Consolidated Statement of Cash Flows Statement (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 56,732	$ 53,930
Stock-based compensation	5,138	4,388
Depreciation and amortization	6,025	5,883
Gain on insurance recovery	(539)	(3,366)
Increase in value of life insurance policies	(1,368)	(1,661)
Deferred income taxes	975	(1,091)
Other Noncash Income (Expense)	278	452
Accounts receivable	(14,811)	2,195
Inventories	(1,876)	(5,055)
Prepaid expenses and other current assets	4,360	(2,822)
Other assets	403	(932)
Accounts payable	(681)	(7,315)
Accrued expenses	4,638	(2,144)
Increase (Decrease) in Deferred Revenue	6,867	6,603
Other long-term liabilities	2,117	4,724
Net cash provided by operating activities	68,258	53,789
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(8,443)	(7,297)
Payments to Acquire Intangible Assets	(847)	(147)
Proceeds from sale of assets	377	136
Premiums on life insurance	(654)	(679)
Net cash used in investing activities	(9,567)	(7,987)
CASH FLOWS FROM FINANCING ACTIVITIES:
Repayment of debt borrowings	(18,013)	(26,867)
Proceeds from debt borrowings	25,000	1,000
Proceeds from Stock Options Exercised	35	0
Excess Tax Benefit from Share-based Compensation, Financing Activities	553	500
Payments of Debt Issuance Costs	0	(7)
Payments of Dividends	(14,820)	(13,334)
Payments for Repurchase of Common Stock	(47,745)	(12,889)
Net cash used in financing activities	(54,990)	(51,597)
NET CHANGE IN CASH AND CASH EQUIVALENTS	3,701	(5,795)
CASH AND CASH EQUIVALENTS, beginning of period	$ 19,226