Statement of Cash Flows (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 184,644,000	$ 145,401,000	$ 114,095,000
Adjustments to reconcile income to net cash provided by operating activities:
Net provision for (recoveries of) doubtful accounts	254,000	1,444,000	545,000
Provision for inventory obsolescence	552,000	643,000	807,000
Equity in earnings of affiliates	(274,000)	(376,000)	(92,000)
Share-based Compensation	17,165,000	8,517,000	5,896,000
Depreciation and amortization	23,303,000	23,113,000	23,818,000
Debt issuance costs amortization and finance charges	5,956,000	15,087,000	14,688,000
(Gain) loss on sale of assets	(487,000)	(176,000)	90,000
Gain on insurance recovery	(1,014,000)	0	0
Loss on exchange of Senior Exchangeable Notes	1,012,000	1,939,000	0
Realization of pension obligation	303,000	137,000	364,000
(Increase) decrease in value of life insurance policies	285,000	(1,950,000)	(1,997,000)
Deferred Income Tax Expense (Benefit)	(6,549,000)	(10,135,000)	25,636,000
Changes in assets and liabilities, net of effects of acquisitions:
Accounts receivable	(12,082,000)	(22,412,000)	9,990,000
Inventories	(16,033,000)	(2,438,000)	1,847,000
Prepaid expenses and other current assets	(1,228,000)	21,455,000	(27,762,000)
Other assets	680,000	(102,000)	(1,060,000)
Accounts payable	11,969,000	11,701,000	(8,579,000)
Accrued expenses	(13,754,000)	13,701,000	18,813,000
Other long-term liabilities	9,424,000	283,000	4,774,000
Net cash provided by operating activities	204,126,000	205,832,000	181,873,000
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(29,927,000)	(27,569,000)	(17,289,000)
Patents and other intangibles	(220,000)	(233,000)	(240,000)
Acquisitions, net of cash acquired	(18,821,000)	(9,000,000)	0
Cash in escrow	(2,179,000)	0	0
Proceeds from sale of assets	900,000	669,000	584,000
Proceeds from insurance recovery	1,300,000	0	0
Premiums on life insurance	(3,071,000)	(2,604,000)	(1,595,000)
Net cash used in investing activities	(52,018,000)	(38,737,000)	(18,540,000)
CASH FLOWS FROM FINANCING ACTIVITIES:
Repayment of debt borrowings	(348,564,000)	(82,251,000)	0
Proceeds from debt borrowings	417,426,000	0	0
Stock options exercised	297,000	346,000	408,000
Excess tax benefits from stock-based payments	2,559,000	967,000	170,000
Debt financing costs	(2,014,000)	(1,019,000)	0
Settlement of Warrants	(219,451,000)	0	0
Non-controlling interest - contributions	1,194,000	156,000	0
Non-controlling interest - dividend	(251,000)	(181,000)	(259,000)
Dividends paid	(46,027,000)	(39,791,000)	(26,416,000)
Repurchase of common shares	(61,825,000)	(92,487,000)	(9,389,000)
Proceeds from sale of note hedge claim	0	0	17,060,000
Net cash used in financing activities	(256,656,000)	(214,260,000)	(18,426,000)
NET CHANGE IN CASH AND CASH EQUIVALENTS	(104,548,000)	(47,165,000)	144,907,000
Cash and Cash Equivalents, at Carrying Value	29,332,000	133,880,000	181,045,000
Cash payments for interest	2,308,000	566,000	597,000
Cash payments for income taxes	74,724,000	57,259,000	41,703,000
Financed capital expenditures	$ 1,273,000	$ 0	$ 1,810,000