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Fair Value Measurements Long-term Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
6.50% Senior Notes Due 2021 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument, Face Amount [1] $ 344,611  
6.125% Senior Notes Due 2022 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument, Face Amount 561,796  
6.50% Senior Notes Due 2023 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument, Face Amount 394,985  
5% Senior Notes Due 2024 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument, Face Amount 500,000  
5.625% Senior Notes Due 2025 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument, Face Amount 500,000  
6.75% Senior Notes Due 2026 [Domain]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument, Face Amount $ 500,000  
Senior Notes [Member] | 6.50% Senior Notes Due 2021 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 6.50%  
Debt Instrument, Face Amount $ 344,611 $ 346,955
Long-term Debt, Fair Value $ 338,794 354,546
Senior Notes [Member] | 6.125% Senior Notes Due 2022 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 6.125%  
Debt Instrument, Face Amount $ 561,796 561,796
Long-term Debt, Fair Value $ 536,347 570,925
Senior Notes [Member] | 6.50% Senior Notes Due 2023 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 6.50%  
Debt Instrument, Face Amount $ 394,985 394,985
Long-term Debt, Fair Value $ 377,211 403,134
Senior Notes [Member] | 5% Senior Notes Due 2024 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 5.00%  
Debt Instrument, Face Amount $ 500,000 500,000
Long-term Debt, Fair Value $ 445,465 475,975
Senior Notes [Member] | 5.625% Senior Notes Due 2025 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 5.625%  
Debt Instrument, Face Amount $ 500,000 500,000
Long-term Debt, Fair Value $ 449,335 485,000
Senior Notes [Member] | 6.75% Senior Notes Due 2026 [Domain]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 6.75%  
Debt Instrument, Face Amount $ 500,000 500,000
Long-term Debt, Fair Value $ 479,840 516,565
Convertible Debt [Member] | 1.50% Senior Convertible Notes Due 2021 [Domain]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 1.50%  
Debt Instrument, Face Amount $ 172,500 172,500
Long-term Debt, Fair Value $ 154,612 $ 202,189
[1] During the first quarter of 2017, the Company repurchased a total of $2.3 million in aggregate principal amount of 6.50% Senior Notes due 2021 in open market transactions at a slight premium. The Company canceled all of these repurchased Senior Notes upon cash settlement.