Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended						12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013	Jun. 30, 2013	Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Computation of basic and diluted earnings per common share [Abstract]
Income (loss) from continuing operations	$ 5,756	[1]	$ 3,536	$ 2,604	$ (2,295)	$ (1,583)	$ 13,218	$ (23,618)	$ 19,412
Income (loss) from discontinued operations	(85)	[1]	(3)	(6,738)	82	87	(6,693)	202	1,199
Net income (loss)	$ 5,671	[1]	$ 3,533	$ (4,134)	$ (2,213)	$ (1,496)	$ 6,525	$ (23,416)	$ 20,611
Weighted average shares - Basic (in shares)							26,286	25,924	25,790
Effect of dilutive stock options (in shares)							68	0	290
Weighted average shares-Diluted (in shares)							26,354	25,924	26,080
Basic [Abstract]
Income (loss) from continuing operations (in dollars per share)	$ 0.22	[1]	$ 0.13	$ 0.10	$ (0.09)	$ (0.06)	$ 0.50	$ (0.91)	$ 0.75
Income (loss) from discontinued operations (in dollars per share)	$ 0	[1]	$ 0	$ (0.26)	$ 0	$ 0	$ (0.25)	$ 0.01	$ 0.05
Net loss per common share (in dollars per share)	$ 0.22	[1]	$ 0.13	$ (0.16)	$ (0.09)	$ (0.06)	$ 0.25	$ (0.90)	$ 0.80
Diluted [Abstract]
Income (loss) from continuing operations (in dollars per share)	$ 0.22	[1]	$ 0.13	$ 0.10	$ (0.09)	$ (0.06)	$ 0.50	$ (0.91)	$ 0.74
Income (loss) from discontinued operations (in dollars per share)	$ (0.01)	[1]	$ 0	$ (0.26)	$ 0	$ 0	$ (0.25)	$ 0.01	$ 0.05
Net income (loss) per common share (in dollars per share)	$ 0.21	[1]	$ 0.13	$ (0.16)	$ (0.09)	$ (0.06)	$ 0.25	$ (0.90)	$ 0.79
Potentially dilutive outstanding stock options excluded from the computation of diluted earnings per share [Abstract]
Anti-dilutive options (in shares)							121
Stock Options [Member]
Potentially dilutive outstanding stock options excluded from the computation of diluted earnings per share [Abstract]
Anti-dilutive options (in shares)							1,356	1,530	782
Range of exercise price, minimum (in dollars per share)							$ 10.02	$ 11.71	$ 12.02
Range of exercise price, maximum (in dollars per share)							$ 21.08	$ 21.08	$ 21.08
Date of last option expiration							Dec. 16, 2023	Dec. 19, 2022	Aug. 17, 2021

[1] Results for the fourth quarter of 2013 were favorably impacted by a credit to income of approximately $518 for the reversal of a liability recorded in purchase accounting for a recent acquisition that is no longer needed due to statute expiration in the current quarter, and a credit to income of approximately $425 for net reserve reductions at certain of the Company’s vacant leased properties, for which a change in circumstances in the current quarter required a revision in the estimate of future expenses related to the leases. In addition, results for the current quarter were favorably impacted by a credit to income of approximately $736 for the correction of an error in the valuation of unbilled services that was immaterial to all prior periods presented.