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Stockholders' Equity - LTIP (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
1 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2011
Nov. 30, 2015
Sep. 30, 2014
Dec. 31, 2013
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
2007 LTIP SARs and 2007 LTIP PSUs | Long Term Incentive Award                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting portion one     50.00%              
Vesting portion two   50.00%                
Compensation expenses reversed               $ 2,400    
LTIP PSUs | Long Term Incentive Award                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Compensation expenses reversed                 $ 1,400  
Award vesting period (in years)       3 years 3 years 3 years        
Granted (in dollars per share)                   $ 98.29
2013 LTIP PSUs | Long Term Incentive Award                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Compensation expenses reversed                   $ 700
2016 LTIP PSUs | Long Term Incentive Award                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Granted (in dollars per share)                 $ 50.05  
Award requisite service period                 36 months  
LTIP NQSOs | 2018 Long-Term Incentive Plan NQSOs                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Stock granted net of forfeitures             $ 4,719      
LTIP NQSOs | Long Term Incentive Plan NQSOs                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting period (in years)               3 years    
LTIP NQSOs | 2017 Long-Term Incentive Plan NQSOs                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Stock granted net of forfeitures             $ 4,825      
Vesting December 2015 | 2007 LTIP SARs and 2007 LTIP PSUs | Long Term Incentive Award                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting rights percentage   80.00%                
Vesting December 2016 | 2007 LTIP SARs and 2007 LTIP PSUs | Long Term Incentive Award                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting rights percentage 20.00%                  
Maximum | LTIP PSUs | Long Term Incentive Award                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Granted (in shares)                   160,000
Financial performance achievement percentage       200.00%            
Maximum | 2016 LTIP PSUs | Long Term Incentive Award                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Granted (in shares)                 308,000  
Minimum | LTIP PSUs | Long Term Incentive Award                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Financial performance achievement percentage       90.00%