Stock-Based Plans and Stock-Based Compensation - Stock Option Activity (Details) - Stock options - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2017
Stock Option Activity [Roll Forward]
Outstanding at beginning of period (in shares)	440,247
Granted (in shares)	0
Exercised (in shares)	(30,826)
Cancelled (in shares)	(49,708)
Outstanding at end of period (in shares)	359,713
Weighted Average Exercise Price [Roll Forward]
Outstanding at beginning of period (usd per share)	$ 9.83
Granted (usd per share)	0.00
Exercised (usd per share)	9.84
Cancelled (usd per share)	9.42
Outstanding at end of period (usd per share)	$ 9.88
Options, Additional Disclosures [Abstract]
Options outstanding, Number (in shares)	440,247	359,713
Options exercisable, Number (in shares)		195,059
Options outstanding, Weighted average exercise price (usd per share)	$ 9.83	$ 9.88
Options exercisable, Weighted average exercise price (usd per share)		$ 9.91
Options outstanding, Aggregate intrinsic value		$ 3,351
Options exercisable, aggregate intrinsic value		$ 1,812
Options outstanding, Weighted average remaining contractual term	6 years 8 months
Options exercisable, Weighted average remaining contractual term	6 years 1 month