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Stock-Based Incentive Plan - Fair Value Inputs and Assumptions (Details) - Restricted Stock, Market-Based - $ / shares
6 Months Ended 12 Months Ended
Dec. 31, 2015
Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fair value at grant date, per share (in dollars per share) $ 4.58  
Vesting period 3 years 303 days  
Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fair value at grant date, per share (in dollars per share) $ 2.93 $ 4.26
Vesting period   3 years 109 days
Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fair value at grant date, per share (in dollars per share) $ 5.07 $ 8.40
Vesting period   2 years 200 days