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Equity (Details 2) (USD $)
 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2008
Dec. 31, 2012
Stock Options
Dec. 31, 2011
Stock Options
Dec. 31, 2012
Restricted stock
Dec. 31, 2011
Restricted stock
Dec. 31, 2012
Restricted stock
$ 31.87 per share
Vesting ratably over three-year period from the grant date
Dec. 31, 2012
Restricted stock
$ 31.77 per share
Vesting on June 15, 2015
Dec. 31, 2012
Restricted stock
$ 31.77 per share
Vesting on January 10, 2016
Dec. 31, 2012
Restricted stock
$ 31.77 per share
Vesting ratably over five-year period from the grant date
Dec. 31, 2011
Restricted stock
$ 28.70 per share
Vesting ratably over three-year period from the grant date
Jan. 31, 2013
Restricted stock
$ 36.26 per share
Subsequent Event
Jan. 31, 2013
Restricted stock
$ 36.26 per share
Subsequent Event
Vesting on June 1, 2016
Dec. 31, 2012
Restricted stock
$ 34.90 per share
Vesting ratably over five-year period from the grant date
Dec. 31, 2012
Restricted stock
$ 34.90 per share
Vesting on December 20, 2015
Stock Based Compensation Plans                              
Number of shares of common stock that have been reserved for awards (in shares)   600,000                          
Compensation expense         $ 1,809,000 $ 1,450,000                  
Number of shares granted (in shares)                     6,000 20,000 20,000    
Price per share             $ 31.87 $ 31.77 $ 31.77 $ 31.77 $ 28.70 $ 36.26 $ 36.26 $ 34.90 $ 34.90
Vesting period             3 years     5 years 3 years     5 years  
Restricted stock activity                              
Outstanding at the beginning of the year (in shares)         165,134 217,317                  
Granted (in shares)         90,500 6,000 8,000 30,000 12,200 14,000       6,300 20,000
Vested (in shares)         (60,185) (58,183)                  
Outstanding at the end of the year (in shares)         195,449 165,134                  
Total compensation cost         5,041,000                    
Nonqualified stock option activity                              
Outstanding at the beginning of the year (in shares)     180,334 185,334                      
Exercised (in shares) (85,000)   (85,000) (5,000)                      
Outstanding at the end of the year (in shares)     95,334 180,334                      
Exercisable at the end of the period (in shares)     95,334 175,334                      
Weighted Average Price                              
Outstanding at the beginning of the year (in dollars per share)     $ 23.33 $ 23.34                      
Exercised (in dollars per share)     $ 22.66 $ 23.79                      
Outstanding at the end of the year (in dollars per share)     $ 23.93 $ 23.33                      
Exercisable at the end of the period (in dollars per share)     $ 23.93 $ 23.29                      
Aggregate intrinsic value of exercisable options at the end of the year     1,074,000                        
Weighted average remaining contractual life of options exercisable     3 years 10 months 24 days                        
Options Exercised (in shares) 85,000   85,000 5,000                      
Weighted Average Exercise Price (in dollars per share)     $ 22.66 $ 23.79                      
Option value     1,926,000 119,000                      
Market value     $ 2,761,000 $ 152,000                      
Weighted average exercise price of the options (in dollars per share)     $ 23.93 $ 23.33