Annual report pursuant to Section 13 and 15(d)

Stock Based Compensation (Details 2)

v2.4.0.8
Stock Based Compensation (Details 2) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Nonvested Restricted Share Activity (time-based) [Member]
      
Nonvested Restricted Share Activity (time-based and performance-based), Number of Shares [Roll Forward]      
Outstanding at Beginning of the Year (shares) 825,650 649,516 465,251
Granted (shares) 355,795 386,500 357,000
Vested (Earned/Released) (shares) (215,850) (166,566) (141,335)
Forfeited (shares) (81,700) [1] (43,800) [1] (31,400) [1]
Outstanding at End of the Year (shares) 883,895 825,650 649,516
Nonvested Restricted Share Activity (time-based and performance-based), Weighted Average Grant Date Fair Value [Roll Forward]      
Outstanding at Beginning of the Year (in dollars per share) $ 25.43 $ 22.68 $ 19.01
Granted (in dollars per share) $ 42.78 $ 27.21 $ 25.57
Vested (Earned/Released) (in dollars per share) $ 41.72 $ 18.92 $ 17.76
Forfeited (in dollars per share) $ 31.27 [1] $ 25.10 [1] $ 23.23 [1]
Outstanding at End of the Year (in dollars per share) $ 32.22 $ 25.43 $ 22.68
Nonvested Restricted Share Activity (performance- based) [Member]
      
Nonvested Restricted Share Activity (time-based and performance-based), Number of Shares [Roll Forward]      
Outstanding at Beginning of the Year (shares) 180,000 191,250 202,500
Granted (shares) 62,500 56,250 56,250
Vested (Earned/Released) (shares) (67,500) (33,750) (33,750)
Forfeited (shares) 0 [1] (33,750) [1] (33,750) [1]
Outstanding at End of the Year (shares) 175,000 180,000 191,250
Nonvested Restricted Share Activity (time-based and performance-based), Weighted Average Grant Date Fair Value [Roll Forward]      
Outstanding at Beginning of the Year (in dollars per share) $ 22.81 $ 20.41 $ 16.91
Granted (in dollars per share) $ 42.56 $ 20.72 $ 25.65
Vested (Earned/Released) (in dollars per share) $ 41.97 $ 14.27 $ 14.27
Forfeited (in dollars per share)   $ 14.27 [1] $ 14.27 [1]
Outstanding at End of the Year (in dollars per share) $ 30.10 $ 22.81 $ 20.41
[1] Forfeitures on time-based nonvested shares are a result of terminations of employment, while forfeitures on performance-based nonvested shares are a result of failing to attain certain goals as outlined in our executive management group's compensation agreements.