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Stock-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
2005 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized	2,000,000
2005 Plan [Member] | One-Year [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year
2005 Plan [Member] | Three-Year [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
2016 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration date	June 2026
Number of shares authorized	3,500,000
Percentage of legal entity controlled by optionee	100.00%
Maximum [Member] | 2005 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise period of options	10 years
Vesting period	4 years
Maximum [Member] | 2016 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise period of options	10 years
Minimum [Member] | 2005 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	6 months
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target PSU's, Granted	413,964	132,253	141,002
Vesting period	3 years
Market Conditions	25.00%
Performance Conditions	75.00%
Unrecognized compensation expense related to unvested stock options	$ 2.0
Expected period of recognition for unrecognized compensation cost	1 year 9 months 18 days
Performance Shares [Member] | 2016 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target PSU's, Granted	774,390
Performance Shares [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target Grant	200.00%
Performance Shares [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target Grant	0.00%
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted
Options outstanding	1,171,352	1,173,852
Closing stock price per share	$ 6.39
Unrecognized compensation expense related to unvested stock options	$ 0.2
Directors [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted	0
Options outstanding	106,700
Weighted average exercise price per share of options outstanding	$ 6.98

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