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Condensed Statements Of Operations - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Income Statement [Abstract] |  |  |  |
Revenue from operations | $ 1,033,498 | $ 839,912 | $ 1,958,518 | $ 1,594,008
Operating expenses: |  |  |  |
Salaries, wages and benefits | 522,249 | 441,904 | 1,023,560 | 858,408
Operating supplies and expenses | 124,919 | 88,580 | 238,980 | 179,567
General supplies and expenses | 29,891 | 28,283 | 59,867 | 51,155
Operating taxes and licenses | 28,165 | 24,961 | 54,953 | 48,983
Insurance and claims | 11,342 | 9,314 | 22,441 | 18,104
Communications and utilities | 7,439 | 7,022 | 14,485 | 14,455
Depreciation and amortization | 56,235 | 50,449 | 109,716 | 100,736
Purchased transportation | 26,044 | 20,860 | 47,784 | 38,857
Building and office equipment rents | 1,647 | 1,982 | 3,522 | 4,096
Miscellaneous expenses, net | 5,086 | 6,125 | 13,389 | 11,093
Total operating expenses | 813,017 | 679,480 | 1,588,697 | 1,325,454
Operating income | 220,481 | 160,432 | 369,821 | 268,554
Non-operating expense (income): |  |  |  |
Interest expense | 11 | 642 | 22 | 1,237
Interest income | (668) | (69) | (1,124) | (104)
Other (income) expense, net | (334) | (431) | 1,965 | (22)
Total non-operating (income) expense | (991) | 142 | 863 | 1,111
Income before income taxes | 221,472 | 160,290 | 368,958 | 267,443
Provision for income taxes | 58,038 | 61,872 | 96,191 | 103,233
Net income | $ 163,434 | $ 98,418 | $ 272,767 | $ 164,210
Earnings per share: |  |  |  |
Basic | $ 1.99 | $ 1.20 | $ 3.32 | $ 1.99
Diluted | 1.99 | 1.19 | 3.32 | 1.99
Dividends declared per share | $ 0.13 | $ 0.10 | $ 0.26 | $ 0.20
Weighted average shares outstanding: |  |  |  |
Basic | 82,067,872 | 82,318,623 | 82,160,159 | 82,333,739
Diluted | 82,169,552 | 82,427,975 | 82,262,285 | 82,436,170

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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109260490&loc=d3e1448-109256 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration