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Shareholders' Equity Transactions (Narrative) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Restricted Stock
Sep. 30, 2014
Stock Options
Sep. 30, 2014
Performance Shares
May 16, 2013
2013 Plan
Sep. 30, 2014
Weighted Average
Restricted Stock
Sep. 30, 2014
Weighted Average
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares authorized               4,460,337    
Unrecognized compensation cost           $ 11,093        
Unrecognized compensation cost for stock options           3,546        
Unrecognized compensation cost for awards other than options         5,491   2,056      
Granted (in shares)     8,977              
Expiration period           10 years        
Stock-based compensation expense recognized as part of selling, general and administrative expense $ 1,934 $ 2,148 $ 4,404 $ 4,721 $ 1,257 $ 2,724 $ 423      
Period for recognition of unrecognized compensation costs     2 years           1 year 6 months 3 years 0 months
Net award activity (in shares)         462,352   341,332      
Awards forfeited in period (in shares)         89,616          
Award vesting period         3 years 4 years        
Outstanding shares not vested (in shares)         502,157          
Grants in period (in shares)         231,176   152,800      
Vested in period (in shares)         27,925          
Weighted average grant date fair value (in dollars per share)         $ 19.14   $ 20.05      
Award requisite service period             3 years      
Awards cancelled (in shares)             29,156      
Performance achievement level, lower range             0.00%      
Performance achievement level, upper range             150.00%      
Performance achievement level, target range             100.00%