Share Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Share Based Compensation [Abstract]
Number of additional shares approved for grant (in shares)	500,000
Total compensation cost not yet recognized	$ 3,100
Total compensation cost not yet recognized, period for recognition	2 years 2 months 12 days
Information regarding options exercised [Abstract]
Intrinsic value	$ 836	$ 78
Cash proceeds received	695	13
Tax benefit realized	176	16
Long-Term Incentive Plan [Member]
Share Based Compensation [Abstract]
Total compensation expense recognized	400	400
Tax benefit relating to compensation expense recognized	$ 100	$ 100
Stock Options [Member]
Number of Shares [Roll Forward]
Outstanding, beginning balance (in shares)	211,421
Granted (in shares)	0
Exercised (in shares)	(68,399)
Forfeited (in shares)	0
Expired (in shares)	(558)
Outstanding, ending balance (in shares)	142,464
Vested and expected to vest, period end (in shares)	142,464
Exercisable, period end (in shares)	142,464
Average Exercise Price [Roll Forward]
Outstanding, beginning balance (in dollars per share)	$ 6.48
Exercised (in dollars per share)	10.16
Expired (in dollars per share)	22.35
Outstanding, ending balance (in dollars per share)	4.66
Vested and expected to vest, period end (in dollars per share)	4.66
Exercisable, period end (in dollars per share)	$ 4.66
Weighted-Average Remaining Contractual Term (Years) [Abstract]
Outstanding, weighted average remaining contractual term	3 years 9 months 18 days
Vested and expected to vest, weighted-average remaining contractual term	3 years 9 months 18 days
Exercisable, weighted average remaining contractual term	3 years 9 months 18 days
Aggregate Intrinsic Value [Abstract]
Outstanding, aggregate intrinsic value	$ 2,401
Vested and expected to vest, aggregate intrinsic value	2,401
Exercisable, aggregate intrinsic value	$ 2,401
Restricted Stock [Member] | Long-Term Incentive Plan [Member]
Share Based Compensation [Abstract]
Number of stock units or restricted shares issued in period (in shares)	2,000	2,000
Vesting period	3 years	3 years
Non-Vested Restricted Stock and PSUs [Member]
Number of Shares [Roll Forward]
Outstanding, beginning balance (in shares)	258,419
Granted (in shares)	74,732
Vested (in shares)	(85,788)
Forfeited (in shares)	(10,780)
Outstanding, ending balance (in shares)	236,583
Weighted Average Grant Date Fair Value [Roll Forward]
Outstanding, beginning balance (in dollars per share)	$ 19.00
Granted (in dollars per share)	23.07
Vested (in dollars per share)	14.55
Forfeited (in dollars per share)	22.94
Outstanding, ending balance (in dollars per share)	$ 21.73
Non-Employee Directors [Member]
Share Based Compensation [Abstract]
Number of additional shares approved for grant (in shares)	200,000
Total compensation expense recognized	$ 50	$ 50
Tax benefit relating to compensation expense recognized	$ 10	$ 10
Executive Officers [Member] | Restricted Stock [Member] | Long-Term Incentive Plan [Member]
Share Based Compensation [Abstract]
Number of stock units or restricted shares issued in period (in shares)	50,000	40,000
Vesting period	3 years	3 years
Executive Officers [Member] | Performance Stock Units [Member] | Long-Term Incentive Plan [Member]
Share Based Compensation [Abstract]
Number of stock units or restricted shares issued in period (in shares)	20,000	20,000
Vesting period	3 years	3 years
Performance feature comparison period	3 years
Directors [Member]
Share Based Compensation [Abstract]
Shares issues as retainer fees (in shares)	3,000	2,000