Note 20 - Supplemental Guarantor Information - Supplemental Condensed Combining Statements of Cash Flows (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Payments from (advances to) subsidiaries
Mortgage repurchase facility	(45,358)	4,686
Dividend payments	(25,809)	(24,504)
Proceeds from exercise of stock options	7,304
Net cash provided by (used in) financing activities	(63,863)	(19,818)
Net increase in cash and cash equivalents	55,067	(9,682)
Cash and cash equivalents:
Beginning of period	282,909	180,988
Net cash provided by (used in) operating activities	120,887	(22,086)
Net cash provided by (used in) investing activities	(1,957)	32,222
Financing Activities:
End of period	337,976	171,306
Reportable Legal Entities [Member] | Parent Company [Member]
Payments from (advances to) subsidiaries
Mortgage repurchase facility
Dividend payments	(25,809)	(24,504)
Proceeds from exercise of stock options	7,304
Net cash provided by (used in) financing activities	(18,505)	(24,504)
Net increase in cash and cash equivalents	54,650	(13,272)
Cash and cash equivalents:
Beginning of period	255,679	141,245
Net cash provided by (used in) operating activities	32,086	17,988
Net cash provided by (used in) investing activities	41,069	(6,756)
Financing Activities:
End of period	310,329	127,973
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]
Payments from (advances to) subsidiaries	(33,340)	47,816
Mortgage repurchase facility
Dividend payments
Proceeds from exercise of stock options
Net cash provided by (used in) financing activities	(33,340)	47,816
Net increase in cash and cash equivalents	1,077	936
Cash and cash equivalents:
Beginning of period	3,408	3,097
Net cash provided by (used in) operating activities	34,505	(45,748)
Net cash provided by (used in) investing activities	(88)	(1,132)
Financing Activities:
End of period	4,485	4,033
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]
Payments from (advances to) subsidiaries	(9,539)	(4,739)
Mortgage repurchase facility	(45,358)	4,686
Dividend payments
Proceeds from exercise of stock options
Net cash provided by (used in) financing activities	(54,897)	(53)
Net increase in cash and cash equivalents	(660)	2,654
Cash and cash equivalents:
Beginning of period	23,822	36,646
Net cash provided by (used in) operating activities	54,296	5,674
Net cash provided by (used in) investing activities	(59)	(2,967)
Financing Activities:
End of period	23,162	39,300
Consolidation, Eliminations [Member]
Payments from (advances to) subsidiaries	42,879	(43,077)
Mortgage repurchase facility
Dividend payments
Proceeds from exercise of stock options
Net cash provided by (used in) financing activities	42,879	(43,077)
Net increase in cash and cash equivalents
Cash and cash equivalents:
Beginning of period
Net cash provided by (used in) operating activities
Net cash provided by (used in) investing activities	(42,879)	43,077
Financing Activities:
End of period