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Stock Incentive Plans (Details 4) (USD $)
12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Restricted stock units
Dec. 31, 2011
Restricted stock units
Dec. 31, 2010
Restricted stock units
Dec. 31, 2012
Restricted stock units
Minimum
Dec. 31, 2012
Restricted stock units
Maximum
Jul. 24, 2012
Restricted stock units
Members of management
Jun. 19, 2012
Restricted stock units
Members of management
May 15, 2012
Restricted stock units
Members of management
Apr. 24, 2012
Restricted stock units
Members of management
Jan. 24, 2012
Restricted stock units
Members of management
Jun. 19, 2012
Restricted stock units
Members of management
Requisite service period of one year
May 15, 2012
Restricted stock units
Members of management
Requisite service period of one year
Apr. 24, 2012
Restricted stock units
Members of management
Requisite service period of one year
Jan. 24, 2012
Restricted stock units
Members of management
Requisite service period of one year
Jun. 19, 2012
Restricted stock units
Members of management
Requisite service period of two years
May 15, 2012
Restricted stock units
Members of management
Requisite service period of two years
Apr. 24, 2012
Restricted stock units
Members of management
Requisite service period of two years
Jan. 24, 2012
Restricted stock units
Members of management
Requisite service period of two years
Jun. 19, 2012
Restricted stock units
Members of management
Requisite service period of three years
May 15, 2012
Restricted stock units
Members of management
Requisite service period of three years
Apr. 24, 2012
Restricted stock units
Members of management
Requisite service period of three years
Jan. 24, 2012
Restricted stock units
Members of management
Requisite service period of three years
Jun. 19, 2012
Restricted stock units
Members of management
Minimum
May 15, 2012
Restricted stock units
Members of management
Minimum
Apr. 24, 2012
Restricted stock units
Members of management
Minimum
Jan. 24, 2012
Restricted stock units
Members of management
Minimum
Jun. 19, 2012
Restricted stock units
Members of management
Maximum
May 15, 2012
Restricted stock units
Members of management
Maximum
Apr. 24, 2012
Restricted stock units
Members of management
Maximum
Jan. 24, 2012
Restricted stock units
Members of management
Maximum
Dec. 31, 2012
DSUs
Jul. 24, 2012
DSUs
Chairman of the Board
Jun. 19, 2012
DSUs
Director
Dec. 31, 2012
DSUs
Director
Dec. 31, 2011
DSUs
Director
Stock Incentive Plans                                                                          
Number of shares of common stock per award     1                                                                 1  
Requisite service period           1 year 5 years 5 years         1 year 1 year 1 year 1 year 2 years 2 years 2 years 2 years 3 years 3 years 3 years 3 years                 1 year 1 year 1 year 1 year  
Shares                                                                          
Non-vested at beginning of year (in shares)     455,352 194,914                                                               22,771  
Granted (in shares)     266,258 250,728 191,579     204,452 2,092 3,275 3,205 53,234                                           5,297 26,600 31,897 22,426
Dividend equivalents earned (in shares)     32,704 9,710 3,335                                                             2,252 345
Vested (in shares)     (9,925)                                                                 (23,929)  
Forfeited (in shares)     (7,977)                                                                 0  
Non-vested at end of year (in shares)     736,412 455,352 194,914               697 1,092 1,068 17,745 697 1,092 1,068 17,745 698 1,091 1,069 17,744                       32,991 22,771
Outstanding at end of year (in shares)                                                                       56,920 22,771
Weighted-Average Grant Date Fair Value                                                                          
Non-vested at beginning of year (in dollars per share)     $ 4.98 $ 4.75                                                               $ 5.23  
Granted (in dollars per share)     $ 4.83 $ 5.16 $ 4.75     $ 4.72                                                       $ 4.77 $ 5.23
Dividend Equivalents Earned (in dollars per share)     $ 4.79 $ 5.20 $ 4.61                                                             $ 4.76 $ 5.22
Vested (in dollars per share)     $ 4.19                                                                 $ 5.21  
Forfeited (in dollars per share)     $ 5.15                                                                    
Non-vested at end of year (in dollars per share)     $ 4.92 $ 4.98 $ 4.75                                                             $ 4.77 $ 5.23
Outstanding at end of year (in dollars per share)                                                                       $ 4.96 $ 5.23
Issuance of treasury shares in conjunction with units vested 6,804   6,804                                                                    
Additional disclosures                                                                          
Stock price (in dollars per share)               $ 4.72 $ 4.78 $ 4.58 $ 4.68 $ 5.26                                           $ 4.72 $ 4.78    
Amount of compensation cost to be recognized $ 2,200,000             $ 965,000 $ 10,000 $ 15,000 $ 15,000 $ 280,011                                           $ 25,000 $ 127,148    
Period over which cost will be recognized 2 years 10 months 24 days                                               1 year 1 year 1 year 1 year 3 years 3 years 3 years 3 years   1 year      
Award to be vested after requisite service period (as a percent)               100.00%                                                   100.00%      
Vesting rights of shares granted (as a percent)                 100.00% 100.00% 100.00% 100.00%                                             100.00%    
Compensation expense recognized $ 1,000,000 $ 400,000                                                                      
Settlement period                                                                       30 days