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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Revenue: |  |
Total revenue | $ 153,188 | $ 158,843
Operating expenses |  |
Selling, general and administrative | 30,991 | 28,722
Depreciation and amortization | 36,911 | 41,179
Total operating expenses | 130,138 | 134,056
Operating income | 23,050 | 24,787
Other income (expense): |  |
Interest expense | (6,211) | (7,954)
Other | 733 | 1,287
Income before income taxes | 17,572 | 18,120
Income tax expense | 4,292 | 4,210
Net income | 13,280 | 13,910
Other comprehensive income: |  |
Unrealized loss on interest rate hedge, net of tax | (6,106) | (2,728)
Comprehensive income | $ 7,174 | $ 11,182
Net income per share, basic and diluted: |  |
Basic net income per share (in dollars per share) | $ 0.27 | $ 0.28
Diluted net income per share (in dollars per share) | $ 0.27 | $ 0.28
Weighted average shares outstanding, basic (in shares) | 49,888 | 49,775
Weighted average shares outstanding, diluted (in shares) | 50,036 | 50,115
Service revenue and other |  |
Revenue: |  |
Total revenue | $ 140,188 | $ 143,231
Equipment revenue |  |
Revenue: |  |
Total revenue | 13,000 | 15,612
Services |  |
Operating expenses |  |
Cost of services and cost of goods sold | 49,565 | 49,518
Products |  |
Operating expenses |  |
Cost of services and cost of goods sold | $ 12,671 | $ 14,637

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