|**Earnings Per Share (Tables)**                                                     | 9 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
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|**Earnings Per Share [Abstract]**                                                   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|Schedule of Earnings Per Share Reconciliation                                       | The following table presents a reconciliation of the weighted-average diluted shares outstanding:Three Months Ended September 30,Nine Months Ended September 30,2013201220132012(in thousands)Weighted-average common shares outstanding - basic33,41330,21431,35026,819Weighted-average common shares and equivalents outstanding - diluted33,41330,21431,35026,819                                                                                                                                                                                                                            
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|                                                                                    | Three Months Ended September 30,                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|                                                                                    | 2013                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|                                                                                    | (in thousands)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
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|Weighted-average common shares outstanding - basic                                  | 33,413                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Weighted-average common shares and equivalents outstanding - diluted                | 33,413                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
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|Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share | The following table presents 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 30,2013201220132012(in thousands)Weighted-average common share equivalents excluded from diluted earningsper share due to their anti-dilutive effect:Restricted stock805777857688SARs8311965115Stock options7777Non-employee director deferred compensation4343Convertible senior notes671—387—Total anti-dilutive common share equivalents1,5709061,320813
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|                                                                                    | Three Months Ended September 30,                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|                                                                                    | 2013                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|                                                                                    | (in thousands)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
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|Weighted-average common share equivalents excluded from diluted earnings            |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|per share due to their anti-dilutive effect:                                        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|Restricted stock                                                                    | 805                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|SARs                                                                                | 83                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|Stock options                                                                       | 7                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|Non-employee director deferred compensation                                         | 4                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|Convertible senior notes                                                            | 671                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Total anti-dilutive common share equivalents                                        | 1,570                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
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