Fair Value Measurements (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified	Jun. 30, 2012
Fair value information related to assets
Assets
Other mutual funds [Member]
Fair value information related to assets
Assets	1,300
Money market funds [Member]
Fair value information related to assets
Assets	1,170
Quoted Prices in Active Markets (Level 1) [Member]
Fair value information related to assets
Assets	2,470
Quoted Prices in Active Markets (Level 1) [Member] | Other mutual funds [Member]
Fair value information related to assets
Assets	1,300
Quoted Prices in Active Markets (Level 1) [Member] | Money market funds [Member]
Fair value information related to assets
Assets	1,170
Significant Other Observable Inputs (Level 2) [Member] | Other mutual funds [Member]
Fair value information related to assets
Assets
Significant Other Observable Inputs (Level 2) [Member] | Money market funds [Member]
Fair value information related to assets
Assets
Significant Unobserved Inputs (Level 3) [Member] | Other mutual funds [Member]
Fair value information related to assets
Assets
Significant Unobserved Inputs (Level 3) [Member] | Money market funds [Member]
Fair value information related to assets
Assets