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SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013
SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) |  |  |  |  |  |  |  |  |  |
Revenues | $ 61,898 us-gaap_SalesRevenueGoodsNet | $ 65,280 us-gaap_SalesRevenueGoodsNet | $ 62,069 us-gaap_SalesRevenueGoodsNet | $ 60,435 us-gaap_SalesRevenueGoodsNet | $ 50,131 us-gaap_SalesRevenueGoodsNet | $ 24,876 us-gaap_SalesRevenueGoodsNet | $ 25,352 us-gaap_SalesRevenueGoodsNet | $ 25,143 us-gaap_SalesRevenueGoodsNet | $ 249,682 us-gaap_SalesRevenueGoodsNet | $ 125,502 us-gaap_SalesRevenueGoodsNet
Gross margin | 18,154 us-gaap_GrossProfit | 19,612 us-gaap_GrossProfit | 18,568 us-gaap_GrossProfit | 17,092 us-gaap_GrossProfit | 14,226 us-gaap_GrossProfit | 7,238 us-gaap_GrossProfit | 7,535 us-gaap_GrossProfit | 7,523 us-gaap_GrossProfit | 73,426 us-gaap_GrossProfit | 36,522 us-gaap_GrossProfit
Net income | $ 4,904 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 4,115 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 2,693 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 2,148 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 1,341 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 833 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 819 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 960 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 13,860 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 3,953 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Basic earnings per share (in dollars per share) | $ 0.54 us-gaap_EarningsPerShareBasic | $ 0.45 us-gaap_EarningsPerShareBasic | $ 0.29 us-gaap_EarningsPerShareBasic | $ 0.24 us-gaap_EarningsPerShareBasic | $ 0.15 us-gaap_EarningsPerShareBasic | $ 0.09 us-gaap_EarningsPerShareBasic | $ 0.09 us-gaap_EarningsPerShareBasic | $ 0.11 us-gaap_EarningsPerShareBasic | $ 1.52 us-gaap_EarningsPerShareBasic | $ 0.45 us-gaap_EarningsPerShareBasic
Diluted earnings per share (in dollars per share) | $ 0.53 us-gaap_EarningsPerShareDiluted | $ 0.45 us-gaap_EarningsPerShareDiluted | $ 0.29 us-gaap_EarningsPerShareDiluted | $ 0.24 us-gaap_EarningsPerShareDiluted | $ 0.15 us-gaap_EarningsPerShareDiluted | $ 0.09 us-gaap_EarningsPerShareDiluted | $ 0.09 us-gaap_EarningsPerShareDiluted | $ 0.11 us-gaap_EarningsPerShareDiluted | $ 1.51 us-gaap_EarningsPerShareDiluted | $ 0.45 us-gaap_EarningsPerShareDiluted

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- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 + Details
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