Significant Accounting Policies - Stock Transactions - Stock Options Outstanding And Exercisable (Details)	6 Months Ended
	Jun. 30, 2016 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding: Shares Outstanding | shares	545,871
Options Outstanding: Weighted Average Remaining Contractual Life	5 years 4 months 24 days
Options Outstanding: Weighted Average Exercise Price (in dollars per share)	$ 7.79
Options Exercisable: Shares Exercisable | shares	392,042
Options Exercisable: Weighted Average Exercise Price (in dollars per share)	$ 6.81
0.00 - 4.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, lower (in dollars per share)	0.00
Range of exercise prices, upper (in dollars per share)	$ 4.00
Options Outstanding: Shares Outstanding | shares	87,000
Options Outstanding: Weighted Average Remaining Contractual Life	2 years 8 months 12 days
Options Outstanding: Weighted Average Exercise Price (in dollars per share)	$ 3.85
Options Exercisable: Shares Exercisable | shares	87,000
Options Exercisable: Weighted Average Exercise Price (in dollars per share)	$ 3.85
4.01 - 8.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, lower (in dollars per share)	4.01
Range of exercise prices, upper (in dollars per share)	$ 8.00
Options Outstanding: Shares Outstanding | shares	265,425
Options Outstanding: Weighted Average Remaining Contractual Life	4 years 10 months 24 days
Options Outstanding: Weighted Average Exercise Price (in dollars per share)	$ 6.79
Options Exercisable: Shares Exercisable | shares	247,593
Options Exercisable: Weighted Average Exercise Price (in dollars per share)	$ 6.71
8.01 - 12.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, lower (in dollars per share)	8.01
Range of exercise prices, upper (in dollars per share)	$ 12.00
Options Outstanding: Shares Outstanding | shares	102,551
Options Outstanding: Weighted Average Remaining Contractual Life	9 years 1 month 6 days
Options Outstanding: Weighted Average Exercise Price (in dollars per share)	$ 9.71
Options Exercisable: Shares Exercisable | shares	15,554
Options Exercisable: Weighted Average Exercise Price (in dollars per share)	$ 9.32
12.01 - 16.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, lower (in dollars per share)	12.01
Range of exercise prices, upper (in dollars per share)	$ 16.00
Options Outstanding: Shares Outstanding | shares	90,895
Options Outstanding: Weighted Average Remaining Contractual Life	5 years 4 months 24 days
Options Outstanding: Weighted Average Exercise Price (in dollars per share)	$ 12.32
Options Exercisable: Shares Exercisable | shares	41,895
Options Exercisable: Weighted Average Exercise Price (in dollars per share)	$ 12.62