Stock-Based Compensation (Narrative) (Details) - USD ($)		12 Months Ended
	Jul. 22, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Sep. 30, 2020	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized		500,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized					3,730,320
Stock-based compensation cost		$ 1,178,000	$ 857,000	$ 1,082,000
Other comprehensive loss, net of taxes		$ 440,000	46,000	(10,000)
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock option compensation expense not yet recognized			1,900,000
Weighted-average period for recognition of cost not yet recognized		2 years 9 months 18 days
Stock-based compensation cost		$ 424,000	331,000	326,000
Restricted stock and restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock option compensation expense not yet recognized			1,900,000
Weighted-average period for recognition of cost not yet recognized		2 years 10 months 24 days
Stock-based compensation cost		$ 754,000	$ 521,000	$ 566,000
Nonvested restricted stock or performance stock units granted during year		577,000	230,000	279,000
Performance stock units forfeited during year		(114,000)	(31,000)	(3,000)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period		244,000	198,000	186,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number		528,000	309,000	308,000		218,000
Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation cost		$ 0	$ 5,000	$ 190,000
Nonvested restricted stock or performance stock units granted during year		0	0	169,000
Performance stock units forfeited during year		(41,000)	(9,000)	(45,000)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period		0	98,000	116,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number		0	41,000	148,000		140,000
2007 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant		640,205
Granted non-qualified options to purchase shares of common stock		658,000	39,000	758,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number		1,265,000	1,060,000	1,442,000		1,288,000
2007 Stock Incentive Plan | Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number		0
2018 Performance Stock Units | Restricted stock and restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested restricted stock or performance stock units granted during year			98,492
2018 Performance Stock Units | Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested restricted stock or performance stock units granted during year		0	0	169,000
Performance stock units forfeited during year		(41,000)	(9,000)	(21,000)
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage			100.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period		0	98,000	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number		0	40,599	148,000		0
2017 Performance Stock Units | Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested restricted stock or performance stock units granted during year		0	0	0
Performance stock units forfeited during year		0	0	(24,000)
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage			22.10%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period		0	0	116,168
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number		0	0	0		140,493
Other comprehensive loss, net of taxes				$ 25,726
Non-shareholder approved plan | Equity Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted non-qualified options to purchase shares of common stock	457,692
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	7 years