|**Long-Term Debt LONG-TERM DEBT (Tables)**                               | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
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|**Debt Disclosure [Abstract]**                                           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Schedule of Long-term Debt Instruments [Table Text Block]                | Long-term debt, net of unamortized discounts, premiums, and debt issuance costs totaling $7.9 million and $17.8 million as of December 31, 2021 and December 31, 2020, respectively, consists of the following:December 31,20212020(in thousands)Revolving credit facility due November 2026$—$168,0001.125% Convertible Notes due September 2021—193,0146.125% Senior Notes due September 2024198,674396,3686.25% Senior Notes due December 2025—103,2045.75% Senior Notes due May 2026743,410741,976Total debt, net of unamortized discount, premium and debt issuance costs942,0841,602,562Less: Current portion of long-term debt—193,014Total long-term debt$942,084$1,409,548
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|                                                                         | December 31,                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|                                                                         | 2021                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|                                                                         | (in thousands)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|Revolving credit facility due November 2026                              | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|1.125% Convertible Notes due September 2021                              | —                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|6.125% Senior Notes due September 2024                                   | 198,674                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|6.25% Senior Notes due December 2025                                     | —                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|5.75% Senior Notes due May 2026                                          | 743,410                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|Total debt, net of unamortized discount, premium and debt issuance costs | 942,084                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|Less: Current portion of long-term debt                                  | —                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|Total long-term debt                                                     | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  

X- ReferencesNo definition available.
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duration X- DefinitionTabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.
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