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Stock Incentive Plan - Narratives (Details)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Nov. 02, 2017
shares
May 03, 2017
shares
Jul. 14, 2015
shares
Dec. 31, 2017
USD ($)
$ / shares
D
shares
Mar. 31, 2018
USD ($)
$ / shares
shares
Mar. 31, 2018
USD ($)
$ / shares
shares
Mar. 31, 2017
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Non-vested options outstanding         3,287,996 3,287,996  
Unrecognized compensation costs related to non-vested share-based compensation | $           $ 19,500  
Weighted-average period recognized           1 year 10 months 24 days  
Stock vesting period           4 years  
Performance Units available for grant         8,304,978 8,304,978  
Non-qualifed stock options grant date value | $         $ 26,807 $ 26,807  
Restricted Stock [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Restricted stock units granted           35,366  
CEO | Nonqualified Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock vesting period       4 years      
Non-qualifed stock options granted       168,461      
Non-qualifed stock options grant date value | $       $ 1,100      
Non-qualifed stock options service period       4 years      
Targeted share price | $ / shares       35.58      
Number of trading days | D       15      
CEO | Nonqualified Plan Two Member              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock vesting period       4 years      
Non-qualifed stock options granted       151,678      
Non-qualifed stock options grant date value | $       $ 1,000      
Non-qualifed stock options service period       4 years      
Targeted share price | $ / shares       23.72      
Number of trading days | D       15      
Executive Officers [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Restricted stock units granted           35,366  
Restricted stock units, closing price | $ / shares         $ 8.46 $ 8.46  
Unrecognized compensation costs related to non-vested share-based compensation | $           $ 100  
Weighted-average period recognized           1 year 2 months 12 days  
Executive Officers [Member] | Restricted Stock [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock-based compensation expense related stock options | $         $ 62 $ 168  
Employees, Executive Officers and Non-Employee Board Members [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock-based compensation expense related stock options | $           $ 2,700 $ 2,600
Goldenberg Agreement | Employment Agreement              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Restricted stock units granted   1,500,000          
Goldenberg Agreement | Employment Agreement | Restricted Units Vesting Based on Certain Market Conditions              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Restricted stock units granted 1,500,000            
Stock vesting period     3 years        
Performance Units available for grant     1,500,000        
Minimum | Executive Officers [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock vesting period           1 year  
Maximum | Executive Officers [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock vesting period           3 years