Discontinued Operations (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Operating income (loss):
Total operating income (loss)									$ 78	$ (512)	$ (7,795)
Interest expense, net of amounts capitalized											(1)
Interest income									60	32
Other gains and (losses)
Disposal Group Including Discontinued Operation Other Gains and Losses									38	663	119
Income (loss) before income taxes									176	183	(7,677)
(Provisions) benefit for income taxes									(67)	2,887	540
Income (loss) from discontinued operations	48	53	4	4	(255)	46	3,327	(48)	109	3,070	(7,137)
Corporate Magic [Member]
Revenues:
Revenues										2,389	6,276
Operating income (loss):
Total operating income (loss)									56	(716)	(7,708)
Other gains and (losses)
Disposal Group Including Discontinued Operation Other Gains and Losses										618
Other [Member]
Operating income (loss):
Total operating income (loss)									22	204	(87)
Other gains and (losses)
Disposal Group Including Discontinued Operation Other Gains and Losses									$ 38	$ 45	$ 119