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Construction Joint Ventures (Tables) | 12 Months Ended
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Dec. 31, 2017
Equity Method Investments and Joint Ventures [Abstract] |
Change in Non-controlling Interest | The following table summarizes the changes in the noncontrolling owners’ interests in subsidiaries and consolidated joint ventures for the years ended December 31, 2017, 2016 and 2015 (amounts in thousands):
| Years Ended December 31,
| 2017 |  | 2016 |  | 2015
Balance, beginning of period | $ | 656 |  |  | $ | (91 | ) |  | $ | 7,462 |
Net income attributable to noncontrolling interest included in equity | 4,200 |  |  | 1,826 |  |  | 3,216 |
Change due to amendment | — |  |  | — |  |  | (7,367 | )
Distributions to noncontrolling interest owners | — |  |  | (1,079 | ) |  | (3,402 | )
Balance, end of period | $ | 4,856 |  |  | $ | 656 |  |  | $ | (91 | )
Condensed Balance Sheet | Combined financial amounts of joint ventures in which the Company has a noncontrolling interest and the Company’s share of such amounts which are included in the Company’s consolidated financial statements are shown below (amounts in thousands):
| As of December 31,
| 2017 |  | 2016
Total combined: |  |  |  |  |
Current assets | $ | 64,574 |  |  | $ | 32,592 |
Less current liabilities | $ | (78,349 | ) |  | (57,598 | )
Net liabilities | $ | (13,775 | ) |  | $ | (25,006 | )
Backlog | $ | 112,512 |  |  | $ | 107,333 |
Sterling’s noncontrolling interest in backlog | 55,096 |  |  | 52,992 |
Sterling’s receivables from and equity in construction joint ventures | 11,380 |  |  | 7,130 |
Condensed Income Statement |
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Revenues | $ | 181,589 |  |  | $ | 156,202 |  |  | $ | 175,691 |
Operating income | 9,069 |  |  | 6,005 |  |  | 7,371 |
Net income attributable to Sterling common stockholders | 4,531 |  |  | 2,993 |  |  | 3,681 |
| Years Ended December 31,
| 2017 |  | 2016 |  | 2015
Total combined: |  |  |  |  |
Revenues | $ | 93,848 |  |  | $ | 62,440 |  |  | $ | 60,289 |
Income before tax | 7,827 |  |  | 5,144 |  |  | 6,909 |
Sterling’s noncontrolling interest: |  |  |  |  |
Revenues | $ | 44,948 |  |  | $ | 25,537 |  |  | $ | 23,778 |
Income before tax | 3,847 |  |  | 1,980 |  |  | 2,502 |

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- Definition The tabular disclosure of the effects of any changes in a parent's ownership interest in a subsidiary on the equity attributable to the parent if the ownership interests in a subsidiary changes during the period. The changes represented by this element did not result in the deconsolidation of the subsidiary. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4M -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591554-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 + Details
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