Stock-Based Compensation - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Compensation cost not yet recognized	$ 8.0		$ 8.0
Compensation cost not yet recognized, period of recognition			3 years 7 months 10 days
Options granted in period (in shares)	21,000	21,233	805,375	618,033