Fair Value Measurements - Summary of Fair Value Assets Measured on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands		Sep. 30, 2017	Dec. 31, 2016
Fair value information related to assets
Assets		$ 2,679	$ 2,180
Quoted Prices in Active Markets (Level 1)
Fair value information related to assets
Assets		2,679	2,180
Money market funds
Fair value information related to assets
Assets	[1]	119	118
Money market funds | Quoted Prices in Active Markets (Level 1)
Fair value information related to assets
Assets	[1]	119	118
Other mutual funds
Fair value information related to assets
Assets	[2]	2,560	2,062
Other mutual funds | Quoted Prices in Active Markets (Level 1)
Fair value information related to assets
Assets	[2]	$ 2,560	$ 2,062

[1] Money market mutual funds are included in “Cash and cash equivalents” in the condensed consolidated balance sheets. These investments are classified as available-for-sale and were recorded at fair value. There have been no realized gains or losses related to these investments and the Company has not experienced any redemption restrictions with respect to any of the money market mutual funds.

[2] Other mutual funds are included in “Other investments and assets” in the condensed consolidated balance sheets. These investments are classified as available-for-sale and were recorded at fair value. As of September 30, 2017 and December 31, 2016, there were unrealized gains of $0.9 million ($0.6 million after-tax) and $0.7 million ($0.4 million after tax), respectively, which were included in “Accumulated other comprehensive income (loss)” (“AOCI”) in the condensed consolidated balance sheets.