Consolidated Statement of Cash Flows Statement (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 61,153	$ 56,732
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation	5,279	5,138
Depreciation and amortization	6,633	6,025
(Gain) on insurance recovery	0	(539)
(Increase) decrease in value of life insurance policies	(401)	(1,368)
Deferred income taxes	(2,818)	975
Other non-cash items	(163)	278
Changes in assets and liabilities:
Accounts receivable	(7,098)	(14,811)
Inventories	(4,157)	(1,876)
Prepaid expenses and other current assets	(5,109)	4,360
Other assets	639	403
Accounts payable	915	(681)
Accrued expenses	9,670	11,505
Other long-term liabilities	1,081	2,117
Net cash provided by operating activities	65,624	68,258
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(7,668)	(8,443)
Patents and other intangibles	0	(847)
Business acquisition, net of cash acquired	(1,200)	0
Proceeds from sale of assets	227	377
Premiums on life insurance	(1,834)	(654)
Net cash used in investing activities	(10,475)	(9,567)
CASH FLOWS FROM FINANCING ACTIVITIES:
Repayment of debt	(28,011)	(18,013)
Proceeds from debt	40,000	25,000
Stock options exercised	0	35
Excess tax benefits from stock-based compensation	329	553
Dividends paid	(22,491)	(14,820)
Repurchase of common shares	(46,811)	(47,745)
Net cash used in financing activities	(56,984)	(54,990)
NET CHANGE IN CASH AND CASH EQUIVALENTS	(1,835)	3,701
CASH AND CASH EQUIVALENTS, beginning of period	25,088	19,226
CASH AND CASH EQUIVALENTS, end of period	$ 23,253	$ 22,927