Restatement (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Other income and expense:
Operating Income (Loss)	$ 4,557	$ 6,342	$ 14,296	$ 16,010
Interest and other income	3	26	37	50
Interest expense	1,625	2,880	4,635	5,199
Total other (expense)	(1,622)	(2,854)	(4,598)	(5,149)
Income before income taxes	2,935	3,488	9,698	10,861
Income tax provision (benefit)	1,194	1,355	3,925	4,034
Net income	1,741	2,133	5,773	6,827
Other comprehensive income, net of taxes	119	64	(345)	195
Total comprehensive income	1,860	2,197	5,428	7,022
Basic earnings per share	$ 0.13	$ 0.16	$ 0.43	$ 0.51
Diluted earnings per share	$ 0.13	$ 0.16	$ 0.43	$ 0.51
Shareholders' equity:
Common stock	1,353		1,353		1,340
Additional paid-in capital	16,661		16,661		15,683
Retained earnings	30,424		30,424		30,309
Accumulated other comprehensive (loss)	(4,480)		(4,480)		(4,135)
Total shareholders' equity	43,958		43,958		43,197
Scenario Previously Reported [Member]
Other income and expense:
Operating Income (Loss)		6,342		16,010
Interest and other income		26		50
Interest expense		(1,487)		(3,570)
Total other (expense)		(1,461)		(3,520)
Income before income taxes		4,881		12,490
Income tax provision		1,910		4,683
Net income		2,971		7,807
Other comprehensive income, net of taxes		(774)		(785)
Total comprehensive income		2,197		7,022
Basic earnings per share		$ 0.22		$ 0.58
Diluted earnings per share		$ 0.22		$ 0.58
Shareholders' equity:
Common stock					1,340
Additional paid-in capital					15,683
Retained earnings					31,797
Accumulated other comprehensive (loss)					(5,623)
Total shareholders' equity					43,197
Restatement Adjustment [Member]
Other income and expense:
Operating Income (Loss)		0		0
Interest and other income		0		0
Interest expense		(1,393)		(1,629)
Total other (expense)		(1,393)		(1,629)
Income before income taxes		(1,393)		(1,629)
Income tax provision		(555)		(649)
Net income		(838)		(980)
Other comprehensive income, net of taxes		838		980
Total comprehensive income		0		0
Basic earnings per share		$ (0.06)		$ (0.07)
Diluted earnings per share		$ (0.06)		$ (0.07)
Shareholders' equity:
Common stock					0
Additional paid-in capital					0
Retained earnings					(1,488)
Accumulated other comprehensive (loss)					1,488
Total shareholders' equity					$ 0