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Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Income Statement [Abstract] |  |  |  |
Revenue | $ 3,342,215 | $ 3,207,537 | $ 6,323,419 | $ 6,054,271
Costs and expenses: |  |  |  |
Cost of services | 2,318,562 | 2,254,233 | 4,405,641 | 4,267,846
Operating, administrative and other | 712,374 | 680,442 | 1,318,605 | 1,323,808
Depreciation and amortization | 100,386 | 90,268 | 194,423 | 177,262
Total costs and expenses | 3,131,322 | 3,024,943 | 5,918,669 | 5,768,916
Gain on disposition of real estate | 11,298 |  | 12,683 | 4,819
Operating income | 222,191 | 182,594 | 417,433 | 290,174
Equity income from unconsolidated subsidiaries | 75,384 | 34,929 | 90,402 | 92,230
Other income | 3,186 | 3,882 | 7,301 | 7,097
Interest income | 1,427 | 3,066 | 3,838 | 4,525
Interest expense | 35,430 | 36,987 | 69,440 | 71,777
Income before provision for income taxes | 266,758 | 187,484 | 449,534 | 322,249
Provision for income taxes | 68,362 | 64,039 | 119,635 | 114,164
Net income | 198,396 | 123,445 | 329,899 | 208,085
Less: Net income attributable to non- controlling interests | 1,231 | 1,777 | 3,137 | 4,250
Net income attributable to CBRE Group, Inc. | $ 197,165 | $ 121,668 | $ 326,762 | $ 203,835
Basic income per share: |  |  |  |
Net income per share attributable to CBRE Group, Inc. | $ 0.59 | $ 0.36 | $ 0.97 | $ 0.61
Weighted average shares outstanding for basic income per share | 336,975,149 | 335,076,746 | 336,941,681 | 334,534,841
Diluted income per share: |  |  |  |
Net income per share attributable to CBRE Group, Inc. | $ 0.58 | $ 0.36 | $ 0.96 | $ 0.60
Weighted average shares outstanding for diluted income per share | 340,882,603 | 338,080,641 | 340,214,246 | 337,797,887

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