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Stock-Based Compensation Plans and Employee Benefits (Stock-based Compensation) (Details)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Jan. 30, 2015
shares
Jan. 31, 2015
Jan. 31, 2014
Jun. 30, 2015
USD ($)
shares
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Installment
shares
Jun. 30, 2014
USD ($)
shares
Feb. 01, 2013
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock-based compensation expense | $       $ 3,947 $ 3,196 $ 7,186 $ 5,271  
Unrecognized compensation cost | $       2,800   $ 2,800    
Weighted-average period to recognize the unrecognized compensation cost           1 year 3 months 29 days    
Deferred compensation share-based arrangements, liability, current and noncurrent | $       $ 13,800   $ 13,800    
2013 Performance Incentive Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of Points Issued           10 73  
2014 Performance Incentive Plan [Member] [Domain]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of Points Issued           34    
Long-term Incentive Plan 2006 and 2009                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares available for issuance       3,700,000   3,700,000    
Employees | Common Stock Subject to Sales Restriction                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vested, Number of Shares           318,482    
Granted, Number of Shares           318,482    
Restricted shares awarded           189,241    
Sale restriction period           2 years    
Employees | Service Based Restricted Stock Units Vesting on December 31, 2017                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Granted units 64,196              
Non-vested, outstanding (in shares)       62,854   62,854    
Employees | Performance-based restricted stock units vesting on December 31, 2016                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Non-vested, outstanding (in shares)       49,613   49,613    
Risk-free interest rate     0.76%          
Expected stock price volatility     44.84%          
Employees | Performance-based restricted stock units vesting on December 31, 2016 | Minimum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting percentage     0.00%          
Employees | Performance-based restricted stock units vesting on December 31, 2016 | Maximum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting percentage     200.00%          
Employees | Performance Based Restricted Stock Units Vesting on December 31, 2017                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Granted units 49,650              
Non-vested, outstanding (in shares)       49,075   49,075    
Risk-free interest rate   0.75%            
Expected stock price volatility   28.14%            
Employees | Performance Based Restricted Stock Units Vesting on December 31, 2017 | Minimum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting percentage   0.00%            
Employees | Performance Based Restricted Stock Units Vesting on December 31, 2017 | Maximum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting percentage   200.00%            
Employees | Service Based Restricted Stock Units Vesting on December 31, 2016                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Non-vested, outstanding (in shares)       63,378   63,378    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vesting Installments, Number | Installment           1    
Employees | Service-based restricted stock units vesting on February 1, 2016                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Non-vested, outstanding (in shares)               194,582
Employees | Service based restricted stock units with specified vesting dates                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Non-vested, outstanding (in shares)       10,666   10,666    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vesting Installments, Number | Installment           1    
Employees | Service based restricted stock units with specified vesting dates | Minimum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting term           3 years