CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Operating activities
Net income (loss)	$ 66,085	$ (62,448)	$ 100,201
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Restructuring impairment charges	1,678	93,862	1,449
Other impairment charges	5,067	821	4,110
Depreciation, depletion and amortization	60,546	74,435	80,195
Gain on sales of property and equipment	(15,789)	(13,748)	(17,169)
Change in deferred income tax	8,566	(39,289)	21,107
Stock-based compensation	12,155	13,040	10,765
Loss (gain) on company owned life insurance	18	(3,321)	(2,551)
Equity in income of affiliates	(2,193)	(756)	(7,696)
Changes in assets and liabilities, net of the effects of consolidations:
Receivables	(2,258)	39,070	31,302
Costs and estimated earnings in excess of billings, net	(56,524)	(35,756)	(68,647)
Inventories	43	(5,368)	9,423
Real estate held for development and sale	(3,704)	(14,743)	(17,263)
Equity in construction joint ventures	(26,313)	(8,230)	(23,012)
Other assets, net	2,164	10,429	4,656
Accounts payable	28,960	(1,871)	(43,480)
Accrued expenses and other current liabilities, net	13,844	(16,809)	(19,089)
Net cash provided by operating activities	92,345	29,318	64,301
Investing activities
Purchases of marketable securities	(155,122)	(121,626)	(99,011)
Maturities of marketable securities	110,875	74,000	36,970
Proceeds from sale of marketable securities	33,268	15,000	7,966
Purchase of company owned life insurance	(359)	(8,195)	(8,000)
Additions to property and equipment	(45,035)	(37,004)	(87,645)
Proceeds from sales of property and equipment	27,959	21,148	23,020
Purchase of private preferred stock	(50)	(6,400)	0
Contributions to (distributions from) affiliates, net	1,458	(1,658)	(4,969)
Issuance of notes receivable	(3,979)	(1,313)	(11,314)
Collection of notes receivable	1,599	3,126	13,104
Other investing activities, net	1,658	2,487	0
Net cash used in investing activities	(27,728)	(60,435)	(129,879)
Financing activities
Proceeds from long-term debt	2,122	1,918	10,750
Long-term debt principal payments	(16,907)	(19,829)	(18,856)
Cash dividends paid	(20,117)	(20,150)	(20,057)
Purchase of common stock	(4,029)	(3,641)	(3,431)
Contributions from noncontrolling partners	519	7,321	420
Distributions to noncontrolling partners	(21,581)	(21,498)	(26,019)
Other financing activities, net	344	62	884
Net cash used in financing activities	(59,649)	(55,817)	(56,309)
Increase (decrease) in cash and cash equivalents	4,968	(86,934)	(121,887)
Cash and cash equivalents at beginning of year	252,022	338,956	460,843
Cash and cash equivalents at end of year	256,990	252,022	338,956
Cash paid during the period for:
Interest	16,239	15,715	22,783
Income taxes	24,783	3,861	54,082
Non-cash investing and financing activities:
Stock and restricted stock/units issued, net of forfeitures	6,874	9,192	18,457
Accrued cash dividends	5,028	5,038	5,023
Debt payments from sale of assets	$ 14,447	$ 6,064	$ 0