Stock-Based Compensation - Schedule of Stock Options Activity (Details)	12 Months Ended
	Dec. 31, 2017 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding options, beginning of year, number of shares | shares	940,843
Exercised, number of shares | shares	(285,887)
Forfeited, number of shares | shares	(12,701)
Outstanding options, end of year, number of shares | shares	642,255
Outstanding options exercisable, end of year, number of shares | shares	642,255
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Outstanding options, beginning of year, weighted average exercise price (in dollars per share) | $ / shares	$ 16.77
Exercised, weighted average exercise price (in dollars per share) | $ / shares	18.15
Forfeited, weighted average exercise price (in dollars per share) | $ / shares	17.86
Outstanding options, end of year, weighted average exercise price (in dollars per share) | $ / shares	16.13
Outstanding options exercisable, end of year, weighted average exercise price (in dollars per share) | $ / shares	$ 16.13
Outstanding options, end of year weighted average remaining contractual term (in years)	2 years 4 months 3 days
Outstanding options exercisable, end of year, weighted average remaining contractual term (in years)	2 years 4 months 3 days