Schedule of Segment Reporting Information, by Segment [Table Text Block] |
| | | | | | | | | | | | | | | | | | | | | | (unaudited) | | | | (in thousands) | | Sales to External Customers: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | $ | 42,834 | | | $ | 41,099 | | | $ | 81,533 | | | $ | 81,817 | | | | | 10,971 | | | | 11,072 | | | | 19,286 | | | | 19,273 | | | | | 13,697 | | | | 14,622 | | | | 27,633 | | | | 27,589 | | | | | 7,178 | | | | 5,044 | | | | 13,324 | | | | 10,202 | | | | | 70,424 | | | | 70,791 | | | | 147,025 | | | | 145,222 | | | | | 3,619 | | | | 2,634 | | | | 6,674 | | | | 4,720 | | | | $ | 148,723 | | | $ | 145,262 | | | $ | 295,475 | | | $ | 288,823 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | $ | 9,735 | | | $ | 10,829 | | | $ | 18,475 | | | $ | 20,029 | | | | | 12,907 | | | | 13,722 | | | | 21,971 | | | | 22,877 | | | | | 3,433 | | | | 4,569 | | | | 7,308 | | | | 9,448 | | | | | (511 | ) | | | (927 | ) | | | (1,085 | ) | | | (2,000 | ) | | | | 1,136 | | | | 340 | | | | 1,291 | | | | 566 | | | | $ | 26,700 | | | $ | 28,533 | | | $ | 47,960 | | | $ | 50,920 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | $ | 30,544 | | | $ | 28,778 | | | $ | 58,614 | | | $ | 54,288 | | Repair and maintenance service | | | 16,944 | | | | 15,723 | | | | 34,707 | | | | 31,033 | | | | | 6,237 | | | | 6,328 | | | | 14,969 | | | | 12,075 | | | | | 562 | | | | 384 | | | | 835 | | | | 621 | | | | $ | 54,287 | | | $ | 51,213 | | | $ | 109,125 | | | $ | 98,017 | | | | | | | | | | | | | | | | | | | | | $ | 229,710 | | | $ | 225,008 | | | $ | 452,560 | | | $ | 437,760 | | | | | | | | | | | | | | | | | | | Depreciation and Amortization: | | | | | | | | | | | | | | | | | | | $ | 5,684 | | | $ | 5,325 | | | $ | 11,069 | | | $ | 10,515 | | | | | 288 | | | | 250 | | | | 574 | | | | 566 | | | | | 4,073 | | | | 3,866 | | | | 8,027 | | | | 7,775 | | Total Depreciation and Amortization | | $ | 10,045 | | | $ | 9,441 | | | $ | 19,670 | | | $ | 18,856 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | $ | 18,520 | | | $ | 15,649 | | | $ | 34,422 | | | $ | 31,142 | | | | | 2,469 | | | | 2,535 | | | | 3,559 | | | | 3,201 | | | | | 2,290 | | | | 3,621 | | | | 3,658 | | | | 4,072 | | | | $ | 23,279 | | | $ | 21,805 | | | $ | 41,639 | | | $ | 38,415 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | $ | 5,425 | | | $ | 4,617 | | | $ | 13,509 | | | $ | 10,750 | | | | | 43 | | | $ | 39 | | | | 199 | | | | 62 | | | | | 4,963 | | | | 3,603 | | | | 10,027 | | | | 7,121 | | Total Capital Expenditures | | | 10,431 | | | | 8,259 | | | $ | 23,735 | | | $ | 17,933 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | $ | 545,344 | | | $ | 522,080 | | | $ | 545,344 | | | $ | 522,080 | | | | | 24,432 | | | | 25,145 | | | | 24,432 | | | | 25,145 | | | | | 175,331 | | | | 162,088 | | | | 175,331 | | | | 162,088 | | | | $ | 745,107 | | | $ | 709,313 | | | $ | 745,107 | | | $ | 709,313 | |
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