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Consolidated Statements of Operations - USD ($) shares in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Statement [Abstract] |  |  |
Revenues | $ 9,466,478,000 | $ 7,651,319,000 | $ 7,572,436,000
Cost of services (including depreciation) | 8,224,618,000 | 6,637,519,000 | 6,648,771,000
Gross profit | 1,241,860,000 | 1,013,800,000 | 923,665,000
Selling, general and administrative expenses | 777,920,000 | 653,338,000 | 592,863,000
Amortization of intangible assets | 32,205,000 | 31,685,000 | 34,848,000
Asset impairment charges | 58,057,000 | 7,964,000 | 58,451,000
Change in fair value of contingent consideration liabilities | (5,171,000) | 0 | 0
Operating income | 378,849,000 | 320,813,000 | 237,503,000
Interest expense | (20,946,000) | (14,887,000) | (8,024,000)
Interest income | 832,000 | 2,423,000 | 1,493,000
Other income (expense), net | (4,978,000) | (663,000) | (2,297,000)
Income from continuing operations before income taxes | 353,757,000 | 307,686,000 | 228,675,000
Provision for income taxes | 35,532,000 | 107,246,000 | 97,472,000
Net income from continuing operations | 318,225,000 | 200,440,000 | 131,203,000
Net income (loss) from discontinued operations | 0 | (342,000) | 190,621,000
Net income | 318,225,000 | 200,098,000 | 321,824,000
Less: Net income attributable to non-controlling interests | 3,247,000 | 1,715,000 | 10,917,000
Net income attributable to common stock | 314,978,000 | 198,383,000 | 310,907,000
Amounts attributable to common stock: |  |  |
Net income from continuing operations | 314,978,000 | 198,725,000 | 120,286,000
Net income (loss) from discontinued operations | 0 | (342,000) | 190,621,000
Net income attributable to common stock | $ 314,978,000 | $ 198,383,000 | $ 310,907,000
Basic earnings per share attributable to common stock: |  |  |
Continuing operations (in usd per share) | $ 2.02 | $ 1.26 | $ 0.62
Discontinued operations (in usd per share) | 0.00 | 0.00 | 0.97
Net income attributable to common stock (in usd per share) | $ 2.02 | $ 1.26 | $ 1.59
Weighted average basic shares outstanding (in shares) | 156,124 | 157,287 | 195,113
Diluted earnings per share attributable to common stock: |  |  |
Continuing operations (in usd per share) | $ 2.00 | $ 1.26 | $ 0.62
Discontinued operations (in usd per share) | 0.00 | 0.00 | 0.97
Net income attributable to common stock (in usd per share) | $ 2.00 | $ 1.26 | $ 1.59
Weighted average diluted shares outstanding (in shares) | 157,155 | 157,288 | 195,120

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