|**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 30,2016201520162015(in thousands)Weighted-average common shares outstanding - basic46,74240,03544,17538,202Weighted-average common shares and equivalents outstanding - diluted46,74240,03544,17538,202                                                                                                                                                                                   
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|                                                                                    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|                                                                                    | Three Months Ended June 30,                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|                                                                                    | 2016                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|                                                                                    | (in thousands)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|                                                                                    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Weighted-average common shares outstanding - basic                                  | 46,742                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Weighted-average common shares and equivalents outstanding - diluted                | 46,742                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
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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 June 30,Six Months Ended June 30,2016201520162015(in thousands)Weighted-average common share equivalents excluded from diluted earningsper share due to their anti-dilutive effect:Restricted stock768871745832Convertible notes358677478523Other equity-based awards10311810599Total anti-dilutive common share equivalents1,2291,6661,3281,454
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|                                                                                    | Three Months Ended June 30,                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|                                                                                    | 2016                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|                                                                                    | (in thousands)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|                                                                                    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Weighted-average common share equivalents excluded from diluted earnings            |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|per share due to their anti-dilutive effect:                                        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Restricted stock                                                                    | 768                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|Convertible notes                                                                   | 358                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|Other equity-based awards                                                           | 103                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|Total anti-dilutive common share equivalents                                        | 1,229                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
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