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Note 8 - Fair Value Measurements - Long-term Debt (Details) - Fair Value, Nonrecurring [Member] - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Long-term debt	$ 3,379,409	$ 3,949,823
Reported Value Measurement [Member]
Long-term debt	3,334,711	3,897,483
Estimate of Fair Value Measurement [Member]
Long-term debt	3,482,780	4,104,524
Fair Value, Inputs, Level 2 [Member] | Bank Credit Facility [Member] | Line of Credit [Member]
Long-term debt	878,011	896,185
Fair Value, Inputs, Level 2 [Member] | Bank Credit Facility [Member] | Line of Credit [Member] | Reported Value Measurement [Member]
Long-term debt	868,294	882,789
Fair Value, Inputs, Level 2 [Member] | Bank Credit Facility [Member] | Line of Credit [Member] | Estimate of Fair Value Measurement [Member]
Long-term debt	876,757	888,511
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, Inputs, Level 1 [Member] | The 4.750% Senior NotesDue December 2027 [Member] | Senior Notes [Member] | Reported Value Measurement [Member]
Long-term debt	987,825	986,364
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	1,030,000	1,038,750
Fair Value, Inputs, Level 1 [Member] | Senior Notes 6.375% Due 2026 [Member] | Senior Notes [Member]
Long-term debt		750,000
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, 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, Inputs, Level 1 [Member] | Senior Note 8.625% Due 2025 [Member] | Senior Notes [Member]
Long-term debt	600,000	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	591,273	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	648,750	667,500
Fair Value, Inputs, Level 1 [Member] | Senior Notes 6.000% Due 2026 [Member] | Senior Notes [Member]
Long-term debt		700,000
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, 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, Inputs, Level 1 [Member] | The 4.750% Senior Notes Due June 2031 [Member] | Senior Notes [Member]
Long-term debt	900,000
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	885,921
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	925,875
Fair Value, Inputs, Level 3 [Member] | Other Long-Term Debt [Member]
Long-term debt	1,398	3,638
Fair Value, Inputs, Level 3 [Member] | Other Long-Term Debt [Member] | Reported Value Measurement [Member]
Long-term debt	1,398	3,638
Fair Value, Inputs, Level 3 [Member] | Other Long-Term Debt [Member] | Estimate of Fair Value Measurement [Member]
Long-term debt	$ 1,398	$ 3,638

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+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612

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-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611

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