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Note 1 - Basis of Presentation (Tables) | 3 Months Ended
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Mar. 31, 2015
Disclosure Text Block [Abstract] |
Schedule of Weighted Average Number of Shares [Table Text Block] |
|  | Three Months Ended |
|  | March 31, |
|  | 2015 |  |  | 2014 |
Weighted-average shares outstanding-basic |  |  | 58,224 |  |  |  | 57,847 |
Common stock equivalents for stock options and restricted stock |  |  | 513 |  |  |  | 439 |
Weighted-average shares outstanding-diluted |  |  | 58,737 |  |  |  | 58,286 |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
|  | March 31, |  |  | December 31, |
|  | 2015 |  |  | 2014 |
Accumulated balances of items included in accumulated other comprehensive loss: |  |  |  |  |  |  |  |
Increase in pension liability |  | $ | (34,117 | ) |  | $ | (34,117 | )
Income tax benefit |  |  | (13,305 | ) |  |  | (13,305 | )
Accumulated other comprehensive loss |  | $ | (20,812 | ) |  | $ | (20,812 | )
Property, Plant and Equipment [Table Text Block] |
|  | March 31, |  |  | December 31, |  |  | Estimated Useful Lives |
|  | 2015 |  |  | 2014 |  |  | (in years) |
Property and equipment: |  |  |  |  |  |  |  |  |  |  |  |
Land |  | $ | 32,114 |  |  | $ | 32,085 |  |  |  |  |
Buildings and improvements |  |  | 77,780 |  |  |  | 77,477 |  |  |  | 7 to 40 |
Equipment |  |  | 394,590 |  |  |  | 394,569 |  |  |  | 3 to 20 |
|  |  | 504,484 |  |  |  | 504,131 |  |  |  |  |
Accumulated depreciation |  |  | (290,690 | ) |  |  | (282,320 | ) |  |  |  |
Total property and equipment, net |  | $ | 213,794 |  |  | $ | 221,811 |  |  |  |  |

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph b -Article 5 + Details
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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 + Details
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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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