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Note 12 - Condensed Consolidating Financial Information - Condensed Consolidating Statements of Cash Flows (Details) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities
Net cash from operating activities		$ 264,312	$ 217,991
Cash flows from investing activities
Capital expenditures		(126,154)	(63,245)
Cash paid for acquisitions, net of cash received		(5,535)	(100,713)
Net activity with affiliates		0	0
Other investing activities		(23,259)	(9,240)
Net cash from investing activities		(154,948)	(173,198)
Cash flows from financing activities
Borrowings under bank credit facility		776,029	333,900
Payments under bank credit facility		(851,076)	(591,476)
Debt financing costs, net		(60)	(11,028)
Net activity with affiliates		0	0
Share-based compensation activities, net		(3,056)	(3,381)
Shares repurchased and retired		(27,761)	(30,332)
Dividends paid		(13,389)	(11,267)
Other financing activities		(176)	(50)
Net cash from financing activities		(119,489)	386,366
Net change in cash, cash equivalents and restricted cash		(10,125)	431,641
Cash, cash equivalents and restricted cash, beginning of period		273,202	227,279
Cash, cash equivalents and restricted cash, end of period		263,077	658,920
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
Net change in cash, cash equivalents and restricted cash		(10,125)	431,641
Cash, cash equivalents and restricted cash, beginning of period		273,202	227,279
Cash, cash equivalents and restricted cash, end of period		263,077	658,920
Consolidation, Eliminations [Member]
Cash flows from operating activities
Net cash from operating activities		(179)	(121)
Cash flows from investing activities
Capital expenditures		0	0
Cash paid for acquisitions, net of cash received		0	0
Net activity with affiliates		328,566	289,708
Other investing activities		0	0
Net cash from investing activities		328,566	289,708
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		(328,387)	(289,587)
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		(328,387)	(289,587)
Net 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
Net 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		(110,388)	(70,065)
Cash flows from investing activities
Capital expenditures		(81,645)	(36,914)
Cash paid for acquisitions, net of cash received		(5,535)	(100,713)
Net activity with affiliates		0	0
Other investing activities		(16,471)	(9,240)
Net cash from investing activities		(103,651)	(146,867)
Cash flows from financing activities
Borrowings under bank credit facility		776,029	333,900
Payments under bank credit facility		(851,076)	(591,476)
Debt financing costs, net		(60)	(11,028)
Net activity with affiliates		326,679	277,000
Share-based compensation activities, net		(3,056)	(3,381)
Shares repurchased and retired		(27,761)	(30,332)
Dividends paid		(13,389)	(11,267)
Other financing activities		0	0
Net cash from financing activities		207,366	663,416
Net change in cash, cash equivalents and restricted cash		(6,673)	446,484
Cash, cash equivalents and restricted cash, beginning of period		8,697	347
Cash, cash equivalents and restricted cash, end of period		2,024	446,831
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
Net change in cash, cash equivalents and restricted cash		(6,673)	446,484
Cash, cash equivalents and restricted cash, beginning of period		8,697	347
Cash, cash equivalents and restricted cash, end of period		2,024	446,831
Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]
Cash flows from operating activities
Net cash from operating activities		375,562	282,907
Cash flows from investing activities
Capital expenditures		(43,223)	(26,059)
Cash paid for acquisitions, net of cash received		0	0
Net activity with affiliates		(328,558)	(289,361)
Other investing activities		(6,788)	0
Net cash from investing activities		(378,569)	(315,420)
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		(176)	(50)
Net cash from financing activities		(176)	(50)
Net change in cash, cash equivalents and restricted cash		(3,183)	(32,563)
Cash, cash equivalents and restricted cash, beginning of period		239,903	213,963
Cash, cash equivalents and restricted cash, end of period		236,720	181,400
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
Net change in cash, cash equivalents and restricted cash		(3,183)	(32,563)
Cash, cash equivalents and restricted cash, beginning of period		239,903	213,963
Cash, cash equivalents and restricted cash, end of period		236,720	181,400
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
Net 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
Net 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		(691)	5,405
Cash flows from investing activities
Capital expenditures		(1,286)	(272)
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		(1,286)	(272)
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		1,708	12,587
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		1,708	12,587
Net change in cash, cash equivalents and restricted cash		(269)	17,720
Cash, cash equivalents and restricted cash, beginning of period		24,602	12,969
Cash, cash equivalents and restricted cash, end of period		24,333	30,689
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
Net change in cash, cash equivalents and restricted cash		(269)	17,720
Cash, cash equivalents and restricted cash, beginning of period		24,602	12,969
Cash, cash equivalents and restricted cash, end of period		24,333	30,689
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
Net 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
Net 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 inflow (outflow) from financing activities classified as other.

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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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