|**Earnings Per Share (Tables)**                                                                        | 9 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
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|**Earnings Per Share [Abstract]**                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Schedule of Weighted Average Number of Shares [Table Text Block]                                       | The following is a reconciliation of weighted-average diluted shares outstanding:Three Months Ended September 30,Nine Months Ended September 30,2012201120122011(in thousands)Weighted-average common shares outstanding - basic30,21423,56926,81923,497Dilutive effect of share-based compensation:Restricted stock—162—167SARs—49—45Non-employee director deferred compensation—3—3Weighted-average common and common share equivalents outstanding - diluted30,21423,78326,81923,712                                                                        
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|                                                                                                       | Three Months Ended September 30,                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|                                                                                                       | 2012                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|                                                                                                       | (in thousands)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|                                                                                                       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Weighted-average common shares outstanding - basic                                                     | 30,214                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|Dilutive effect of share-based compensation:                                                           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Restricted stock                                                                                       | —                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|SARs                                                                                                   | —                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|Non-employee director deferred compensation                                                            | —                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|Weighted-average common and common share equivalents outstanding - diluted                             | 30,214                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
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|Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] | The following table sets forth the weighted-average common share equivalents excluded from the calculation of diluted earnings per share due to their anti-dilutive effect:Three Months Ended September 30,Nine Months Ended September 30,2012201120122011(in thousands)Weighted-average common share equivalents excluded from diluted earningsper share due to their anti-dilutive effect:Restricted stock777198688173Stock options79710SARs1192911523Non-employee director deferred compensation3—3—Total anti-dilutive common share equivalents906236813206
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|                                                                                                       | Three Months Ended September 30,                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|                                                                                                       | 2012                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|                                                                                                       | (in thousands)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|Weighted-average common share equivalents excluded from diluted earnings                               |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|per share due to their anti-dilutive effect:                                                           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Restricted stock                                                                                       | 777                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|Stock options                                                                                          | 7                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|SARs                                                                                                   | 119                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|Non-employee director deferred compensation                                                            | 3                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|Total anti-dilutive common share equivalents                                                           | 906                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
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