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Accounts Receivable, Net and Supplemental Balance Sheet Information (Tables)
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12 Months Ended |
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Dec. 31, 2014
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| Accounts Receivable, Net and Supplemental Balance Sheet Information [Abstract] |
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| Schedule of accounts receivable [Table Text Block] |
| | E. | Accounts Receivable, Net and Supplemental Balance Sheet Information |
Accounts receivable, net, consisted of the following: | | | | | | | | | | December 31, | | 2014 | | 2013 | Accounts receivable | $ | 98,657 |
| | $ | 93,156 |
| Receivables under contractual arrangements | 15,362 |
| | 14,309 |
| | 114,019 |
| | 107,465 |
| Less allowances for doubtful accounts | 2,421 |
| | 2,209 |
| | $ | 111,598 |
| | $ | 105,256 |
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| Schedule of other current assets [Table Text Block] |
The following items comprise the amounts included in the balance sheets: | | | | | | | | | | December 31, | Other current assets | 2014 | | 2013 | Refundable income taxes | $ | 2,122 |
| | $ | 5,317 |
| Deferred income taxes | 8,927 |
| | 7,715 |
| Note receivable | 4,319 |
| | — |
| Other | 759 |
| | 813 |
| Total | $ | 16,127 |
| | $ | 13,845 |
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| Schedule of other assets, noncurrent [Table Text Block] |
| | | | | | | | | | December 31, | Other assets, noncurrent | 2014 | | 2013 | Assets invested for self-insurance | $ | 13,684 |
| | $ | 12,716 |
| Investment--cost-method affiliate | 1,168 |
| | 1,168 |
| Deferred income taxes | 1,705 |
| | — |
| Other | 2,305 |
| | 3,033 |
| Total | $ | 18,862 |
| | $ | 16,917 |
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| Schedule of accrued liabilities [Table Text Block] |
| | | | | | | | | | December 31, | Accrued expenses | 2014 | | 2013 | Employee compensation | $ | 19,195 |
| | $ | 18,578 |
| Accrued compensated absences | 8,034 |
| | 6,953 |
| Self-insured medical claims | 2,722 |
| | 2,503 |
| Customer advances, deposits | 2,030 |
| | 2,191 |
| Taxes, other than income | 2,054 |
| | 5,730 |
| Other | 890 |
| | 903 |
| Total | $ | 34,925 |
| | $ | 36,858 |
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| Other liabilities, noncurrent [Table Text Block] |
| | | | | | | | | | December 31, | Other liabilities, noncurrent | 2014 | | 2013 | Pension and retirement plans | $ | 16,311 |
| | $ | 7,760 |
| Deferred income taxes | — |
| | 2,564 |
| Other | 2,657 |
| | 1,956 |
| Total | $ | 18,968 |
| | $ | 12,280 |
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