v2.4.0.8
Stock-based Compensation (Tables)
12 Months Ended
Dec. 31, 2013
Stock-based Compensation [Abstract]  
Schedule of weighted average assumptions
   
2013
   
2012
   
2011
 
Expected term (in years)
    3.1       3.0       3.0  
Expected volatility
    39 %     46 %     54 %
Risk-free interest rate
    0.5 %     0.3 %     1.4 %
Expected dividend yield
    0 %     0 %     0 %
Schedule of summary of option activity
   
 
 
Shares
   
Weighted
Average
Exercise Price
   
Weighted-Average
Remaining
Contractual
Life (Years)
   
Aggregate Intrinsic
Value (amounts in
thousands)
 
                         
Outstanding at January 1, 2013
    438,693     $ 10.72              
                             
Granted
    55,000       41.93              
Exercised
    (229,506 )     7.62              
                             
Outstanding at December 31, 2013
    264,187       19.90      2.1     $ 10,133  
                               
Exercisable at December 31, 2013
    254,187       18.94      2.0       9,994  
Schedule of summary of restricted stock activity
   
 
 
Shares
   
Weighted
Average
Grant-Date Fair
Value
 
             
Non-vested at January 1, 2013
    205,650     $ 27.94  
                 
Granted
    126,000       46.80  
Vested
    (73,500 )     26.70  
Forfeited
    (21,200 )     37.25  
                 
Non-vested at December 31, 2013
    236,950       37.24