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Stockholders' Equity - Stock Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2014
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expenses recorded $ 2,865 $ 6,622 $ 13,524 $ 13,136
Stock compensation expense   6,622    
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense (1,082) (2,525) (5,143) (4,950)
Allocated Share-based Compensation Expense, Net of Tax 1,783 4,097 8,381 8,186
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   6,702    
Award Granted in 2015 | 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   9,657    
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   13,950    
Nonvested stock units issued (NSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expenses recorded 1,863 6,163 9,295 10,545
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   $ 6,568    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition   1 year 2 months 12 days    
Stock Appreciation Rights (SARs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expenses recorded 381 $ 893 1,846 1,302
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   $ 117    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition   9 months 18 days    
Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expenses recorded 354 $ (1,511) 1,323 287
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   $ 17    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition   9 months 18 days    
Directors' Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expenses recorded $ 267 $ 1,077 $ 1,060 $ 1,002