Note 1 - Basis of Presentation (Tables)

9 Months Ended

Sep. 30, 2017

Notes Tables

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

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2017		2016		2017		2016
Weighted-average shares outstanding-basic		71,636		71,879		71,777		71,850
Common stock equivalents for stock options and restricted stock		818		-		714		873
Weighted-average shares outstanding-diluted		72,454		71,879		72,491		72,723

Property, Plant and Equipment [Table Text Block]

							Estimated
	September 30,			December 31,			Useful Lives
	2017			2016			(in years)
Property and equipment:
Land	$	49,651		$	44,611
Buildings and improvements		154,391			139,078		7	to	40
Equipment		507,456			471,798		3	to	20
		711,498			655,487
Accumulated depreciation		(359,537	)		(329,394	)
Total property and equipment, net	$	351,961		$	326,093