XML 59 R43.htm IDEA: XBRL DOCUMENT v3.10.0.1
Stock-Based Compensation - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Grants in period (in shares)     223,570    
Share-based compensation expense $ 3,800 $ 1,300 $ 10,400 $ 7,900  
Accrued employee compensation and benefits 19,308   19,308   $ 13,547
Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total compensation cost not yet recognized $ 20,100   $ 20,100    
Total compensation cost not yet recognized, period for recognition (in years)     1 year 9 months 3 days    
Restricted stock, granted (in shares)     55,584    
Vested in period (in shares)     15,737    
Restricted stock, forfeited (in shares)     71    
Cash-settled restricted stock units, outstanding (in shares) 343,124   343,124   303,348
Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total compensation cost not yet recognized $ 4,100   $ 4,100    
Total compensation cost not yet recognized, period for recognition (in years)     1 year 8 months 1 day    
Performance Shares          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Grants in period (in shares) 25,330        
Performance Based Restricted Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock, granted (in shares) 26,670        
Cash-settled Restricted Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares issued in period (in shares)     59,229    
Vested in period (in shares)     60    
Restricted stock, forfeited (in shares)     3,806    
Cash-settled restricted stock units, outstanding (in shares) 55,363   55,363    
Share-based compensation expense $ 300   $ 700    
LTIP          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period (in years)     3 years    
Share-based compensation expense 1,100 $ 100 $ 1,600 $ (1,000)  
Accrued employee compensation and benefits $ 1,800   $ 1,800   $ 200
LTIP | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Multiplier for target award based on total shareholder return on common stock (percent)     0.00%    
LTIP | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Multiplier for target award based on total shareholder return on common stock (percent)     200.00%