Stock-Based Compensation (Stock Options) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option shares, Outstanding at beginning of period	1,314,435
Option Shares, Granted	0
Option Shares, Exercised	(24,274)
Option Shares, Cancelled or forfeited	(3,750)
Option shares, Outstanding at end of period	1,276,411	1,314,435
Weighted Average Exercise Price, Beginning Balance	$ 4.98
Weighted Average Exercise Price, granted	0.00
Weighted Average Exercise Price, exercised	3.19
Weighted Average Exercise Price, cancelled or forfeited	5.05
Weighted Average Exercise Price, Ending Balance	$ 4.98	$ 4.98
Weighted Average Remaining Contractual Term	6 years 10 months 17 days	7 years 9 months 7 days
Options Exercisable	1,276,411	979,435
Weighted-Average Exercise Price	$ 4.98	$ 4.95
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option shares, Outstanding at beginning of period	1,314,435
Option Shares, Granted	0	0	0
Option Shares, Exercised	(24,274)
Option Shares, Cancelled or forfeited	(3,750)
Options Shares, Expired	(10,000)
Option shares, Outstanding at end of period	1,276,411	1,314,435
Weighted Average Exercise Price, Beginning Balance	$ 4.98
Weighted Average Exercise Price, granted	0.00
Weighted Average Exercise Price, exercised	3.19
Weighted Average Exercise Price, cancelled or forfeited	5.05
Weighted Average Exercise Price, Expired	9.00
Weighted Average Exercise Price, Ending Balance	$ 4.98	$ 4.98
Weighted Average Remaining Contractual Term	6 years 10 months 17 days	7 years 9 months 7 days
Options Exercisable	1,276,411	979,435
Weighted-Average Exercise Price	$ 4.98	$ 4.95