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Share-based Compensation (Narrative) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
6 Months Ended 1 Months Ended 6 Months Ended 1 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2013
Restricted Stock
Jun. 30, 2013
Stock Options
Apr. 30, 2012
Selected Officers and Employees
Restricted Stock
Jun. 30, 2013
Selected Officers and Employees
Restricted Stock
Jun. 30, 2013
Selected Officers and Employees
Restricted Stock
Minimum
Jun. 30, 2013
Selected Officers and Employees
Restricted Stock
Maximum
Jun. 30, 2013
Selected Officers and Employees
Stock Options
Apr. 30, 2012
Directors
Restricted Stock
Jun. 30, 2013
Directors
Restricted Stock
Jun. 30, 2013
Directors
Stock Options
Jul. 31, 2010
Directors
Common Stock
Jun. 30, 2013
Directors
Common Stock
Jun. 30, 2013
Directors
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Estimated forfeiture rate (as a percentage)       4.00%     9.45%   2.00% 5.45%      
Estimated annual forfeiture rate (as a percentage)       0.80%     1.89%   0.40% 1.09%      
Unrecognized compensation costs $ 1,260 $ 5                      
Unrecognized compensation costs, weighted-average period of recognition 3 years 8 months 25 days                        
Award vesting period         1 year 7 years   5 years          
Shares granted     298,746                    
Commitment for future grants in April 2013 for selected non-management employees     81,900                    
Authorized shares to be reserved for issuance in lieu of cash                     1,000,000    
Minimum percentage of compensation allowed in shares                     50.00%    
Shares granted to directors in lieu of fees                       2,562 5,680