Stock Based Compensation (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2013
Number of Shares [Roll Forward]
Beginning Balance (in shares)	1,820	2,058	2,054
Granted (in shares)	191	147	126
Exercised (in shares)	(164)	(272)	(121)
Cancelled (in shares)	(316)	(113)	(1)
Ending Balance (in shares)	1,531	1,820	2,058	2,054
Vested at December 31 (in shares)	1,204
Exercisable at December 31 (in shares)	1,204
Weighted Average Exercise Price Per Share [Roll Forward]
Beginning Balance (in dollars per share)	$ 15.08	$ 14.28	$ 13.77
Granted (in dollars per share)	$ 11.29	$ 12.00	$ 17.62
Exercised (in dollars per share)	$ 10.18	$ 9.39	$ 9.27
Cancelled (in dollars per share)	$ 16.51	$ 9.98	$ 8.90
Ending Balance (in dollars per share)	$ 14.89	$ 15.08	$ 14.28	$ 13.77
Vested at December 31 (in dollars per share)	$ 15.63
Exercisable at December 31 (in dollars per share)	$ 15.63
Weighted Average Remaining Term [Abstract]
Weighted average remaining term, outstanding	4 years 3 months 4 days	3 years 8 months 16 days	3 years 11 months 8 days	4 years 10 months 6 days
Exercisable at December 31, 2013	3 years 0 months 11 days
Aggregate Intrinsic Value [Abstract]
Aggregate intrinsic value, outstanding	$ 2,369	$ 1,520	$ 1,496	$ 13,978
Exercisable at December 31	1,378
Weighted-average grant-date fair value of options granted (in dollars per share)	$ 4.75	$ 4.95	$ 7.90
Total intrinsic value for options exercised	484	988	908
Cash received from option exercises under all plans	1,618	2,681	1,073
Tax benefit from stock options exercised	247	244	293
Unrecognized compensation cost related to nonvested options and restricted shares outstanding	986	880	959
Weighted average period over which cost is expected to be recognized	1 year 10 months 24 days
Number of Shares [Roll Forward]
Nonvested, Beginning Balance (in shares)	252	261	320
Granted (in shares)	191	147	126
Vested (in shares)	(108)	(152)	(185)
Forfeited (in shares)	(8)	(4)
Nonvested, Ending Balance (in shares)	327	252	261	320
Weighted Average Grant Date Fair Value Per Share [Roll Forward]
Nonvested, Beginning Balance (in dollars per share)	$ 6.12	$ 6.35	$ 4.93
Granted (in dollars per share)	$ 4.75	$ 4.95	$ 7.90
Vested (in dollars per share)	$ 6.60	$ 5.36	$ 4.95
Forfeited (in dollars per share)	$ 7.82	$ 5.60
Nonvested, Ending Balance (in dollars per share)	$ 5.11	$ 6.12	$ 6.35	$ 4.93
Schedule of Share based Compensation, Shares Outstanding under Stock Option Plans, by Exercise Price Range [Abstract]
Number outstanding (in shares)					1,531
Number exercisable (in shares)	1,204
Stock based compensation expense	1,644	3,129	2,098
Amounts related to employee stock-based compensation capitalized as assets during the three years	0
6.20 - 8.26 [Member]
Schedule of Share based Compensation, Shares Outstanding under Stock Option Plans, by Exercise Price Range [Abstract]
Range of exercise price, minimum (in dollars per share)	$ 6.20
Range of exercise price, maximum (in dollars per share)	$ 8.26
Number outstanding (in shares)					116
Weighted average remaining contractual life	5 years 3 months 18 days
Weighted average exercise price (in dollars per share)	$ 6.96
Number exercisable (in shares)	116
Weighted average exercise price (in dollars per share)	$ 6.96
8.26-10.33 [Member]
Schedule of Share based Compensation, Shares Outstanding under Stock Option Plans, by Exercise Price Range [Abstract]
Range of exercise price, minimum (in dollars per share)	$ 8.26
Range of exercise price, maximum (in dollars per share)	$ 10.33
Number outstanding (in shares)					53
Weighted average remaining contractual life	9 years 3 months 18 days
Weighted average exercise price (in dollars per share)	$ 10.02
Number exercisable (in shares)	0
Weighted average exercise price (in dollars per share)	$ 0
10.33-12.39 [Member]
Schedule of Share based Compensation, Shares Outstanding under Stock Option Plans, by Exercise Price Range [Abstract]
Range of exercise price, minimum (in dollars per share)	$ 10.33
Range of exercise price, maximum (in dollars per share)	$ 12.39
Number outstanding (in shares)					255
Weighted average remaining contractual life	8 years 8 months 12 days
Weighted average exercise price (in dollars per share)	$ 11.58
Number exercisable (in shares)	43
Weighted average exercise price (in dollars per share)	$ 11.72
12.39-14.45 [Member]
Schedule of Share based Compensation, Shares Outstanding under Stock Option Plans, by Exercise Price Range [Abstract]
Range of exercise price, minimum (in dollars per share)	$ 12.39
Range of exercise price, maximum (in dollars per share)	$ 14.45
Number outstanding (in shares)					353
Weighted average remaining contractual life	1 year 9 months 18 days
Weighted average exercise price (in dollars per share)	$ 13.86
Number exercisable (in shares)	337
Weighted average exercise price (in dollars per share)	$ 13.90
14.45-16.52 [Member]
Schedule of Share based Compensation, Shares Outstanding under Stock Option Plans, by Exercise Price Range [Abstract]
Range of exercise price, minimum (in dollars per share)	$ 14.45
Range of exercise price, maximum (in dollars per share)	$ 16.52
Number outstanding (in shares)					165
Weighted average remaining contractual life	5 years 2 months 12 days
Weighted average exercise price (in dollars per share)	$ 15.82
Number exercisable (in shares)	147
Weighted average exercise price (in dollars per share)	$ 15.90
16.52-18.58 [Member]
Schedule of Share based Compensation, Shares Outstanding under Stock Option Plans, by Exercise Price Range [Abstract]
Range of exercise price, minimum (in dollars per share)	$ 16.52
Range of exercise price, maximum (in dollars per share)	$ 18.58
Number outstanding (in shares)					213
Weighted average remaining contractual life	4 years 3 months 18 days
Weighted average exercise price (in dollars per share)	$ 18.09
Number exercisable (in shares)	194
Weighted average exercise price (in dollars per share)	$ 18.08
18.58-20.65 [Member]
Schedule of Share based Compensation, Shares Outstanding under Stock Option Plans, by Exercise Price Range [Abstract]
Range of exercise price, minimum (in dollars per share)	$ 18.58
Range of exercise price, maximum (in dollars per share)	$ 20.65
Number outstanding (in shares)					361
Weighted average remaining contractual life	2 years
Weighted average exercise price (in dollars per share)	$ 18.93
Number exercisable (in shares)	352
Weighted average exercise price (in dollars per share)	$ 18.93
20.65-21.08 [Member]
Schedule of Share based Compensation, Shares Outstanding under Stock Option Plans, by Exercise Price Range [Abstract]
Range of exercise price, minimum (in dollars per share)	$ 20.65
Range of exercise price, maximum (in dollars per share)	$ 21.08
Number outstanding (in shares)					15
Weighted average remaining contractual life	5 years 9 months 18 days
Weighted average exercise price (in dollars per share)	$ 21.04
Number exercisable (in shares)	15
Weighted average exercise price (in dollars per share)	$ 21.04
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense relating to outstanding share based award type	692	780	888
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense relating to outstanding share based award type	952	2,349	1,210
Aggregate Intrinsic Value [Abstract]
Unrecognized compensation cost related to nonvested options and restricted shares outstanding	1,699	1,438	1,984
Weighted average period over which cost is expected to be recognized	1 year 10 months 24 days
Number of Shares [Roll Forward]
Nonvested, Beginning Balance (in shares)	356	343	276
Granted (in shares)	145	149	126
Vested (in shares)	(81)	(136)	(59)
Forfeited (in shares)	(30)
Nonvested, Ending Balance (in shares)	390	356	343
Weighted Average Grant Date Fair Value Per Share [Roll Forward]
Nonvested, Beginning Balance (in dollars per share)	$ 13.72	$ 11.86	$ 10.90
Granted (in dollars per share)	$ 11.15	$ 11.84	$ 15.86
Vested (in dollars per share)	$ 13.88	$ 6.94	$ 15.90
Forfeited (in dollars per share)	$ 13.00
Nonvested, Ending Balance (in dollars per share)	$ 12.81	$ 13.72	$ 11.86
All stock option plans [Member]
Assumptions used to estimate fair value of options granted [Abstract]
Expected stock price volatility, minimum (in hundredths)	54.61%	53.52%	48.80%
Expected stock price volatility, maximum (in hundredths)	56.36%	57.19%	53.21%
Risk-free interest rate range, minimum (in hundredths)	1.26%	1.24%	1.33%
Risk-free interest rate range, maximum (in hundredths)	1.68%	1.33%	2.84%
Total fair value of options granted	$ 908	$ 727	$ 995
2006 Long-Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of common stock available for issuance (in shares)	1,377
Weighted Average Remaining Term [Abstract]
Vested at December 31, 2013	3 years
Exercisable at December 31, 2013	10 years
2006 Long-Term Incentive Plan [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued in period (in shares)	176	130	111
2006 Long-Term Incentive Plan [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued in period (in shares)	145	149	126
Weighted Average Remaining Term [Abstract]
Vested at December 31, 2013	3 years
2003 Equity Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of common stock available for issuance (in shares)	6,452				6,452
Outside Directors Stock Option Plan [Member]
Weighted Average Remaining Term [Abstract]
Vested at December 31, 2013	2 years
Exercisable at December 31, 2013	10 years
Outside Directors Stock Option Plan [Member] | Stock Options [Member] | Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued in period (in shares)	15	17	15
Outside Directors Stock Option Plan [Member] | All stock option plans [Member]
Assumptions used to estimate fair value of options granted [Abstract]
Expected dividend yield (in hundredths)		2.73%
Minimum [Member] | All stock option plans [Member]
Assumptions used to estimate fair value of options granted [Abstract]
Expected dividend yield (in hundredths)	2.78%		1.57%
Weighted-average expected life of options	6 years 5 months 19 days	6 years 2 months 16 days	6 years 3 months 11 days
Forfeiture rate (in hundredths)	1.00%	1.00%	1.00%
Maximum [Member] | All stock option plans [Member]
Assumptions used to estimate fair value of options granted [Abstract]
Expected dividend yield (in hundredths)	2.84%		2.66%
Weighted-average expected life of options	7 years 7 months 2 days	7 years 8 months 12 days	7 years 7 months 17 days
Forfeiture rate (in hundredths)	2.50%	3.00%	3.00%