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Stockholders' Equity - LTIP (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended 36 Months Ended
Dec. 31, 2016
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2018
2015 Long-Term Incentive Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in dollars per share)     $ 98.29  
Compensation Cost   $ 1,400    
Compensation expense cumulative amount based on maximum number of units subject to performance objectives probable   $ 6,000    
2016 Long-Term Incentive Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting rights, percentage   90.00%    
Number of shares granted   308,000,000    
Granted (in dollars per share)   $ 50.05    
Compensation expense cumulative amount based on maximum number of units subject to performance objectives probable   $ 2,000    
Restricted Stock Units RSU and Stock Appreciation Rights SARS | Long-term Incentive Award        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vesting Portion, Tranche One   50.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vesting Portion, Tranche Two   50.00%    
Restricted Stock Units RSU and Stock Appreciation Rights SARS | Portion Vesting On December 2010 | Long-term Incentive Award        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting rights, percentage   80.00%    
Restricted Stock Units RSU and Stock Appreciation Rights SARS | Portion Vesting On December 2011 | Long-term Incentive Award        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting rights, percentage   20.00%    
Restricted Stock Units RSU and Stock Appreciation Rights SARS | Portion Vesting On December 2015 | Long-term Incentive Award        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting rights, percentage   80.00%    
Common Stock | 2013 Long-Term Incentive Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares granted   1    
Common Stock | 2015 Long-Term Incentive Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares granted   1    
Common Stock | 2016 Long-Term Incentive Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares granted   1    
Scenario, Forecast | 2016 Long-Term Incentive Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award requisite service period (in years)       36 months
Scenario, Forecast | Restricted Stock Units RSU and Stock Appreciation Rights SARS | Portion Vesting On December 2016 | Long-term Incentive Award        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting rights, percentage 20.00%      
Minimum | 2015 Long-Term Incentive Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Revenue targets to be met for awards to be vested   $ 2,155,000    
EBITDA targets to be met for awards to be vested   336,000    
Maximum | 2015 Long-Term Incentive Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Revenue targets to be met for awards to be vested   2,447,000    
EBITDA targets to be met for awards to be vested   $ 394,000    
Number of shares granted     160,000,000  
Maximum | 2016 Long-Term Incentive Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Financial performance achievement, percentage   200.00%