Note 1 - Basis of Presentation (Tables)

9 Months Ended

Sep. 30, 2013

Disclosure Text Block [Abstract]

Schedule of Weighted Average Number of Shares [Table Text Block]

	Three Months Ended September 30,				Nine Months Ended September 30,
	2013		2012		2013		2012
Weighted-average shares outstanding - basic		57,713		57,155		57,600		57,151
Common stock equivalents attributable to stock options and restricted stock		365		132		307		58
Weighted-average shares outstanding - diluted		58,078		57,287		57,907		57,209

Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

	September 30, 2013			December 31, 2012
Accumulated balances of items included in accumulated other comprehensive loss:
Increase in pension liability	$	(33,065	)	$	(33,065	)
Income tax benefit		(12,895	)		(12,895	)
Accumulated other comprehensive loss	$	(20,170	)	$	(20,170	)

Property, Plant and Equipment [Table Text Block]

	September 30, 2013			December 31, 2012			Estimated Useful Lives (in years)
Property and equipment:
Land	$	24,614		$	24,383
Buildings and improvements		57,530			55,709		7	to	40
Equipment		322,262			313,761		3	to	20
		404,406			393,853
Accumulated depreciation		(269,137	)		(258,715	)
Total property and equipment, net	$	135,269		$	135,138