Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statements Of Operations [Abstract]
Net revenues (Note 13)	$ 1,847,520	$ 1,669,205	$ 1,550,477
Costs and expenses:
Cost of goods and services	579,509	453,905	431,291
Operating expenses	427,958	399,393	389,759
Selling, general and administrative expenses	349,488	333,094	330,589
Bad debt expense	36,950	31,849	23,257
Depreciation and amortization expense	125,504	116,783	118,120
Total costs and expenses	1,519,409	1,335,024	1,293,016
Operating income	328,111	334,181	257,461
Other income (expenses):
Interest income	587	541	886
Interest expense (Note 8)	(38,305)	(36,229)	(34,960)
Total nonoperating income (expense)	(37,718)	(35,688)	(34,074)
Income before income taxes	290,393	298,493	223,387
Income tax expense (Note 9)	113,082	116,919	87,291
Net income	$ 177,311	$ 181,574	$ 136,096
Earnings per common share (Note 14):
Basic, Earnings per common share	$ 1.98	$ 1.91	$ 1.33
Diluted, Earnings per common share	$ 1.93	$ 1.87	$ 1.32
Dividends declared per common share (Note 11)	$ 0.80	$ 0.40	$ 0.00
Weighted average number of common shares outstanding (Note 11)	89,678	95,295	102,114
Weighted average number of common shares and common share equivalents outstanding (Note 11)	91,934	97,130	102,746