant Date Fair Value per Share            
Vesting period           3 years
Achievement percentage   0.00%        
February 2017 PSU Awards | Minimum | Key Executive Employees Member            
Performance Stock Units Activity and Weighted Average Grant Date Fair Value per Share            
Vesting percentage           60.00%
February 2017 PSU Awards | Maximum | Key Executive Employees Member            
Performance Stock Units Activity and Weighted Average Grant Date Fair Value per Share            
Vesting percentage           150.00%
February 2018 PSU Awards | Key Executive Employees Member            
Performance Stock Units Activity and Outstanding            
Granted (in shares) 119,351          
Outstanding, end of period (in shares)           115,000
Performance Stock Units Activity and Weighted Average Grant Date Fair Value per Share            
Vesting period           3 years
February 2018 PSU Awards | Minimum | Key Executive Employees Member            
Performance Stock Units Activity and Weighted Average Grant Date Fair Value per Share            
Vesting percentage           60.00%
February 2018 PSU Awards | Maximum | Key Executive Employees Member            
Performance Stock Units Activity and Weighted Average Grant Date Fair Value per Share            
Vesting percentage           150.00%