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Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Income Statement [Abstract] |  |  |  |
Revenues | $ 144,670 | $ 143,714 | $ 270,103 | $ 260,292
Operating expenses: |  |  |  |
Cost of operations | 95,188 | 98,737 | 185,606 | 186,569
General and administration | 18,084 | 18,071 | 36,672 | 34,876
Depreciation and amortization | 15,802 | 16,241 | 30,255 | 29,990
Divestiture transactions |  | (677) |  | (5,611)
Total operating expenses | 129,074 | 132,372 | 252,533 | 245,824
Operating income | 15,596 | 11,342 | 17,570 | 14,468
Other expense (income): |  |  |  |
Interest income | (60) | (70) | (164) | (211)
Interest expense | 10,004 | 10,150 | 20,034 | 20,276
Loss on debt extinguishment | 593 |  | 545 | 521
Loss on derivative instruments |  | 47 |  | 198
Other income | (363) | (46) | (504) | (209)
Other expense, net | 10,174 | 10,081 | 19,911 | 20,575
Income (loss) before income taxes | 5,422 | 1,261 | (2,341) | (6,107)
Provision for income taxes | 230 | 318 | 81 | 914
Net income (loss) | 5,192 | 943 | (2,422) | (7,021)
Less: Net (loss) income attributable to noncontrolling interests | (3) | (82) | (9) | 1,226
Net income (loss) attributable to common stockholders | $ 5,195 | $ 1,025 | $ (2,413) | $ (8,247)
Basic earnings per share attributable to common stockholders: |  |  |  |
Weighted average common shares outstanding | 41,132 | 40,447 | 41,064 | 40,432
Basic earnings per share | $ 0.13 | $ 0.03 | $ (0.06) | $ (0.20)
Diluted earnings per share attributable to common stockholders: |  |  |  |
Weighted average common shares outstanding | 41,598 | 40,846 | 41,064 | 40,432
Diluted earnings per share | $ 0.12 | $ 0.03 | $ (0.06) | $ (0.20)

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