(Loss) Earnings Per Share - Reconciliation of Number of Common Shares Used in Calculation of Basic and Diluted Earnings Per Share (EPS) (Details) - $ / shares	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Basic ((loss) EPS (in shares)									16,711,534	16,654,786	17,288,665
Effect of dilutive securities (in shares)									0	26,924	100,808
Diluted (loss) EPS (in shares)									16,711,534	16,681,710	17,389,473
Securities excluded from the determination of weighted average shares for the calculation of diluted (loss) EPS, as they were antidilutive (in shares)									1,049,563	1,046,947	870,421
Basic (loss) EPS (in dollars per share)	$ (0.66)	$ 0.10	$ (0.22)	$ (0.09)	$ 0.21	$ 0.07	$ 0.20	$ 0.19	$ (0.87)	$ 0.67	$ 0.74
Effect of dilutive securities (in dollars per share)									0.00	0.00	0.00
Diluted (loss) EPS (in dollars per share)	$ (0.66)	$ 0.10	$ (0.22)	$ (0.09)	$ 0.21	$ 0.07	$ 0.20	$ 0.19	$ (0.87)	$ 0.67	$ 0.74