CONSOLIDATED STATEMENTS OF COMMON SHAREHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Retained Deficit [Member]	Total
Balance at Dec. 31, 2011	$ 94	$ 135,091	$ (356)	$ (30,320)	$ 104,509
Balance (in shares) at Dec. 31, 2011	18,845,000
Increase (Decrease) in Shareholders' Equity [Roll Forward]
Issuance of shares under stock plans	0	13	0	0	13
Issuance of shares under stock plans (in shares)	6,000
Stock-based compensation	0	547	0	0	547
Stock-based compensation (in shares)	23,000
Tax benefit related to stock options	0	379	0	0	379
Unrealized gains on derivative financial instruments, net of tax provision (benefit)	0	0	221	0	221
Tax payments related to performance shares issued					0
Net income	0	0	0	2,526	2,526
Balance at Dec. 31, 2012	94	136,030	(135)	(27,794)	108,195
Balance (in shares) at Dec. 31, 2012	18,874,000
Increase (Decrease) in Shareholders' Equity [Roll Forward]
Issuance of shares under stock plans	1	243	0	0	244
Issuance of shares under stock plans (in shares)	75,000
Stock-based compensation	0	549	0	0	549
Stock-based compensation (in shares)	23,000
Tax benefit related to stock options	0	150	0	0	150
Unrealized gains on derivative financial instruments, net of tax provision (benefit)	0	0	135	0	135
Tax payments related to performance shares issued					0
Net income	0	0	0	1,959	1,959
Balance at Dec. 31, 2013	95	136,972	0	(25,835)	111,232
Balance (in shares) at Dec. 31, 2013	18,972,000				18,972,247
Increase (Decrease) in Shareholders' Equity [Roll Forward]
Issuance of shares under stock plans	1	487	0	0	488
Issuance of shares under stock plans (in shares)	105,000
Stock-based compensation	0	784	0	0	784
Stock-based compensation (in shares)	38,000
Tax benefit related to stock options	0	298	0	0	298
Unrealized gains on derivative financial instruments, net of tax provision (benefit)	0	0	(312)	0	(312)
Tax payments related to performance shares issued	0	(150)	0	0	(150)
Net income	0	0	0	3,077	3,077
Balance at Dec. 31, 2014	$ 96	$ 138,391	$ (312)	$ (22,758)	$ 115,417
Balance (in shares) at Dec. 31, 2014	19,115,000				19,115,396