Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cash flows from operating activities:
Net earnings	$ 48,128	$ 51,663
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	29,097	31,121
Amortization of debt issuance costs	858	1,181
Provision for losses on accounts receivable	883	1,589
Goodwill, Impairment Loss	7,585	0
Loss on extinguishment of debt	0	5,748
(Gain) loss on derivatives, net	(1,049)	2,345
Gain (loss) on sale of property, plant and equipment	405	36
Stock-based compensation expense	4,801	4,367
Deferred income taxes	(826)	(2,159)
Changes in assets and liabilities:
Accounts receivable, net	73,243	46,940
Inventories	10,754	2,768
Prepaid expenses and other	(16,417)	2,874
Other assets	292	(1,116)
Accounts payable	(79,017)	(9,409)
Progress billings	679	8,386
Accrued expenses	9,124	41,018
Other non-current liabilities	783	1,829
Total adjustments	21,675	39,370
Net cash provided by (used in) operating activities	69,803	91,033
Cash flows from investing activities:
Additions to property, plant and equipment	(11,770)	(11,626)
Payments to Acquire Businesses, Net of Cash Acquired	(18,362)	0
Proceeds from sale of property, plant and equipment	217	20
Proceeds from sale of available-for-sale securities	0	1,494
Net cash used in investing activities	(29,915)	(10,112)
Net Cash Provided by (Used in) Financing Activities [Abstract]
Proceeds from Issuance of Debt	0	610,000
Repayments of long-term debt	(7,500)	(706,169)
Debt issuance costs	0	(11,266)
Repurchases of common stock	(65,900)	(105,856)
Proceeds from issuance of common stock	6,305	4,672
Net cash provided (used in) by financing activities	(67,095)	(208,619)
Effect of exchange rate changes on cash and cash equivalents	473	725
Net increase (decrease) in cash and cash equivalents	(26,734)	(126,973)
Cash and cash equivalents at beginning of period	101,971	245,935
Cash and cash equivalents at end of period	75,237	118,962
Supplemental disclosure of cash flow information:
Cash paid during the period for interest	13,675	17,011
Cash paid during the period for income taxes	48,744	58,042
Non-cash financing activities:
Stock issued under stock-based compensation plans	$ 0	$ 2,684