Employee Benefit Plans - Additional Information (Details) - Deferred Compensation Plan - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Deferred compensation arrangements, overall, description	We maintain a Non-Qualified Deferred Compensation Plan (the “Deferred Compensation Plan”) for executive officers, key employees and members of the Board of Directors. The Deferred Compensation Plan allows eligible participants to defer the receipt of eligible compensation, including equity awards, until designated future dates. We offset our obligations under the Deferred Compensation Plan by investing in the actual underlying investments. These investments are classified as trading securities and are carried at fair value. At March 31, 2018 and December 31, 2017, these investments totaled approximately $9.2 million and $8.8 million, respectively. All gains and losses in these investments are materially offset by corresponding gains and losses in the Deferred Compensation Plan liabilities.
Deferred compensation plan assets	$ 9.2	$ 8.8