Share Based Compensation (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Share based compensation arrangements [Line Items]
Number of additional shares approved for grant (in shares)	300,000
Total compensation cost not yet recognized	$ 2,500,000
Total compensation cost not yet recognized, period for recognition	2 years 1 month 6 days
Information regarding options exercised [Abstract]
Intrinsic value	56,000	15,000
Cash proceeds received	15,000	10,000
Tax benefit realized	20,000	5,000
Long-term incentive plan [Member]
Share based compensation arrangements [Line Items]
Total compensation expense (recovery) recognized	400,000	200,000
Tax benefit relating to compensation expense recognized	100,000	100,000
Stock Options [Member]
Outstanding stock option grants and transaction [Roll Forward]
Outstanding, beginning balance (in shares)	281,820
Granted (in shares)	0
Exercised (in shares)	(5,764)
Forfeited (in shares)	(1,132)
Expired (in shares)	(167)
Outstanding, ending balance (in shares)	274,757
Vested and expected to vest, period end (in shares)	271,678
Exercisable, period end (in shares)	195,452
Weighted Average Exercise Price [Roll Forward]
Outstanding, beginning balance (in dollars per share)	$ 4.69
Exercised (in dollars per share)	$ 2.65
Forfeited (in dollars per share)	$ 4.89
Expired (in dollars per share)	$ 6.42
Outstanding, ending balance (in dollars per share)	$ 4.73
Vested and expected to vest, period end (in dollars per share)	$ 4.73
Exercisable, period end (in dollars per share)	$ 4.68
Weighted-Average Remaining Contractual Term [Abstract]
Outstanding, Weighted Average Remaining Contractual Term	6 years 10 months 13 days
Vested and Expected to Vest, Weighted-Average Remaining Contractual Term	6 years 10 months 6 days
Exercisable, Weighted Average Remaining Contractual Term	6 years 5 months 16 days
Aggregate intrinsic value [Abstract]
Outstanding, Aggregate Intrinsic Value	2,306,000
Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value	2,283,000
Exercisable, Aggregate Intrinsic Value	1,675,000
Non-Vested Restricted Stock, Restricted Stock Units and PSU's [Member]
Number of Shares [Roll Forward]
Outstanding, beginning balance (in shares)	407,130
Granted (in shares)	105,757
Vested (in shares)	(22,119)
Forfeited (in shares)	(2,198)
Outstanding, ending balance (in shares)	488,570
Weighted Average Grant Date Fair Value [Roll Forward]
Outstanding, beginning balance (in dollars per share)	$ 6.31
Granted (in dollars per share)	$ 13.04
Vested (in dollars per share)	$ 12.78
Forfeited (in dollars per share)	$ 13.05
Outstanding, ending balance (in dollars per share)	$ 7.45
Director [Member]
Share based compensation arrangements [Line Items]
Shares issues as retainer fees (in shares)	1,000	4,000
Non-Employee Directors [Member]
Share based compensation arrangements [Line Items]
Number of additional shares approved for grant (in shares)	200,000
Total compensation expense (recovery) recognized	20,000	50,000
Tax benefit relating to compensation expense recognized	$ 10,000	$ 20,000
Officers [Member] | Restricted Stock [Member] | Long-term incentive plan [Member]
Share based compensation arrangements [Line Items]
Number of stock units or restricted shares issued in period (in shares)	70,000	70,000
Vesting period	3 years	3 years
Officers [Member] | Performance stock units [Member] | Long-term incentive plan [Member]
Share based compensation arrangements [Line Items]
Number of stock units or restricted shares issued in period (in shares)	30,000	30,000
Vesting period	3 years	3 years