|**Earnings Per Share (Tables)**                                                                                       | 6 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 June 30,Six Months Ended June 30,2017201620172016(in thousands)Weighted-average common shares outstanding - basic65,85946,74265,80444,175Dilutive effect of:Restricted stock94—176—Other equity-based awards66—86—Weighted-average common shares and equivalents outstanding - diluted66,01946,74266,06644,175                                                                                                 
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|                                                                                                                      | Three Months Ended June 30,                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|                                                                                                                      | 2017                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|                                                                                                                      | (in thousands)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Weighted-average common shares outstanding - basic                                                                    | 65,859                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Dilutive effect of:                                                                                                   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Restricted stock                                                                                                      | 94                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|Other equity-based awards                                                                                             | 66                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|Weighted-average common shares and equivalents outstanding - diluted                                                  | 66,019                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|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 June 30,Six Months Ended June 30,2017201620172016(in thousands)Weighted-average common share equivalents excluded from diluted earnings per share due to their anti-dilutive effect:Restricted stock376768119745Convertible notes—358—478Other equity-based awards110310105Total anti-dilutive common share equivalents3771,2291291,328
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|                                                                                                                      | Three Months Ended June 30,                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|                                                                                                                      | 2017                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|                                                                                                                      | (in thousands)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Weighted-average common share equivalents excluded from diluted earnings per share due to their anti-dilutive effect: |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Restricted stock                                                                                                      | 376                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Convertible notes                                                                                                     | —                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|Other equity-based awards                                                                                             | 1                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|Total anti-dilutive common share equivalents                                                                          | 377                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
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