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CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Operating revenue: |  |  |
Total operating revenue | $ 630,854 | $ 611,991 | $ 535,288
Operating expenses |  |  |
Selling, general and administrative | 113,222 | 165,937 | 133,325
Acquisition, integration and migration expenses | 0 | 11,030 | 42,232
Depreciation and amortization | 166,405 | 177,007 | 143,685
Total operating expenses | 537,608 | 565,481 | 512,762
Operating income (loss) | 93,246 | 46,510 | 22,526
Other income (expense): |  |  |
Interest expense | (34,847) | (38,237) | (25,102)
Gain (loss) on investments, net | (275) | 564 | 271
Non-operating income (loss), net | 3,988 | 4,420 | 4,250
Income (loss) before income taxes | 62,112 | 13,257 | 1,945
Income tax (benefit) expense | 15,517 | (53,133) | 2,840
Net income (loss) | 46,595 | 66,390 | (895)
Other comprehensive income (loss): |  |  |
Unrealized gain (loss) on interest rate hedge, net of tax | 50 | 1,442 | 6,373
Comprehensive income (loss) | $ 46,645 | $ 67,832 | $ 5,478
Net income (loss) per share, basic and diluted: |  |  |
Basic net income (loss) per share (in dollars per share) | $ 0.94 | $ 1.35 | $ (0.02)
Diluted net income (loss) per share (in dollars per share) | $ 0.93 | $ 1.33 | $ (0.02)
Weighted average shares outstanding, basic (in shares) | 49,542 | 49,150 | 48,807
Weighted average shares outstanding, diluted (in shares) | 50,063 | 50,026 | 48,807
Cash dividend declared per share (in dollars per share) | $ 0.27 | $ 0.26 | $ 0.25
Service revenue and other |  |  |
Operating revenue: |  |  |
Total operating revenue | $ 562,456 | $ 601,673 | $ 523,748
Equipment revenue |  |  |
Operating revenue: |  |  |
Total operating revenue | 68,398 | 10,318 | 11,540
Cost of services |  |  |
Operating expenses |  |  |
Cost of services and cost of goods sold | 194,022 | 188,721 | 163,969
Cost of goods sold |  |  |
Operating expenses |  |  |
Cost of services and cost of goods sold | $ 63,959 | $ 22,786 | $ 29,551

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