Condensed Consolidated Statements of Cash Flows (USD $)	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Cash flows from operating activities:
Net earnings	$ 51,663,000	$ 333,633,000
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	31,121,000	30,663,000
Amortization of debt issuance costs	1,181,000	1,607,000
Provision for losses on accounts receivable	1,589,000	2,695,000
Loss on extinguishment of debt	5,748,000	3,429,000
Loss on derivatives, net	2,345,000	10,106,000
Loss on sale of property, plant and equipment	36,000	58,000
Earnings on equity investments	(2,256,000)	(1,897,000)
Stock-based compensation expense	4,367,000	13,782,000
Deferred income taxes	2,159,000	7,976,000
Changes in assets and liabilities:
Accounts receivable, net	46,940,000	13,345,000
Inventories	2,768,000	7,198,000
Prepaid expenses and other	2,874,000	2,608,000
Other assets	1,140,000	(34,000)
Other non-current liabilities	(1,829,000)	7,228,000
Accounts payable	(9,409,000)	(35,050,000)
Progress billings	(8,386,000)	(7,395,000)
Accrued expenses	(41,018,000)	43,954,000
Total adjustments	39,370,000	100,273,000
Net cash provided by operating activities	91,033,000	433,906,000
Cash flows from investing activities:
Additions to property, plant and equipment	(11,626,000)	(8,401,000)
Proceeds from sale of property, plant and equipment	20,000	36,000
Proceeds from sale of available-for-sale securities	1,494,000
Net cash used in investing activities	(10,112,000)	(8,365,000)
Cash flows from financing activities:
Borrowings of long-term debt	610,000,000
Repayments of long-term debt	(706,169,000)	(301,312,000)
Debt issuance costs	(11,266,000)
Repurchases of common stock	(105,856,000)	(54,623,000)
Proceeds from issuance of common stock	4,672,000	30,433,000
Net cash provided (used in) by financing activities	(208,619,000)	(325,502,000)
Effect of exchange rate changes on cash and cash equivalents	725,000	(1,177,000)
Net increase (decrease) in cash and cash equivalents	(126,973,000)	98,862,000
Cash and cash equivalents at beginning of period	245,935,000	129,846,000
Cash and cash equivalents at end of period	118,962,000	228,708,000
Supplemental disclosure of cash flow information:
Cash paid during the period for interest	17,011,000	45,193,000
Cash paid during the period for income taxes	58,042,000	127,050,000
Non-cash financing activities:
Stock issued under stock-based compensation plans	$ 2,684,000	$ 1,399,000