CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Operating Activities
Net loss	$ (16,661)	$ (4,200)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation, depletion and amortization	33,988	29,573
Non-cash restructuring, net	(497)	(1,888)
Other non-cash impairment charges	0	2,752
Gain on sales of property and equipment	(4,394)	(4,871)
Stock-based compensation	8,101	6,492
Changes in assets and liabilities, net of the effects of a acquisition:
Receivables	(9,176)	(20,771)
Costs and estimated earnings in excess of billings, net	(24,873)	(47,201)
Inventories	(9,120)	(16,528)
Equity in construction joint ventures	(42,336)	(6,792)
Other assets, net	(5,957)	15,753
Accounts payable	(10,548)	27,632
Accrued expenses and other current liabilities, net	29,825	(14,575)
Net cash used in operating activities	(51,648)	(34,624)
Investing Activities
Purchases of marketable securities	(14,975)	(39,945)
Maturities of marketable securities	43,000	65,100
Proceeds from sale of marketable securities	5,000	35,000
Additions to property and equipment	(19,422)	(19,855)
Proceeds from sales of property and equipment	8,481	6,078
Payments of Kenny post-closing adjustments	(4,621)	0
Other investing activities, net	163	(978)
Net cash provided by investing activities	17,626	45,400
Financing Activities
Long-term debt principal payments	(10,594)	(10,834)
Cash dividends paid	(10,078)	(10,050)
Purchase of common stock	(5,022)	(4,054)
Contributions from Noncontrolling Partners Net	6,001	0
Distributions to Noncontrolling Interests	(21,142)	(5,440)
Other financing activities, net	700	563
Net cash used in financing activities	(40,135)	(29,815)
Decrease in cash and cash equivalents	(74,157)	(19,039)
Cash and cash equivalents at beginning of period	321,990	256,990
Cash and cash equivalents at end of period	247,833	237,951
Cash paid during the period for:
Interest	7,339	7,158
Income taxes	2,006	771
Non-cash investing and financing activities:
Restricted stock units issued, net of forfeitures	14,862	11,417
Accrued cash dividends	5,051	5,029
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