Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash flows from operating activities:
Net earnings	$ 113,430	$ 385,405	$ 66,768
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	60,708	61,446	67,848
Amortization of debt issuance costs	3,028	2,353	3,281
Provision for losses on accounts receivable	4,024	10,138	5,732
Loss (gain) on debt extinguishment, net	5,748	3,429	(10,028)
Loss on derivatives, net	6,326	18,816	2,513
Loss (gain) on sale of property, plant and equipment	72	(47)	(228)
Stock-based compensation expense	12,908	32,125	7,109
Deferred income taxes	(7,951)	(3,520)	(10,965)
Intangible asset impairment	7,134
Changes in operating assets and liabilities:
Accounts receivable, net	7,608	(41,254)	45,181
Inventories	867	(1,515)	7,701
Prepaid expenses and other	(221)	4,297	(5,810)
Other assets	(532)	(1,259)	2,799
Accounts payable	4,776	(8,817)	1,059
Progress billings	(13,026)	12,469	(4,007)
Accrued expenses	(7,194)	(18,262)	7,889
Other non-current liabilities	2,536	7,522	10,571
Total adjustments	86,811	77,921	130,645
Net cash provided by operating activities	200,241	463,326	197,413
Cash flows from investing activities:
Additions to property, plant and equipment	(21,720)	(26,678)	(19,104)
Additions to intangible assets		(7,582)
Proceeds from sales of property, plant and equipment	200	99	96
Proceeds from sales of available-for-sale securities	1,494	465
Net cash used in investing activities	(20,026)	(33,696)	(19,008)
Cash flows from financing activities:
Borrowings of long-term debt	610,000		20,000
Repayments of long-term debt	(713,667)	(304,845)	(200,134)
Debt issuance costs	(11,695)		(1,335)
Repurchases of common stock	(215,071)	(58,225)
Proceeds from issuance of common stock	6,814	49,461	4,520
Net cash used in financing activities	(323,619)	(313,609)	(176,949)
Effect of exchange rate changes on cash and cash equivalents	(560)	68	1,834
Net (decrease) increase in cash and cash equivalents	(143,964)	116,089	3,290
Cash and cash equivalents at beginning of the year	245,935	129,846	126,556
Cash and cash equivalents at end of the year	101,971	245,935	129,846
Supplemental disclosure of cash flow information:
Cash paid during the year for interest	31,349	72,394	79,501
Cash paid during the year for income taxes	81,539	237,674	43,518
Non-cash financing activities:
Stock issued under stock-based compensation plan	$ 3,385	$ 7,634	$ 68