Investments and Fair Value Measurements (Details 4) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012
Summary of accumulated other-than-temporary credit-related impairments charged to retained earnings and other income (expense), net
Impairments charged to retained earnings	$ 58
Impairments recognized in other income (expense), net	824
Accumulated impairments, net, attributable to assets still held at June 30, 2012	$ 882