Note 1 - Basis of Presentation (Tables)

9 Months Ended

Sep. 30, 2015

Notes Tables

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

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2015		2014		2015		2014
Weighted-average shares outstanding-basic		71,638		57,863		67,215		57,857
Common stock equivalents for stock options and restricted stock		703		531		609		473
Weighted-average shares outstanding-diluted		72,341		58,394		67,824		58,330

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

	September 30,			December 31,
	2015			2014
Accumulated balances of items included in accumulated other comprehensive loss:
Adjustment to pension liability	$	(21,830	)	$	(34,117	)
Income tax benefit		(8,512	)		(13,305	)
Accumulated other comprehensive loss	$	(13,318	)	$	(20,812	)

Property, Plant and Equipment [Table Text Block]

							Estimated
	September 30,			December 31,			Useful Lives
	2015			2014			(in years)
Property and equipment:
Land	$	34,749		$	32,085
Buildings and improvements		82,406			77,477		7	to	40
Equipment		416,024			394,569		3	to	20
		533,179			504,131
Accumulated depreciation		(303,795	)		(282,320	)
Total property and equipment, net	$	229,384		$	221,811