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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Operating revenue: |  |  |  |
Operating revenues | $ 155,152 | $ 158,731 | $ 472,909 | $ 469,370
Operating expenses: |  |  |  |
Selling, general and administrative | 27,178 | 27,452 | 83,070 | 86,117
Depreciation and amortization | 36,626 | 40,028 | 120,158 | 124,632
Total operating expenses | 129,793 | 130,402 | 398,743 | 403,118
Operating income | 25,359 | 28,329 | 74,166 | 66,252
Other income (expense): |  |  |  |
Interest expense | (7,505) | (9,001) | (22,981) | (27,184)
Other | 1,099 | 1,054 | 3,562 | 2,882
Income before income taxes | 18,953 | 20,382 | 54,747 | 41,950
Income tax expense | 4,599 | 4,848 | 13,333 | 10,207
Net income | 14,354 | 15,534 | 41,414 | 31,743
Other comprehensive income (loss): |  |  |  |
Unrealized gain (loss) on interest rate hedge, net of tax | (1,494) |  | (8,434) |
Unrealized gain (loss) on interest rate hedge, net of tax |  | 465 |  | 4,360
Comprehensive income | $ 12,860 | $ 15,999 | $ 32,980 | $ 36,103
Net income per share, basic and diluted: |  |  |  |
Basic net income per share (in dollars per share) | $ 0.29 | $ 0.31 | $ 0.83 | $ 0.64
Diluted net income per share (in dollars per share) | $ 0.29 | $ 0.31 | $ 0.83 | $ 0.63
Weighted average shares outstanding, basic (in shares) | 49,857 | 49,559 | 49,827 | 49,527
Weighted average shares outstanding, diluted (in shares) | 50,129 | 50,117 | 50,110 | 50,044
Service revenue and other |  |  |  |
Operating revenue: |  |  |  |
Operating revenues | $ 138,832 | $ 142,768 | $ 424,122 | $ 419,819
Equipment revenue |  |  |  |
Operating revenue: |  |  |  |
Operating revenues | 16,320 | 15,963 | 48,787 | 49,551
Cost of services |  |  |  |
Operating expenses: |  |  |  |
Cost of services | 50,164 | 47,886 | 149,179 | 146,362
Cost of goods sold |  |  |  |
Operating expenses: |  |  |  |
Cost of services | $ 15,825 | $ 15,036 | $ 46,336 | $ 46,007

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Data Type: | na
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