Note 1 - Basis of Presentation (Tables)

6 Months Ended

Jun. 30, 2016

Notes Tables

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

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2016		2015		2016		2015
Weighted-average shares outstanding-basic		71,878		71,637		71,835		64,968
Common stock equivalents for stock options and restricted shares		870		633		830		561
Weighted-average shares outstanding-diluted		72,748		72,270		72,665		65,529

Property, Plant and Equipment [Table Text Block]

							Estimated
	June 30,			December 31,			Useful Lives
	2016			2015			(in years)
Property and equipment:
Land	$	45,242		$	36,529
Buildings and improvements		126,185			85,626		7	to	40
Equipment		458,602			420,380		3	to	20
		630,029			542,535
Accumulated depreciation		(309,309	)		(308,060	)
Total property and equipment, net	$	320,720		$	234,475