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Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2018
Accounting Policies [Abstract] |
Disaggregated Revenue | We have one operating segment and no single customer exceeds 5% of our revenue. The composition of our revenue is summarized below:
|  | Year Ended December 31, |
(In thousands) |  | 2018 |  |  | 2017 |  |  | 2016 |
LTL services |  | $ | 3,982,658 |  |  | $ | 3,303,611 |  |  | $ | 2,939,572 |
Other services |  |  | 61,037 |  |  |  | 54,501 |  |  |  | 51,945 |
Total revenue |  | $ | 4,043,695 |  |  | $ | 3,358,112 |  |  | $ | 2,991,517 |
Estimated Useful Lives of Property and Equipment | Depreciation of property and equipment is calculated using the straight-line method over the estimated useful lives of the related assets. The following table provides the estimated useful lives by asset type:
Structures |  | 7 to 30 years
Revenue equipment |  | 4 to 15 years
Other equipment |  | 2 to 20 years
Leasehold improvements |  | Lesser of economic life or life of lease

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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://fasb.org/us-gaap/role/ref/legacyRef -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 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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