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Quarterly Financial Information (Summary Of Consolidated Quarterly Financial Information) (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 | Dec. 31, 2012
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues | $ 207,160 us-gaap_SalesRevenueNet | $ 340,837 us-gaap_SalesRevenueNet | $ 305,587 us-gaap_SalesRevenueNet | $ 253,572 us-gaap_SalesRevenueNet | $ 226,837 us-gaap_SalesRevenueNet | $ 220,117 us-gaap_SalesRevenueNet | $ 232,178 us-gaap_SalesRevenueNet | $ 197,429 us-gaap_SalesRevenueNet | $ 1,107,156 us-gaap_SalesRevenueNet | $ 876,561 us-gaap_SalesRevenueNet | $ 846,109 us-gaap_SalesRevenueNet
Gross profit | 32,805 us-gaap_GrossProfit | 126,247 us-gaap_GrossProfit | 109,138 us-gaap_GrossProfit | 75,846 us-gaap_GrossProfit | 71,164 us-gaap_GrossProfit | 69,457 us-gaap_GrossProfit | 67,497 us-gaap_GrossProfit | 52,567 us-gaap_GrossProfit | 344,036 us-gaap_GrossProfit | 260,685 us-gaap_GrossProfit | 49,915 us-gaap_GrossProfit
Net income applicable to Helix: |  |  |  |  |  |  |  |  |  |  |
Net income from continuing operations |  |  |  |  | 36,503 us-gaap_IncomeLossFromContinuingOperations | 44,549 us-gaap_IncomeLossFromContinuingOperations | 27,240 us-gaap_IncomeLossFromContinuingOperations | 557 us-gaap_IncomeLossFromContinuingOperations | 195,047 us-gaap_IncomeLossFromContinuingOperations | 108,849 us-gaap_IncomeLossFromContinuingOperations | (70,018)us-gaap_IncomeLossFromContinuingOperations
Income (loss) from discontinued operations |  |  |  |  |  | 44 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (29)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 1,058 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  | 1,073 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 23,684 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Net income (loss) applicable to Helix | 7,960 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 75,586 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 57,782 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 53,719 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 36,503 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 44,593 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 27,211 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 1,615 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 195,047 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 109,922 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | (46,334)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Basic earnings per common share: |  |  |  |  |  |  |  |  |  |  |
Continuing operations |  |  |  |  | $ 0.35 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.42 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.26 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.01 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 1.85 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 1.03 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ (0.67)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Discontinued operations |  |  |  |  |  |  |  | $ 0.01 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare |  | $ 0.01 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.23 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Net income (loss) per common share | $ 0.08 us-gaap_EarningsPerShareBasic | $ 0.72 us-gaap_EarningsPerShareBasic | $ 0.55 us-gaap_EarningsPerShareBasic | $ 0.51 us-gaap_EarningsPerShareBasic | $ 0.35 us-gaap_EarningsPerShareBasic | $ 0.42 us-gaap_EarningsPerShareBasic | $ 0.26 us-gaap_EarningsPerShareBasic | $ 0.02 us-gaap_EarningsPerShareBasic | $ 1.85 us-gaap_EarningsPerShareBasic | $ 1.04 us-gaap_EarningsPerShareBasic | $ (0.44)us-gaap_EarningsPerShareBasic
Diluted earnings (loss) per common share: |  |  |  |  |  |  |  |  |  |  |
Continuing operations |  |  |  |  | $ 0.35 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.42 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.26 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.01 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 1.85 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 1.03 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ (0.67)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Discontinued operations |  |  |  |  |  |  |  | $ 0.01 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare |  | $ 0.01 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.23 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
Net income (loss) per common share | $ 0.08 us-gaap_EarningsPerShareDiluted | $ 0.71 us-gaap_EarningsPerShareDiluted | $ 0.55 us-gaap_EarningsPerShareDiluted | $ 0.51 us-gaap_EarningsPerShareDiluted | $ 0.35 us-gaap_EarningsPerShareDiluted | $ 0.42 us-gaap_EarningsPerShareDiluted | $ 0.26 us-gaap_EarningsPerShareDiluted | $ 0.02 us-gaap_EarningsPerShareDiluted | $ 1.85 us-gaap_EarningsPerShareDiluted | $ 1.04 us-gaap_EarningsPerShareDiluted | $ (0.44)us-gaap_EarningsPerShareDiluted
Discontinued Operations [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  | 48,800 us-gaap_SalesRevenueNet / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember |  |  |
Gross profit |  |  |  |  |  |  |  | $ 28,200 us-gaap_GrossProfit / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember |  |  |

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