Stockholders' Equity and Stock-Based Compensation - Summary of Activity of Stock Options (Details)	3 Months Ended
	Mar. 31, 2018 $ / shares shares
Activity of stock option plans [Roll Forward]
Number of Shares Outstanding (Options), Beginning Balance (in shares) | shares	216,326
Number of Shares Outstanding (Options), Exercised (in shares) | shares	(43,614)
Number of Shares Outstanding (Options), Ending Balance (in shares) | shares	172,712
Number of Shares Outstanding (Options), Exercisable (in shares) | shares	172,712
Weighted average exercise price for stock option plans [Roll Forward]
Weighted Average Exercise Price, Beginning Balance (in dollars per share) | $ / shares	$ 16.82
Weighted Average Exercise Price, Exercised (in dollars per share) | $ / shares	16.13
Weighted Average Exercise Price, Ending Balance (in dollars per share) | $ / shares	16.99
Weighted Average Exercise Price, Exercisable (in dollars per share) | $ / shares	$ 16.99