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Stockholders' Equity - Stock Compensation (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock compensation expense   $ 6,175 $ 6,622 $ 13,524
Income tax benefit recognized   (2,322) (2,525) (5,143)
Net stock compensation expense   3,853 $ 4,097 8,381
Unrecognized Stock Compensation Expense   12,295    
Employee Stock Purchase Plan 2015        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock shares authorized (in shares) 1,000,000   1,000,000  
Award purchase period 6 months      
Discount from market price at purchase date 15.00%      
Annual Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expenses recorded   5,191 $ 2,356 1,603
Unrecognized Stock Compensation Expense   $ 7,497    
Weighted-Average Remaining Vesting Period (Years)   1 year 4 months 24 days    
Annual Performance-based Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expenses recorded   $ 1,203 3,807 7,692
Unrecognized Stock Compensation Expense   $ 454    
Weighted-Average Remaining Vesting Period (Years)   1 year    
Stock Appreciation Rights (SARs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expenses recorded   $ (1,949) 893 1,846
Unrecognized Stock Compensation Expense   $ 0    
Weighted-Average Remaining Vesting Period (Years)   0 years    
LTIP PSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expenses recorded   $ (296) (1,511) 1,323
Unrecognized Stock Compensation Expense   $ 0    
Weighted-Average Remaining Vesting Period (Years)   0 years    
Employee Stock Option        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted-Average Remaining Vesting Period (Years)   2 years    
Employee Stock Option | 2017 Long-Term Incentive Plan NQSOs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expenses recorded   $ 694 0 0
Unrecognized Stock Compensation Expense   4,344    
Directors' Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expenses recorded   1,168 1,077 1,060
Employee Stock Purchase Plan 2015        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expenses recorded   164 $ 0 $ 0
Award Granted in 2016 | Long-term Incentive Award        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Maximum compensation cost excluded from unrecognized compensation cost subject to performance condition not considered probable   $ 13,510