Stock-Based Compensation - Share Option Activity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding (in shares)	28,125
Exercised (in shares)	(11,500)
Forfeited or expired (in shares)	(375)
Outstanding (in shares)	16,250	28,125
Exercisable (in shares)	16,250
Vested (in shares)	16,250
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Outstanding, weighted-average exercise price (in dollars per share)	$ 8.20
Exercised, weighted-average exercise price (in dollars per share)	7.98
Forfeited or expired, weighted-average exercise price (in dollars per share)	7.80
Outstanding, weighted-average exercise price (in dollars per share)	8.37	$ 8.20
Exercisable, weighted-average exercise price (in dollars per share)	8.37
Vested, weighted-average exercise price (in dollars per share)	$ 8.37
Outstanding, average remaining contractual term (in years)	3 years 8 months 24 days	4 years 8 months 24 days
Exercisable, average remaining contractual term (in years)	3 years 8 months 24 days
Vested, average remaining contractual term	3 years 8 months 24 days
Outstanding, aggregate intrinsic value	$ 804,000	$ 890,000
Exercisable, aggregate intrinsic value	804,000
Vested, aggregate intrinsic value	804,000
Total intrinsic value of share options exercised	400,000	200,000	$ 1,300,000
Options, vested in period, fair value	$ 0	$ 4,000	$ 100,000
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	4 years
Contractual term	10 years
Grants in period (in shares)	0	0	0
Expected volatility factor				46.25%
Expected dividend yield (percent)				0.00%
Expected term (in years)				6 years 3 months
Risk free interest rate (percent)				2.03%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Total compensation cost not yet recognized	$ 0	$ 0	$ 3,000
Total compensation cost not yet recognized, period for recognition			8 months 12 days