Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Accumulated Comprehensive Income [Roll Forward]
Balance at December 31, 2011			$ (188,389)
Current period other comprehensive loss	(9,335)	(157)	(9,486)	600
Balance at June 30, 2012	(197,875)		(197,875)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Comprehensive Income [Roll Forward]
Balance at December 31, 2011			(188,389)
Current period other comprehensive loss			(9,486)
Balance at June 30, 2012	(197,875)		(197,875)
Unrealized Gain (Loss) On Available-For-Sale Securities [Member]
Accumulated Comprehensive Income [Roll Forward]
Balance at December 31, 2011			4,822
Current period other comprehensive loss			(8,548)
Balance at June 30, 2012	(3,726)		(3,726)
Cumulative Translation Adjustment [Member]
Accumulated Comprehensive Income [Roll Forward]
Balance at December 31, 2011			2,119
Current period other comprehensive loss			(938)
Balance at June 30, 2012	1,181		1,181
Change In Net Pension And Other Benefit Obligations [Member]
Accumulated Comprehensive Income [Roll Forward]
Balance at December 31, 2011			(195,330)
Current period other comprehensive loss			0
Balance at June 30, 2012	$ (195,330)		$ (195,330)