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Note 12 - Condensed Consolidating Financial Information - Condensed Consolidating Statements of Cash Flows (Details) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities
Net cash from operating activities		$ 415,389	$ 332,172
Cash flows from investing activities
Capital expenditures		(166,797)	(107,634)
Cash paid for acquisitions, net of cash received		(5,535)	(367,333)
Net activity with affiliates		0	0
Other investing activities		(23,259)	(10,590)
Net cash from investing activities		(195,591)	(485,557)
Cash flows from financing activities
Borrowings under bank credit facility		1,061,929	413,000
Payments under bank credit facility		(1,240,950)	(633,022)
Debt financing costs, net		(44)	(14,016)
Net activity with affiliates		0	0
Share-based compensation activities, net		(3,067)	(2,837)
Shares repurchased and retired		(28,045)	(44,822)
Dividends paid		(21,169)	(18,009)
Other financing activities		(215)	(111)
Net cash from financing activities		(231,561)	400,183
Change in cash, cash equivalents and restricted cash		(11,763)	247,280
Cash, cash equivalents and restricted cash, beginning of period		273,202	227,279
Cash, cash equivalents and restricted cash, end of period		261,439	474,559
Proceeds from issuance of senior notes		0	700,000
Cash Flows from Discontinued Operations
Cash flows from operating activities		0	0
Cash flows from investing activities		0	482
Cash flows from financing activities		0	0
Net cash provided by discontinued operations		0	482
Change in cash, cash equivalents and restricted cash		(11,763)	247,280
Cash, cash equivalents and restricted cash, beginning of period		273,202	227,279
Cash, cash equivalents and restricted cash, end of period		261,439	474,559
Consolidation, Eliminations [Member]
Cash flows from operating activities
Net cash from operating activities		(670)	333
Cash flows from investing activities
Capital expenditures		0	0
Cash paid for acquisitions, net of cash received		0	0
Net activity with affiliates		507,206	433,613
Other investing activities		0	0
Net cash from investing activities		507,206	433,613
Cash flows from financing activities
Borrowings under bank credit facility		0	0
Payments under bank credit facility		0	0
Debt financing costs, net		0	0
Net activity with affiliates		(506,536)	(433,946)
Share-based compensation activities, net		0	0
Shares repurchased and retired		0	0
Dividends paid		0	0
Other financing activities		0	0
Net cash from financing activities		(506,536)	(433,946)
Change in cash, cash equivalents and restricted cash		0	0
Cash, cash equivalents and restricted cash, beginning of period		0	0
Cash, cash equivalents and restricted cash, end of period		0	0
Proceeds from issuance of senior notes			0
Cash Flows from Discontinued Operations
Cash flows from operating activities			0
Cash flows from investing activities			0
Cash flows from financing activities			0
Net cash provided by discontinued operations			0
Change in cash, cash equivalents and restricted cash		0	0
Cash, cash equivalents and restricted cash, beginning of period		0	0
Cash, cash equivalents and restricted cash, end of period		0	0
Parent Company [Member] | Reportable Legal Entities [Member]
Cash flows from operating activities
Net cash from operating activities		(156,047)	(114,336)
Cash flows from investing activities
Capital expenditures		(101,489)	(67,866)
Cash paid for acquisitions, net of cash received		(5,535)	(367,333)
Net activity with affiliates		0	0
Other investing activities		(16,471)	(9,240)
Net cash from investing activities		(123,495)	(444,439)
Cash flows from financing activities
Borrowings under bank credit facility		1,061,929	413,000
Payments under bank credit facility		(1,240,950)	(633,022)
Debt financing costs, net		(44)	(14,016)
Net activity with affiliates		507,027	415,333
Share-based compensation activities, net		(3,067)	(2,837)
Shares repurchased and retired		(28,045)	(44,822)
Dividends paid		(21,169)	(18,009)
Other financing activities		0	0
Net cash from financing activities		275,681	815,627
Change in cash, cash equivalents and restricted cash		(3,861)	256,852
Cash, cash equivalents and restricted cash, beginning of period		8,697	347
Cash, cash equivalents and restricted cash, end of period		4,836	257,199
Proceeds from issuance of senior notes			700,000
Cash Flows from Discontinued Operations
Cash flows from operating activities			0
Cash flows from investing activities			0
Cash flows from financing activities			0
Net cash provided by discontinued operations			0
Change in cash, cash equivalents and restricted cash		(3,861)	256,852
Cash, cash equivalents and restricted cash, beginning of period		8,697	347
Cash, cash equivalents and restricted cash, end of period		4,836	257,199
Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]
Cash flows from operating activities
Net cash from operating activities		572,769	446,223
Cash flows from investing activities
Capital expenditures		(64,524)	(39,008)
Cash paid for acquisitions, net of cash received		0	0
Net activity with affiliates		(507,198)	(433,266)
Other investing activities		(6,788)	(1,350)
Net cash from investing activities		(578,510)	(473,624)
Cash flows from financing activities
Borrowings under bank credit facility		0	0
Payments under bank credit facility		0	0
Debt financing costs, net		0	0
Net activity with affiliates		0	0
Share-based compensation activities, net		0	0
Shares repurchased and retired		0	0
Dividends paid		0	0
Other financing activities		(215)	(111)
Net cash from financing activities		(215)	(111)
Change in cash, cash equivalents and restricted cash		(5,956)	(27,512)
Cash, cash equivalents and restricted cash, beginning of period		239,903	213,963
Cash, cash equivalents and restricted cash, end of period		233,947	186,451
Proceeds from issuance of senior notes			0
Cash Flows from Discontinued Operations
Cash flows from operating activities			0
Cash flows from investing activities			0
Cash flows from financing activities			0
Net cash provided by discontinued operations			0
Change in cash, cash equivalents and restricted cash		(5,956)	(27,512)
Cash, cash equivalents and restricted cash, beginning of period		239,903	213,963
Cash, cash equivalents and restricted cash, end of period		233,947	186,451
Subsidiaries [Member] | Reportable Legal Entities [Member]
Cash flows from operating activities
Net cash from operating activities	[1]	8	(135)
Cash flows from investing activities
Capital expenditures	[1]	0	0
Cash paid for acquisitions, net of cash received		0	0
Net activity with affiliates	[1]	(8)	(347)
Other investing activities	[1]	0	0
Net cash from investing activities	[1]	(8)	(347)
Cash flows from financing activities
Borrowings under bank credit facility	[1]	0	0
Payments under bank credit facility	[1]	0	0
Debt financing costs, net	[1]	0	0
Net activity with affiliates	[1]	0	0
Share-based compensation activities, net	[1]	0	0
Shares repurchased and retired	[1]	0	0
Dividends paid	[1]	0	0
Other financing activities	[1]	0	0
Net cash from financing activities	[1]	0	0
Change in cash, cash equivalents and restricted cash	[1]	0	0
Cash, cash equivalents and restricted cash, beginning of period	[1]	0	0
Cash, cash equivalents and restricted cash, end of period	[1]	0	0
Proceeds from issuance of senior notes			0
Cash Flows from Discontinued Operations
Cash flows from operating activities			0
Cash flows from investing activities			482
Cash flows from financing activities			0
Net cash provided by discontinued operations			482
Change in cash, cash equivalents and restricted cash	[1]	0	0
Cash, cash equivalents and restricted cash, beginning of period	[1]	0	0
Cash, cash equivalents and restricted cash, end of period	[1]	0	0
Non-Guarantor Subsidiaries, 100% Owned [Member] | Reportable Legal Entities [Member]
Cash flows from operating activities
Net cash from operating activities		(671)	87
Cash flows from investing activities
Capital expenditures		(784)	(760)
Cash paid for acquisitions, net of cash received		0	0
Net activity with affiliates		0	0
Other investing activities		0	0
Net cash from investing activities		(784)	(760)
Cash flows from financing activities
Borrowings under bank credit facility		0	0
Payments under bank credit facility		0	0
Debt financing costs, net		0	0
Net activity with affiliates		(491)	18,613
Share-based compensation activities, net		0	0
Shares repurchased and retired		0	0
Dividends paid		0	0
Other financing activities		0	0
Net cash from financing activities		(491)	18,613
Change in cash, cash equivalents and restricted cash		(1,946)	17,940
Cash, cash equivalents and restricted cash, beginning of period		24,602	12,969
Cash, cash equivalents and restricted cash, end of period		22,656	30,909
Proceeds from issuance of senior notes			0
Cash Flows from Discontinued Operations
Cash flows from operating activities			0
Cash flows from investing activities			0
Cash flows from financing activities			0
Net cash provided by discontinued operations			0
Change in cash, cash equivalents and restricted cash		(1,946)	17,940
Cash, cash equivalents and restricted cash, beginning of period		24,602	12,969
Cash, cash equivalents and restricted cash, end of period		22,656	30,909
Non-Guarantor Subsidiaries, Not 100% Owned [Member] | Reportable Legal Entities [Member]
Cash flows from operating activities
Net cash from operating activities		0	0
Cash flows from investing activities
Capital expenditures		0	0
Cash paid for acquisitions, net of cash received		0	0
Net activity with affiliates		0	0
Other investing activities		0	0
Net cash from investing activities		0	0
Cash flows from financing activities
Borrowings under bank credit facility		0	0
Payments under bank credit facility		0	0
Debt financing costs, net		0	0
Net activity with affiliates		0	0
Share-based compensation activities, net		0	0
Shares repurchased and retired		0	0
Dividends paid		0	0
Other financing activities		0	0
Net cash from financing activities		0	0
Change in cash, cash equivalents and restricted cash		0	0
Cash, cash equivalents and restricted cash, beginning of period		0	0
Cash, cash equivalents and restricted cash, end of period		0	0
Proceeds from issuance of senior notes			0
Cash Flows from Discontinued Operations
Cash flows from operating activities			0
Cash flows from investing activities			0
Cash flows from financing activities			0
Net cash provided by discontinued operations			0
Change in cash, cash equivalents and restricted cash		0	0
Cash, cash equivalents and restricted cash, beginning of period		0	0
Cash, cash equivalents and restricted cash, end of period		$ 0	$ 0
[1] Subsidiary is a 100% owned guarantor of the 6.375% Notes and 6.875% Notes and is a 100% owned non-guarantor of the 6.000% Notes.

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Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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