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Note 10 - Fair Value Measurements - Long-Term Debt (Details) - Fair Value, Nonrecurring [Member] - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Long-term debt	$ 3,954,787	$ 4,030,035
Reported Value Measurement [Member]
Long-term debt	3,909,206	3,979,300
Estimate of Fair Value Measurement [Member]
Long-term debt	4,047,589	3,918,672
Fair Value, Inputs, Level 2 [Member] | Bank Credit Facility [Member] | Line of Credit [Member]
Long-term debt	1,696,282	1,771,330
Fair Value, Inputs, Level 2 [Member] | Bank Credit Facility [Member] | Line of Credit [Member] | Reported Value Measurement [Member]
Long-term debt	1,676,398	1,748,529
Fair Value, Inputs, Level 2 [Member] | Bank Credit Facility [Member] | Line of Credit [Member] | Estimate of Fair Value Measurement [Member]
Long-term debt	1,685,646	1,720,654
Fair Value, Inputs, Level 1 [Member] | Senior Notes 6.875% Due 2023 [Member] | Senior Notes [Member]
Long-term debt	750,000	750,000
Fair Value, Inputs, Level 1 [Member] | Senior Notes 6.875% Due 2023 [Member] | Senior Notes [Member] | Reported Value Measurement [Member]
Long-term debt	743,177	742,299
Fair Value, Inputs, Level 1 [Member] | Senior Notes 6.875% Due 2023 [Member] | Senior Notes [Member] | Estimate of Fair Value Measurement [Member]
Long-term debt	776,250	757,500
Fair Value, Inputs, Level 1 [Member] | Senior Notes 6.375% Due 2026 [Member] | Senior Notes [Member]
Long-term debt	750,000	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	741,068	740,406
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	792,188	724,688
Fair Value, Inputs, Level 1 [Member] | Senior Notes 6.000% Due 2026 [Member] | Senior Notes [Member]
Long-term debt	700,000	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	690,058	689,361
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	735,000	657,125
Fair Value, Inputs, Level 3 [Member] | Other Long-Term Debt [Member]
Long-term debt	58,505	58,705
Fair Value, Inputs, Level 3 [Member] | Other Long-Term Debt [Member] | Reported Value Measurement [Member]
Long-term debt	58,505	58,705
Fair Value, Inputs, Level 3 [Member] | Other Long-Term Debt [Member] | Estimate of Fair Value Measurement [Member]
Long-term debt	$ 58,505	$ 58,705

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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611

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