Consolidated Statements Of Stockholders' (Deficiency) Equity (USD $) In Thousands	Class A Common Stock [Member]	Class B Common Stock [Member]	Paid-In Capital [Member]	Accumulated Deficit [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Loss [Member]	Total
Balance at Dec. 31, 2011	$ 586	$ 135	$ 5,942	$ (1,029,954)	$ (1,677)	$ (12,027)	$ (1,036,995)
Net income				43,181			43,181
Other comprehensive loss (see Note 6)						(517)	(517)
Share-based compensation expense			3,583				3,583
Proceeds from exercise of stock options	2		1,826				1,828
Treasury stock acquired from forfeiture and acquisition of restricted shares (see Note 8)					(15,937)		(15,937)
Balance at Mar. 31, 2012	$ 588	$ 135	$ 11,351	$ (986,773)	$ (17,614)	$ (12,544)	$ (1,004,857)