Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Operating Activities:
Net income	$ 54,593	$ 63,899	$ 95,143	$ 102,663
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Stock-based compensation expense			8,383	6,075
Depreciation and amortization			9,941	9,952
Inventory impairments	0	200	610	750
Net gain on marketable equity securities	(2,327)	(1,278)	(7,167)	(125)
Amortization of discount / premiums on marketable debt securities, net			0	(366)
Deferred income tax expense			7,759	3,557
Net changes in assets and liabilities:
Trade and other receivables			(36)	(2,317)
Mortgage loans held-for-sale, net			39,874	30,929
Prepaid and other assets			(4,206)	(5,108)
Accounts payable and accrued liabilities			(546)	15,835
Net cash provided by (used in) operating activities			55,665	(56,188)
Investing Activities:
Purchases of marketable securities			(5,116)	(14,659)
Maturities of marketable securities			0	50,000
Sales of marketable securities			5,057	12,460
Purchases of property and equipment			(13,860)	(13,051)
Net cash provided by (used in) investing activities			(13,919)	34,750
Financing Activities:
Payments on mortgage repurchase facility, net			(33,776)	(31,521)
Dividend payments			(35,636)	(33,793)
Proceeds from exercise of stock options			17,328	5,835
Net cash used in financing activities			(52,084)	(59,479)
Net decrease in cash, cash equivalents and restricted cash			(10,338)	(80,917)
Cash, cash equivalents and restricted cash:
Beginning of period			470,139	514,240
End of period	459,801	433,323	459,801	433,323
Reconciliation of cash, cash equivalents and restricted cash:
Cash and cash equivalents	459,801	433,323	459,801	433,323
End of period	459,801	433,323	459,801	433,323
Homebuilding Segment [Member]
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Inventory impairments	(0)	200	610	750
Reconciliation of cash, cash equivalents and restricted cash:
Cash and cash equivalents	390,061	378,219	390,061	378,219
Restricted cash	12,911	7,443	12,911	7,443
Financial Services Segment [Member]
Reconciliation of cash, cash equivalents and restricted cash:
Cash and cash equivalents	$ 56,829	$ 47,661	56,829	47,661
Housing Completed or Under Construction [Member]
Net changes in assets and liabilities:
Housing completed or under construction and land under development			(118,528)	(133,576)
Land and Land Under Development [Member]
Net changes in assets and liabilities:
Housing completed or under construction and land under development			$ 24,438	$ (84,457)