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Lease Accounting (Major Categories of Operating Lease Portfolio) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Operating Leased Assets [Line Items] |  |  |
Total Right of Use Assets, net | $ 200,788 | $ 208,929 | $ 0
Accrued liabilities, current | 31,560 | 33,016 |
Other long-term liabilities, non-current | 163,649 | 171,348 |
Total Lease Liability | 195,209 | 204,364 |
Transportation Equipment |  |  |
Operating Leased Assets [Line Items] |  |  |
Total Right of Use Assets, net | 113,384 | 117,727 |
Total Lease Liability | 116,889 |  |
Office Space & Equipment |  |  |
Operating Leased Assets [Line Items] |  |  |
Total Right of Use Assets, net | 13,316 | 14,194 |
Total Lease Liability | 13,354 |  |
Facilities and Equipment |  |  |
Operating Leased Assets [Line Items] |  |  |
Total Right of Use Assets, net | 74,088 | $ 77,008 |
Total Lease Liability | $ 64,966 |  |

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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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