Condensed Consolidated Statement of Stockholders' Equity (Unaudited) (USD $) In Thousands	Total	Paid-In Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Loss	Common Class A	Common Class B
Balance beginning at Dec. 31, 2010	$ 464,695	$ 666,961	$ 53,427	$ (237,688)	$ (18,683)	$ 557	$ 121
Balance beginning, shares at Dec. 31, 2010						55,739	12,029
Shares awarded under stock compensation plans, shares						280
Shares awarded under stock compensation plans	524	521				3
Purchases of treasury stock	(9,112)			(9,112)
Income tax benefit associated with stock compensation plans	1,143	1,143
Fair value of interest rate swap agreements, net of tax benefit of $2,242	(3,660)				(3,660)
Derecognition of equity component of 5.0% Convertible Notes, net of tax benefit of $71	(2,659)	(2,659)
Stock-based compensation expense	327	327
Restricted stock amortization, net of forfeitures	2,348	2,348
Net income	55,716		55,716
Dividends ($0.075 per share, cumulative)	(3,976)		(3,976)
Other, shares						288
Other	0	(3)	0			3
Balance ending at Sep. 30, 2011	$ 505,346	$ 668,638	$ 105,167	$ (246,800)	$ (22,343)	$ 563	$ 121
Balance ending, shares at Sep. 30, 2011						56,307	12,029