Unaudited Condensed Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Condensed Consolidated Statements of Comprehensive Income (Loss) [Abstract]
Amortization of acquired intangible assets	$ 2,014	$ 518	$ 5,605	$ 2,248