Fair Value Measurements - Recurring and Nonrecurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Fair value information related to assets
Assets	$ 4,513	$ 2,310
Quoted Prices in Active Markets (Level 1)
Fair value information related to assets
Assets	4,513	2,310
Money market funds
Fair value information related to assets
Assets	2,118	118
Money market funds | Quoted Prices in Active Markets (Level 1)
Fair value information related to assets
Assets	2,118	118
Other mutual funds
Fair value information related to assets
Assets	2,395	2,192
Other mutual funds | Quoted Prices in Active Markets (Level 1)
Fair value information related to assets
Assets	$ 2,395	$ 2,192