XML 17 R5.htm IDEA: XBRL DOCUMENT
v3.10.0.1

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Preferred Stock | Common Stock | Additional Paid-In Capital | Retained Earnings (Accumulated Deficit) | Total
--- | --- | --- | --- | --- | ---
Balances at Dec. 31, 2016 |  | $ 9 | $ 592,663 | $ (479,984) | $ 112,688
Balances (in shares) at Dec. 31, 2016 |  | 92,991 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income (loss) |  |  |  | 189,352 | 189,352
Sale of preferred stock |  |  | 352,048 |  | 352,048
Sale of preferred stock (in shares) | 6 |  |  |  |
Preferred beneficial conversion feature |  |  | 48,007 |  | 48,007
Offering costs |  |  | (11,829) |  | (11,829)
Long-term incentive plan forfeitures (in shares) |  | (41) |  |  |
Reduction in shares to cover individuals' tax withholding |  |  | (17) |  | (17)
Reduction in shares to cover individuals' tax withholding (in shares) |  | (2) |  |  |
Stock-based compensation |  |  | 8,539 |  | 8,539
Balances at Mar. 31, 2017 |  | $ 9 | 989,411 | (290,632) | 698,788
Balances (in shares) at Mar. 31, 2017 | 6 | 92,948 |  |  |
Balances at Dec. 31, 2016 |  | $ 9 | 592,663 | (479,984) | 112,688
Balances (in shares) at Dec. 31, 2016 |  | 92,991 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income (loss) |  |  |  |  | 628,816
Balances at Sep. 30, 2017 |  | $ 15 | 1,013,141 | 148,832 | 1,161,988
Balances (in shares) at Sep. 30, 2017 |  | 149,666 |  |  |
Balances at Mar. 31, 2017 |  | $ 9 | 989,411 | (290,632) | 698,788
Balances (in shares) at Mar. 31, 2017 | 6 | 92,948 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income (loss) |  |  |  | 20,177 | 20,177
Conversion of preferred stock |  | $ 6 | (6) |  |
Conversion of preferred stock (in shares) | (6) | 55,180 |  |  |
Offering costs |  |  | (90) |  | (90)
Long-term incentive plan grants (in shares) |  | 2,022 |  |  |
Long-term incentive plan forfeitures (in shares) |  | (48) |  |  |
Stock-based compensation |  |  | 13,154 |  | 13,154
Balances at Jun. 30, 2017 |  | $ 15 | 1,002,469 | (270,455) | 732,029
Balances (in shares) at Jun. 30, 2017 |  | 150,102 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income (loss) |  |  |  | 419,287 | 419,287
Long-term incentive plan forfeitures (in shares) |  | (143) |  |  |
Reduction in shares to cover individuals' tax withholding |  |  | (1,828) |  | (1,828)
Reduction in shares to cover individuals' tax withholding (in shares) |  | (293) |  |  |
Stock-based compensation |  |  | 12,500 |  | 12,500
Balances at Sep. 30, 2017 |  | $ 15 | 1,013,141 | 148,832 | 1,161,988
Balances (in shares) at Sep. 30, 2017 |  | 149,666 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income (loss) |  |  |  | (93,130) | (93,130)
Long-term incentive plan forfeitures (in shares) |  | (266) |  |  |
Reduction in shares to cover individuals' tax withholding |  |  | (150) |  | (150)
Reduction in shares to cover individuals' tax withholding (in shares) |  | (21) |  |  |
Stock-based compensation |  |  | 3,290 |  | 3,290
Balances at Dec. 31, 2017 |  | $ 15 | 1,016,281 | 55,702 | 1,071,998
Balances (in shares) at Dec. 31, 2017 |  | 149,379 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income (loss) |  |  |  | (2,598) | (2,598)
Common stock issuance |  | $ 1 | 63,479 |  | 63,480
Common stock issuance (in shares) |  | 9,200 |  |  |
Offering costs |  |  | (3,044) |  | (3,044)
Stock option exercises |  |  | 323 |  | 323
Stock option exercises (in shares) |  | 42 |  |  |
Long-term incentive plan grants (in shares) |  | 1,922 |  |  |
Long-term incentive plan forfeitures (in shares) |  | (74) |  |  |
Stock-based compensation |  |  | 4,066 |  | 4,066
Balances at Mar. 31, 2018 |  | $ 16 | 1,081,105 | 53,104 | 1,134,225
Balances (in shares) at Mar. 31, 2018 |  | 160,469 |  |  |
Balances at Dec. 31, 2017 |  | $ 15 | 1,016,281 | 55,702 | 1,071,998
Balances (in shares) at Dec. 31, 2017 |  | 149,379 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income (loss) |  |  |  |  | (100,709)
Balances at Sep. 30, 2018 |  | $ 16 | 1,091,441 | (45,007) | 1,046,450
Balances (in shares) at Sep. 30, 2018 |  | 160,676 |  |  |
Balances at Mar. 31, 2018 |  | $ 16 | 1,081,105 | 53,104 | 1,134,225
Balances (in shares) at Mar. 31, 2018 |  | 160,469 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income (loss) |  |  |  | (16,274) | (16,274)
Long-term incentive plan grants (in shares) |  | 320 |  |  |
Long-term incentive plan forfeitures (in shares) |  | (136) |  |  |
Reduction in shares to cover individuals' tax withholding |  |  | (262) |  | (262)
Reduction in shares to cover individuals' tax withholding (in shares) |  | (53) |  |  |
Stock-based compensation |  |  | 5,194 |  | 5,194
Balances at Jun. 30, 2018 |  | $ 16 | 1,086,037 | 36,830 | 1,122,883
Balances (in shares) at Jun. 30, 2018 |  | 160,600 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income (loss) |  |  |  | (81,837) | (81,837)
Long-term incentive plan grants (in shares) |  | 84 |  |  |
Long-term incentive plan forfeitures (in shares) |  | (8) |  |  |
Stock-based compensation |  |  | 5,404 |  | 5,404
Balances at Sep. 30, 2018 |  | $ 16 | $ 1,091,441 | $ (45,007) | $ 1,046,450
Balances (in shares) at Sep. 30, 2018 |  | 160,676 |  |  |

X
- Definition Amount of a favorable spread to a preferred stockholder between the amount of preferred stock being converted and the value of the securities received upon conversion. This is an embedded conversion feature of convertible preferred stock issued that is in-the-money at the commitment date. + References No definition available. + Details
Name: | hk_PreferredStockConvertibleBeneficialConversionFeature
Namespace Prefix: | hk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition This element represents the number of shares of stock that have been purchased and retired to cover individual tax withholding. + References No definition available. + Details
Name: | hk_PurchaseOfSharesToCoverIndividualsTaxWithholdingShares
Namespace Prefix: | hk_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents the value of stock that has been purchased and retired to cover individual tax withholding. + References No definition available. + Details
Name: | hk_PurchaseOfSharesToCoverIndividualsTaxWithholdingValue
Namespace Prefix: | hk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of shares issued for exercise of options. + References No definition available. + Details
Name: | hk_StockIssuedDuringPeriodSharesIssuedForExerciseOfOptions
Namespace Prefix: | hk_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of new preferred stock shares issued during the period. + References No definition available. + Details
Name: | hk_StockIssuedDuringPeriodSharesPreferredNewStock
Namespace Prefix: | hk_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Value of stock issued for exercise of options. + References No definition available. + Details
Name: | hk_StockIssuedDuringPeriodValueIssuedForExerciseOfOptions
Namespace Prefix: | hk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Equity impact of the value of new preferred stock issued during the period. + References No definition available. + Details
Name: | hk_StockIssuedDuringPeriodValuePreferredStockNewIssues
Namespace Prefix: | hk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Equity impact of direct costs (e.g., legal and accounting fees) associated with issuing stock. + References No definition available. + Details
Name: | hk_StockIssuedIssuanceCosts
Namespace Prefix: | hk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of increase to additional paid-in capital (APIC) from recognition of equity-based compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=79507207&loc=d3e4534-113899 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=96864182&loc=d3e11149-113907 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=96864182&loc=d3e11178-113907 + Details
Name: | us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_IncreaseDecreaseInStockholdersEquityRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(22)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(18)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 5: 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(20)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_NetIncomeLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Number of shares issued which are neither cancelled nor held in the treasury. + References No definition available. + Details
Name: | us-gaap_SharesOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of shares issued during the period as a result of the conversion of convertible securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-30) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644 + Details
Name: | us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of new stock issued during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
Name: | us-gaap_StockIssuedDuringPeriodSharesNewIssues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of shares related to Restricted Stock Award forfeited during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
Name: | us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
Name: | us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The gross value of stock issued during the period upon the conversion of convertible securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
Name: | us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_StockIssuedDuringPeriodValueNewIssues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_StockholdersEquity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant