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Note 8 - Fair Value Measurements - Long-term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Fair Value, Inputs, Level 1 [Member] | Senior Note 8.625% Due 2025 [Member] | Senior Notes [Member]
Long-term debt		$ 600,000
Fair Value, Inputs, Level 1 [Member] | Senior Note 8.625% Due 2025 [Member] | Senior Notes [Member] | Reported Value Measurement [Member]
Long-term debt		589,488
Fair Value, Inputs, Level 1 [Member] | Senior Note 8.625% Due 2025 [Member] | Senior Notes [Member] | Estimate of Fair Value Measurement [Member]
Long-term debt		667,500
Fair Value, Nonrecurring [Member]
Long-term debt	$ 3,386,943	3,949,823
Fair Value, Nonrecurring [Member] | Reported Value Measurement [Member]
Long-term debt	3,339,550	3,897,483
Fair Value, Nonrecurring [Member] | Estimate of Fair Value Measurement [Member]
Long-term debt	3,511,731	4,104,524
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | Bank Credit Facility [Member] | Line of Credit [Member]
Long-term debt	884,648	896,185
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | Bank Credit Facility [Member] | Line of Credit [Member] | Reported Value Measurement [Member]
Long-term debt	873,679	882,789
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | Bank Credit Facility [Member] | Line of Credit [Member] | Estimate of Fair Value Measurement [Member]
Long-term debt	882,436	888,511
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] | The 4.750% Senior NotesDue December 2027 [Member] | Senior Notes [Member]
Long-term debt	1,000,000	1,000,000
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] | The 4.750% Senior NotesDue December 2027 [Member] | Senior Notes [Member] | Reported Value Measurement [Member]
Long-term debt	987,338	986,364
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] | The 4.750% Senior NotesDue December 2027 [Member] | Senior Notes [Member] | Estimate of Fair Value Measurement [Member]
Long-term debt	1,032,500	1,038,750
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] | Senior Notes 6.375% Due 2026 [Member] | Senior Notes [Member]
Long-term debt		750,000
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] | Senior Notes 6.375% Due 2026 [Member] | Senior Notes [Member] | Reported Value Measurement [Member]
Long-term debt		743,053
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] | Senior Notes 6.375% Due 2026 [Member] | Senior Notes [Member] | Estimate of Fair Value Measurement [Member]
Long-term debt		778,125
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] | Senior Note 8.625% Due 2025 [Member] | Senior Notes [Member]
Long-term debt	600,000
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] | Senior Note 8.625% Due 2025 [Member] | Senior Notes [Member] | Reported Value Measurement [Member]
Long-term debt	590,678
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] | Senior Note 8.625% Due 2025 [Member] | Senior Notes [Member] | Estimate of Fair Value Measurement [Member]
Long-term debt	660,750
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] | Senior Notes 6.000% Due 2026 [Member] | Senior Notes [Member]
Long-term debt		700,000
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] | Senior Notes 6.000% Due 2026 [Member] | Senior Notes [Member] | Reported Value Measurement [Member]
Long-term debt		692,151
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] | Senior Notes 6.000% Due 2026 [Member] | Senior Notes [Member] | Estimate of Fair Value Measurement [Member]
Long-term debt		728,000
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] | The 4.750% Senior Notes Due June 2031 [Member] | Senior Notes [Member]
Long-term debt	900,000
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] | The 4.750% Senior Notes Due June 2031 [Member] | Senior Notes [Member] | Reported Value Measurement [Member]
Long-term debt	885,560
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] | The 4.750% Senior Notes Due June 2031 [Member] | Senior Notes [Member] | Estimate of Fair Value Measurement [Member]
Long-term debt	933,750
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other Long-Term Debt [Member]
Long-term debt	2,295	3,638
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other Long-Term Debt [Member] | Reported Value Measurement [Member]
Long-term debt	2,295	3,638
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other Long-Term Debt [Member] | Estimate of Fair Value Measurement [Member]
Long-term debt	$ 2,295	$ 3,638

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+ References

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-Publisher FASB
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