Note 21 - Supplemental Guarantor Information - Supplemental Condensed Combining Statement of Cash Flows (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Net cash provided by (used in) operating activities	$ 69,164	$ (8,903)
Net cash provided by (used in) investing activities	108,047	24,736
Financing Activities:
Payments from (advances to) subsidiaries
Mortgage repurchase facility	(49,382)	3,400
Dividend payments	(38,793)	(36,763)
Payments of deferred financing costs	(2,630)
Proceeds from exercise of stock options	8,503
Net cash provided by (used in) financing activities	(82,302)	(33,363)
Net increase in cash and cash equivalents	94,909	(17,530)
Cash and cash equivalents:
Beginning of period	282,909	180,988
End of period	377,818	163,458
Net cash provided by (used in) operating activities	69,164	(8,903)
Net cash provided by (used in) investing activities	108,047	24,736
Reportable Legal Entities [Member] | Parent Company [Member]
Net cash provided by (used in) operating activities	26,918	(5,918)
Net cash provided by (used in) investing activities	97,540	26,166
Financing Activities:
Payments from (advances to) subsidiaries
Mortgage repurchase facility
Dividend payments	(38,793)	(36,763)
Payments of deferred financing costs	(2,630)
Proceeds from exercise of stock options	8,503
Net cash provided by (used in) financing activities	(32,920)	(36,763)
Net increase in cash and cash equivalents	91,538	(16,515)
Cash and cash equivalents:
Beginning of period	255,679	141,245
End of period	347,217	124,730
Net cash provided by (used in) operating activities	26,918	(5,918)
Net cash provided by (used in) investing activities	97,540	26,166
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]
Net cash provided by (used in) operating activities	(21,023)	(17,581)
Net cash provided by (used in) investing activities	(198)	(1,252)
Financing Activities:
Payments from (advances to) subsidiaries	21,995	20,284
Mortgage repurchase facility
Dividend payments
Payments of deferred financing costs
Proceeds from exercise of stock options
Net cash provided by (used in) financing activities	21,995	20,284
Net increase in cash and cash equivalents	774	1,451
Cash and cash equivalents:
Beginning of period	3,408	3,097
End of period	4,182	4,548
Net cash provided by (used in) operating activities	(21,023)	(17,581)
Net cash provided by (used in) investing activities	(198)	(1,252)
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]
Net cash provided by (used in) operating activities	63,269	14,596
Net cash provided by (used in) investing activities	(254)	(9,797)
Financing Activities:
Payments from (advances to) subsidiaries	(11,036)	(10,665)
Mortgage repurchase facility	(49,382)	3,400
Dividend payments
Payments of deferred financing costs
Proceeds from exercise of stock options
Net cash provided by (used in) financing activities	(60,418)	(7,265)
Net increase in cash and cash equivalents	2,597	(2,466)
Cash and cash equivalents:
Beginning of period	23,822	36,646
End of period	26,419	34,180
Net cash provided by (used in) operating activities	63,269	14,596
Net cash provided by (used in) investing activities	(254)	(9,797)
Consolidation, Eliminations [Member]
Net cash provided by (used in) operating activities
Net cash provided by (used in) investing activities	10,959	9,619
Financing Activities:
Payments from (advances to) subsidiaries	(10,959)	(9,619)
Mortgage repurchase facility
Dividend payments
Payments of deferred financing costs
Proceeds from exercise of stock options
Net cash provided by (used in) financing activities	(10,959)	(9,619)
Net increase in cash and cash equivalents
Cash and cash equivalents:
Beginning of period
End of period
Net cash provided by (used in) operating activities
Net cash provided by (used in) investing activities	$ 10,959	$ 9,619