CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash Flows from Operating Activities:
Net income	$ 76,857	$ 49,994
Loss from discontinued operations		91
Adjustments to reconcile net income to net cash provided by (used in) operating activities -
Depreciation	31,880	29,026
Amortization of intangible assets	5,301	9,165
Amortization of debt issuance costs	218	223
Amortization of deferred revenues	(2,505)	(2,586)
(Gain) loss on sale of property and equipment	(282)	137
Foreign currency (gain) loss	502	(273)
Provision for doubtful accounts	1,508	1,736
Deferred income tax provision (benefit)	(1,122)	4,988
Non-cash stock-based compensation	8,036	5,889
Tax impact of stock-based equity awards		(2,910)
Changes in operating assets and liabilities, net of non-cash transactions - (Increase) decrease in -
Accounts and notes receivable	30,843	(38,591)
Costs and estimated earnings in excess of billings on uncompleted contracts	(65,030)	(103,391)
Inventories	497	3,202
Prepaid expenses and other current assets	13,548	6,868
Increase (decrease) in -
Accounts payable and accrued expenses and other non-current liabilities	(47,634)	(45,535)
Billings in excess of costs and estimated earnings on uncompleted contracts	(10,504)	10,929
Other, net	2,019	(2,443)
Net cash provided by (used in) operating activities of continuing operations	44,132	(73,481)
Cash Flows from Investing Activities:
Proceeds from sale of property and equipment	1,544	613
Additions of property and equipment	(57,637)	(31,868)
Cash paid for acquisitions, net of cash acquired	(977)	(41,904)
Investments in unconsolidated affiliates	(8,545)	(4,906)
Net cash used in investing activities of continuing operations	(65,615)	(78,065)
Cash Flows from Financing Activities:
Distributions to noncontrolling interests	(5,454)	(2,490)
Tax impact of stock-based equity awards		2,910
Exercise of stock options	497	479
Net cash provided by (used in) financing activities of continuing operations	(4,957)	899
Discontinued operations:
Net cash provided by operating activities		13,263
Net cash used in investing activities		(2,890)
Net cash provided by discontinued operations		10,373
Effect of foreign exchange rate changes on cash and cash equivalents	(1,642)	2,292
Net decrease in cash and cash equivalents	(28,082)	(137,982)
Cash and cash equivalents, beginning of period	394,701	315,349
Cash and cash equivalents, end of period	366,619	177,367
Cash (paid) received during the period for -
Interest paid	(462)	(356)
Income taxes paid	(91,581)	(47,594)
Income tax refunds	$ 6	$ 1,305