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v3.19.1

Condensed Consolidated Statements of Changes in Equity - USD ($) $ in Thousands | Total | Common Stock | Additional Paid in Capital | Retained Deficit | Treasury Stock | Total Sterling Stockholders’ Equity | Noncontrolling Interests
--- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2017 | $ 146,189 | $ 271 | $ 231,183 | $ (90,121) | $ 0 | $ 141,333 | $ 4,856
Beginning balance (in shares) at Dec. 31, 2017 |  | 27,051,000 |  |  | 0 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 3,680 |  |  | 2,489 |  | 2,489 | 1,191
Share-based compensation | 617 |  | 617 |  |  | 617 |
Stock-based compensation (in shares) |  | (3,000) |  |  |  |  |
Distributions to owners | 0 |  |  |  |  |  |
Shares withheld for taxes | (194) | $ (1) | (193) |  |  | (194) |
Shares withheld for taxes (in shares) |  | (13,000) |  |  |  |  |
Ending balance at Mar. 31, 2018 | 150,292 | $ 270 | 231,607 | (87,632) | $ 0 | 144,245 | 6,047
Ending balance (in shares) at Mar. 31, 2018 |  | 27,035,000 |  |  | 0 |  |
Beginning balance at Dec. 31, 2018 | $ 172,260 | $ 271 | 233,795 | (64,934) | $ (4,731) | 164,401 | 7,859
Beginning balance (in shares) at Dec. 31, 2018 | 27,064,000 | 26,597,455 |  |  | 467,000 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | $ 1,861 |  |  | 1,815 |  | 1,815 | 46
Share-based compensation | 1,021 |  | 1,021 |  |  | 1,021 |
Stock-based compensation (in shares) |  | (1,000) |  |  |  |  |
Distributions to owners | (5,100) |  |  |  |  |  | (5,100)
Purchase of treasury stock | (3,201) |  |  |  | $ (3,201) | (3,201) |
Purchase of treasury stock (in shares) |  | (250,000) |  |  | 250,000 |  |
Issuance of stock | 0 |  | (1,314) |  | $ 1,314 |  |
Issuance of stock (in shares) |  | 130,000 |  |  | (130,000) |  |
Shares withheld for taxes | (564) | $ 0 |  |  | $ (564) | (564) |
Shares withheld for taxes (in shares) |  | (52,000) |  |  | 45,000 |  |
Ending balance at Mar. 31, 2019 | $ 166,277 | $ 271 | $ 233,502 | $ (63,119) | $ (7,182) | $ 163,472 | $ 2,805
Ending balance (in shares) at Mar. 31, 2019 |  | 26,424,000 |  |  | 632,000 |  |

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