NET INCOME PER COMMON SHARE - Computation of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2015 |
Sep. 30, 2015 |
Jun. 30, 2015 |
Mar. 31, 2015 |
Dec. 31, 2014 |
Sep. 30, 2014 |
Jun. 30, 2014 |
Mar. 31, 2014 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Basic: | |||||||||||
| Net income attributable to ISG | $ 1,276 | $ 1,778 | $ 934 | $ 853 | $ 657 | $ 2,353 | $ 3,105 | $ 63 | $ 4,841 | $ 6,178 | $ 4,776 |
| Weighted average common shares | 37,198 | 37,315 | 37,199 | 37,032 | 36,702 | 37,039 | 37,220 | 37,383 | 37,186 | 37,086 | 36,810 |
| Earnings per share attributable to ISG | $ 0.03 | $ 0.05 | $ 0.03 | $ 0.02 | $ 0.02 | $ 0.06 | $ 0.08 | $ 0.00 | $ 0.13 | $ 0.17 | $ 0.13 |
| Diluted: | |||||||||||
| Net income attributable to ISG | $ 1,276 | $ 1,778 | $ 934 | $ 853 | $ 657 | $ 2,353 | $ 3,105 | $ 63 | $ 4,841 | $ 6,178 | $ 4,776 |
| Interest expense of convertible debt, net of tax | 80 | 80 | 108 | ||||||||
| Net income, attributable to ISG, as adjusted | $ 4,921 | $ 6,258 | $ 4,884 | ||||||||
| Basic Weighted Average Common shares | 37,198 | 37,315 | 37,199 | 37,032 | 36,702 | 37,039 | 37,220 | 37,383 | 37,186 | 37,086 | 36,810 |
| Potential common shares | 1,750 | 1,607 | 1,877 | ||||||||
| Diluted weighted average common shares | 38,986 | 39,296 | 38,971 | 38,490 | 38,333 | 38,740 | 38,837 | 38,861 | 38,936 | 38,693 | 38,687 |
| Diluted earnings per share attributable to ISG | $ 0.03 | $ 0.05 | $ 0.02 | $ 0.02 | $ 0.02 | $ 0.06 | $ 0.08 | $ 0.00 | $ 0.13 | $ 0.16 | $ 0.13 |