Earnings Per Common Share Computations (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share [Abstract]
Earnings from continuing operations	$ 3,531	$ 9,208	$ 60,164	$ 60,606
Participating Securities, Distributed and Undistributed Earnings (Loss), Basic	37	193	623	1,281
Numerator for basic earnings from continuing operations per common share	3,494	9,015	59,541	59,325
Net earnings and comprehensive income	3,531	9,249	60,164	60,605
Net earnings allocated to participating securities	(37)	(195)	(623)	(1,281)
Numerator for basic net earnings per common share	3,494	9,054	59,541	59,324
Income Loss From Continuing Operations, Diluted	3,531	9,208	60,164	60,606
Net Income (Loss) Available to Common Stockholders, Diluted	$ 3,531	$ 9,249	$ 60,164	$ 60,605
Earnings Per Share, Basic and Diluted [Abstract]
Basic (in shares)	17,020	17,328	17,322	17,269
Plus dilutive effect of stock options (in shares)	102	254	167	239
Plus dilutive effect of participating securities (in shares)	181	373	181	373
Diluted (in shares)	17,303	17,955	17,670	17,881
Net earnings (in dollars per share), Basic	$ 0.21	$ 0.52	$ 3.44	$ 3.44
Income (Loss) from Continuing Operations, Per Diluted Share	$ 0.20	$ 0.51	$ 3.40	$ 3.39
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share	$ 0.00	$ 0.01	$ 0.00	$ 0.00
Net earnings (in dollars per share), Diluted	$ 0.20	$ 0.52	$ 3.40	$ 3.39