Annual report pursuant to Section 13 and 15(d)

Stock Based Compensation (Details 2)

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Stock Based Compensation (Details 2) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
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) 649,516 465,251 305,279
Granted (shares) 386,500 357,000 315,000
Vested (Earned/Released) (shares) (166,566) (141,335) (118,278)
Forfeited (shares) (43,800) [1] (31,400) [1] (36,750) [1]
Outstanding at End of the Year (shares) 825,650 649,516 465,251
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) $ 22.68 $ 19.01 $ 19.11
Granted (in dollars per share) $ 27.21 $ 25.57 $ 21.30
Vested (Earned/Released) (in dollars per share) $ 18.92 $ 17.76 $ 24.75
Forfeited (in dollars per share) $ 25.10 [1] $ 23.23 [1] $ 20.99 [1]
Outstanding at End of the Year (in dollars per share) $ 25.43 $ 22.68 $ 19.01
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) 191,250 202,500 202,500
Granted (shares) 56,250 56,250 67,500
Vested (Earned/Released) (shares) (33,750) (33,750) (67,500)
Forfeited (shares) (33,750) [1] (33,750) [1] 0 [1]
Outstanding at End of the Year (shares) 180,000 191,250 202,500
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) $ 20.41 $ 16.91 $ 14.27
Granted (in dollars per share) $ 20.72 $ 25.65 $ 22.18
Vested (Earned/Released) (in dollars per share) $ 14.27 $ 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) $ 22.81 $ 20.41 $ 16.91
[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.