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Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Additional Paid in Capital | Retained Deficit | Treasury Stock | Total Sterling Stockholders’ Equity | Non-controlling 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 |  |  | 0 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 3,680 |  |  | 2,489 |  | 2,489 | 1,191
Stock-based compensation | 617 |  | 617 |  |  | 617 |
Stock-based compensation (in shares) |  | (3) |  |  |  |  |
Shares withheld for taxes | (194) | $ (1) | (193) |  |  | (194) |
Shares withheld for taxes (in shares) |  | 13 |  |  |  |  |
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 |  |  | 0 |  |
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 |  |  | 0 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 22,989 |  |  |  |  |  |
Ending balance at Sep. 30, 2018 | 169,701 | $ 271 | 233,056 | (70,541) | $ 0 | 162,786 | 6,915
Ending balance (in shares) at Sep. 30, 2018 |  | 27,068 |  |  | 0 |  |
Beginning balance at Mar. 31, 2018 | 150,292 | $ 270 | 231,607 | (87,632) | $ 0 | 144,245 | 6,047
Beginning balance (in shares) at Mar. 31, 2018 |  | 27,035 |  |  | 0 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 9,141 |  |  | 8,174 |  | 8,174 | 967
Stock-based compensation | 766 |  | 766 |  |  | 766 |
Stock-based compensation (in shares) |  | 39 |  |  |  |  |
Shares withheld for taxes | (107) | $ 1 | (108) |  |  | (107) |
Shares withheld for taxes (in shares) |  | 10 |  |  |  |  |
Ending balance at Jun. 30, 2018 | 160,092 | $ 271 | 232,265 | (79,458) | $ 0 | 153,078 | 7,014
Ending balance (in shares) at Jun. 30, 2018 |  | 27,064 |  |  | 0 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 10,168 |  |  | 8,917 |  | 8,917 | 1,251
Stock-based compensation | 798 |  | 798 |  |  | 798 |
Stock-based compensation (in shares) |  | 4 |  |  |  |  |
Distributions to owners | (1,350) |  |  |  |  |  | (1,350)
Shares withheld for taxes | (7) |  | (7) |  |  | (7) |
Ending balance at Sep. 30, 2018 | 169,701 | $ 271 | 233,056 | (70,541) | $ 0 | 162,786 | 6,915
Ending balance (in shares) at Sep. 30, 2018 |  | 27,068 |  |  | 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 |  | 26,597 |  |  | 467 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 1,861 |  |  | 1,815 |  | 1,815 | 46
Stock-based compensation | 1,021 |  | 1,021 |  |  | 1,021 |
Stock-based compensation (in shares) |  | (1) |  |  |  |  |
Distributions to owners | (5,100) |  |  |  |  |  | (5,100)
Purchase of treasury stock | (3,201) |  |  |  | $ (3,201) | (3,201) |
Purchase of treasury stock (in shares) |  | 250 |  |  | 250 |  |
Issuance of stock |  |  | (1,314) |  | $ 1,314 |  |
Issuance of stock (in shares) |  | 130 |  |  | (130) |  |
Shares withheld for taxes | (564) |  |  |  | $ (564) | (564) |
Shares withheld for taxes (in shares) |  | 52 |  |  | 45 |  |
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 |  |  | 632 |  |
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 |  | 26,597 |  |  | 467 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | $ 18,235 |  |  |  |  |  |
Stock-based compensation (in shares) | 192 |  |  |  |  |  |
Ending balance at Sep. 30, 2019 | $ 183,259 | $ 271 | 234,309 | (47,334) | $ (6,581) | 180,665 | 2,594
Ending balance (in shares) at Sep. 30, 2019 |  | 26,476 |  |  | 573 |  |
Beginning balance at Mar. 31, 2019 | 166,277 | $ 271 | 233,502 | (63,119) | $ (7,182) | 163,472 | 2,805
Beginning balance (in shares) at Mar. 31, 2019 |  | 26,424 |  |  | 632 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 7,865 |  |  | 7,828 |  | 7,828 | 37
Stock-based compensation | 649 |  | 649 |  |  | 649 |
Issuance of stock |  |  | (494) |  | $ 494 |  |
Issuance of stock (in shares) |  | 49 |  |  | (49) |  |
Shares withheld for taxes | (98) |  | (98) |  |  | (98) |
Shares withheld for taxes (in shares) |  | 7 |  |  |  |  |
Ending balance at Jun. 30, 2019 | 174,693 | $ 271 | 233,559 | (55,291) | $ (6,688) | 171,851 | 2,842
Ending balance (in shares) at Jun. 30, 2019 |  | 26,466 |  |  | 583 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 8,509 |  |  | 7,957 |  | 7,957 | 552
Stock-based compensation | 819 |  | 819 |  |  | 819 |
Distributions to owners | (800) |  |  |  |  |  | (800)
Issuance of stock | 70 |  | (69) |  | $ 139 | 70 |
Issuance of stock (in shares) |  | 13 |  |  | (13) |  |
Shares withheld for taxes | (32) |  |  |  | $ (32) | (32) |
Shares withheld for taxes (in shares) |  | 3 |  |  | 3 |  |
Ending balance at Sep. 30, 2019 | $ 183,259 | $ 271 | $ 234,309 | $ (47,334) | $ (6,581) | $ 180,665 | $ 2,594
Ending balance (in shares) at Sep. 30, 2019 |  | 26,476 |  |  | 573 |  |

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