Note 1 - Basis of Presentation - Property and Equipment (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2017	Dec. 31, 2016
Property and equipment, gross	$ 711,498	$ 655,487
Accumulated depreciation	(359,537)	(329,394)
Total property and equipment, net	351,961	326,093
Land [Member]
Property and equipment, gross	49,651	44,611
Building and Building Improvements [Member]
Property and equipment, gross	$ 154,391	139,078
Building and Building Improvements [Member] \| Minimum [Member]
Estimated useful lives (Year)	7 years
Building and Building Improvements [Member] \| Maximum [Member]
Estimated useful lives (Year)	40 years
Equipment [Member]
Property and equipment, gross	$ 507,456	$ 471,798
Equipment [Member] \| Minimum [Member]
Estimated useful lives (Year)	3 years
Equipment [Member] \| Maximum [Member]
Estimated useful lives (Year)	20 years

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Section S99
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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Subparagraph (SX 210.5-02(13))
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
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-Section S99
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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

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