Statement of Cash Flows (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 216,612,000	$ 184,644,000	$ 145,401,000
Adjustments to reconcile income to net cash provided by operating activities:
Equity in earnings of affiliates	(646,000)	(274,000)	(376,000)
Share-based Compensation	18,381,000	17,165,000	8,517,000
Depreciation and amortization	22,917,000	23,303,000	23,113,000
Debt issuance costs amortization and finance charges	479,000	5,956,000	15,087,000
Loss on exchange of Senior Exchangeable Notes	0	1,012,000	1,939,000
Realization of pension obligation	(53,000)	303,000	137,000
(Increase) decrease in value of life insurance policies	(1,636,000)	285,000	(1,950,000)
Deferred Income Tax Expense (Benefit)	3,605,000	(6,549,000)	(10,135,000)
Other Noncash Income (Expense)	962,000	(695,000)	1,911,000
Changes in assets and liabilities, net of effects of acquisitions:
Accounts receivable	(16,664,000)	(12,082,000)	(22,412,000)
Inventories	3,224,000	(16,033,000)	(2,438,000)
Prepaid expenses and other current assets	(12,904,000)	(1,228,000)	21,455,000
Other assets	426,000	680,000	(102,000)
Accounts payable	(3,672,000)	11,969,000	11,701,000
Accrued expenses	4,871,000	(13,754,000)	13,701,000
Other long-term liabilities	1,300,000	9,424,000	283,000
Net cash provided by operating activities	237,202,000	204,126,000	205,832,000
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(31,151,000)	(29,927,000)	(27,569,000)
Patents and other intangibles	(1,648,000)	(220,000)	(233,000)
Acquisitions, net of cash acquired	(556,000)	(18,821,000)	(9,000,000)
Cash in escrow	2,188,000	(2,179,000)	0
Payments for (Proceeds from) Investments	(322,000)	0	0
Proceeds from sale of assets	667,000	900,000	669,000
Proceeds from insurance recovery	101,000	1,300,000	0
Premiums on life insurance	(3,283,000)	(3,071,000)	(2,604,000)
Net cash used in investing activities	(34,004,000)	(52,018,000)	(38,737,000)
CASH FLOWS FROM FINANCING ACTIVITIES:
Repayment of debt borrowings	(112,346,000)	(348,564,000)	(82,251,000)
Proceeds from debt borrowings	121,000,000	417,426,000	0
Stock options exercised	5,000	297,000	346,000
Excess tax benefits from stock-based payments	5,226,000	2,559,000	967,000
Debt financing costs	(7,000)	(2,014,000)	(1,019,000)
Settlement of Warrants	0	219,451,000	0
Non-controlling interest - contributions	1,800,000	1,194,000	156,000
Non-controlling interest - dividend	(300,000)	(251,000)	(181,000)
Dividends paid	(52,950,000)	(46,027,000)	(39,791,000)
Repurchase of common shares	(175,732,000)	(61,825,000)	(92,487,000)
Net cash used in financing activities	(213,304,000)	(256,656,000)	(214,260,000)
NET CHANGE IN CASH AND CASH EQUIVALENTS	(10,106,000)	(104,548,000)	(47,165,000)
Cash and Cash Equivalents, at Carrying Value	19,226,000	29,332,000	133,880,000
Cash payments for interest	7,352,000	2,308,000	566,000
Cash payments for income taxes	85,660,000	74,724,000	57,259,000
Financed capital expenditures	$ 3,910,000	$ 1,273,000	$ 0