CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Operating Activities
Net (loss) income	$ (12,205)	$ 41,546
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation, depletion and amortization	54,788	43,651
Non-cash restructuring, net	(23)	(1,782)
Other non-cash impairment charges	0	3,101
Gain on sales of property and equipment	(7,653)	(6,493)
Stock-based compensation	10,645	8,910
Changes in assets and liabilities, net of the effects of a acquisition:
Receivables	(99,856)	(115,066)
Costs and estimated earnings in excess of billings, net	(1,707)	(11,342)
Inventories	(1,882)	(13,024)
Equity in construction joint ventures, including performance guarantees	(54,672)	3,139
Other assets, net	(5,165)	18,581
Accounts payable	5,578	51,025
Accrued expenses and other current liabilities, net, including performance guarantees	47,637	(2,083)
Net cash (used in) provided by operating activities	(64,515)	20,163
Investing activities
Purchases of marketable securities	(34,957)	(59,936)
Maturities of marketable securities	57,000	70,100
Proceeds from sale of marketable securities	5,000	55,000
Additions to property and equipment	(30,467)	(25,971)
Proceeds from sales of property and equipment	18,431	8,368
Payment of Kenny post-closing adjustments	(8,382)	0
Other investing activities, net	1,088	1,165
Net cash provided by investing activities	7,713	48,726
Financing activities
Long-term debt principal payments	(10,900)	(11,584)
Cash dividends paid	(15,150)	(15,078)
Purchases of common stock	(5,457)	(4,521)
Distributions to noncontrolling partners	6,007	0
Distributions to noncontrolling partners	(28,015)	(8,022)
Distributions to noncontrolling partners	790	648
Net cash used in financing activities	(52,725)	(38,557)
(Decrease) increase in cash and cash equivalents	(109,527)	30,332
Cash and cash equivalents at beginning of period	321,990	256,990
Cash and cash equivalents at end of period	212,463	287,322
Cash paid during the period for:
Interest	7,940	6,948
Income taxes	2,338	1,131
Non-cash investing and financing activities:
Restricted stock units issued, net of forfeitures	13,942	11,532
Accrued cash dividends	5,054	5,032
Debt payments out of escrow from sale of assets	0	1,109
Debt extinguishment from joint venture interest transfer	0	9,115
Debt payment from refinancing	$ 0	$ 1,150