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OPERATING LEASES AND COMMITMENTS (Future minimum commitments) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Operating Leases and Commitments |  |  |
Rental expense | $ 27,300 | $ 31,700 | $ 26,700
Future minimum rental commitments for all noncancelable operating leases |  |  |
2019 | 19,130 |  |
2020 | 14,620 |  |
2021 | 10,972 |  |
2022 | 7,125 |  |
2023 | 4,477 |  |
Thereafter | 5,850 |  |
Total | 62,174 |  |
Land and structures (service centers) |  |  |
Future minimum rental commitments for all noncancelable operating leases |  |  |
2019 | 18,067 |  |
2020 | 13,676 |  |
2021 | 10,716 |  |
2022 | 7,125 |  |
2023 | 4,477 |  |
Thereafter | 5,850 |  |
Total | 59,911 |  |
Future minimum payments for leases not yet commenced | 21,000 |  |
Equipment and other |  |  |
Future minimum rental commitments for all noncancelable operating leases |  |  |
2019 | 1,063 |  |
2020 | 944 |  |
2021 | 256 |  |
Total | $ 2,263 |  |

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- Definition Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 + Details
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