CNX Resources (CNX) 10-Q 1 Aug 17 2017 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2017	Jul. 17, 2017
Document Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q2
Entity Registrant Name	CONSOL Energy Inc
Entity Central Index Key	1,070,412
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		230,069,268

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Natural Gas, NGLs and Oil Sales	$ 260,305		$ 167,931	$ 578,068	$ 349,188
Unrealized Gain (Loss) on Commodity Derivatives	83,788		(199,380)	61,325	(144,320)
Coal Sales	303,707		250,562	620,155	476,726
Other Revenue, Net	15,974		8,207	29,027	15,973
Purchased Gas Sales	10,316		7,929	19,294	16,547
Freight-Outside	17,763		11,447	30,045	24,557
Other Income (including equity earnings)	33,937		33,636	74,633	81,766
Gain (Loss) on Sale of Assets	140,162		5,614	152,113	(1,662)
Total Revenue and Other Income	865,952		285,946	1,564,660	818,775
Oil and Gas Property, Lease Operating Expense	21,072		23,655	42,705	51,394
Gas Gathering, Transportation, Marketing and Processing Costs	86,599		90,983	180,931	184,957
Production Tax Expense	4,606		6,402	13,935	14,705
E&P Depreciation, Depletion, and Amortization	91,287		105,151	186,635	210,866
Exploration and Production Costs	19,715		2,905	29,501	4,652
Production Royalty Interests and Purchased Gas Costs	10,194		8,884	19,089	16,752
Other Expenses	23,398		21,422	41,328	44,220
Impairment of Oil and Gas Properties	0	$ 137,865	0	137,865	0
Results of Operations, General and Administrative Related to Oil and Gas Producing Activities	20,672		25,411	42,162	47,869
Oil and Gas Production Expense	277,543		284,813	694,151	575,415
Operating Expenses	201,091		184,459	400,905	338,560
Coal Depreciation, Depletion, Amortization	41,402		41,698	83,703	82,964
Freight Expense	17,763		11,447	30,045	24,557
General and Administrative Expense	17,104		6,779	31,972	12,554
Cost of Coal Products and Services	277,360		244,383	546,625	458,635
Other Nonoperating Expense	38,731		51,776	81,493	86,923
Other General and Administrative Expense	3,654		4,075	6,286	6,128
Depreciation, Depletion and Amortization, Nonproduction	(15,620)		(11,629)	(4,499)	(3,622)
Gain (Loss) on Extinguishment of Debt	36		0	(786)	0
Interest Expense	43,432		47,428	87,865	97,292
Other General Expense	70,233		91,650	170,359	186,721
Costs and Expenses	625,136		620,846	1,411,135	1,220,771
Income (Loss) from Continuing Operations before Income Taxes, Domestic	240,816		(334,900)	153,525	(401,996)
Income Tax Expense (Benefit)	66,993		(100,856)	13,204	(124,656)
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	173,823		(234,044)	140,321	(277,340)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	169,510		(235,223)	130,544	(279,633)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	0		(234,605)	0	(287,772)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	173,823		(468,649)	140,321	(565,112)
Net Income (Loss) Attributable to Noncontrolling Interest	4,313		1,179	9,777	2,293
Net Income (Loss)	$ 169,510		$ (469,828)	$ 130,544	$ (567,405)

Consolidated Statements of Inc3

Consolidated Statements of Income Earnings Per Share - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share [Abstract]
Income (Loss) from Continuing Operations, Per Basic Share	$ 0.74	$ (1.03)	$ 0.57	$ (1.22)
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share	0	(1.02)	0	(1.25)
Earnings Per Share, Basic	0.74	(2.05)	0.57	(2.47)
Income (Loss) from Continuing Operations, Per Diluted Share	0.73	(1.03)	0.56	(1.22)
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share	0	(1.02)	0	(1.25)
Earnings Per Share, Diluted	0.73	(2.05)	0.56	(2.47)
Common Stock, Dividends, Per Share, Cash Paid	$ 0	$ 0	$ 0	$ 0.0100

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Condensed Statement of Income Captions [Line Items]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 173,823	$ (468,649)	$ 140,321	$ (565,112)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	3,464	8,045	6,966	5,561
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	0	(11,203)	0	(21,017)
Other Comprehensive Income (Loss), Net of Tax	3,464	(3,158)	6,966	(15,456)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	177,287	(471,807)	147,287	(580,568)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	4,302	1,179	9,754	2,293
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 172,985	$ (472,986)	$ 137,533	$ (582,861)

Consolidated Statements of Com5

Consolidated Statements of Comprehensive Income (Parentheticals) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Adjustment For Actuarially Determined Liabilities [Member]
Other Comprehensive Income (Loss), Tax	$ (2,034)	$ (5,008)	$ (4,086)	$ (4,326)
Cash Flow Hedging [Member]
Other Comprehensive Income (Loss), Tax	$ 0	$ 6,521	$ 0	$ 12,145

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current Assets:
Cash and Cash Equivalents	$ 299,135	$ 60,475
Accounts and Notes Receivable:
Trade	215,650	220,222
Other Receivables, Net, Current	77,609	69,901
Inventories	74,965	65,461
Recoverable Income Taxes	115,558	116,851
Prepaid Expenses	64,177	93,146
Disposal Group, Including Discontinued Operation, Assets, Current	0	83
Total Current Assets	847,094	626,139
Property, Plant and Equipment:
Property, Plant and Equipment	13,619,819	13,771,388
Less-Accumulated Depreciation, Depletion and Amortization	5,825,601	5,630,949
Total Property, Plant and Equipment-Net	7,794,218	8,140,439
Other Assets:
Deferred Income Taxes	0	4,290
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	188,649	190,964
Other	195,231	222,149
Total Other Assets	383,880	417,403
Total Assets	9,025,192	9,183,981
Current Liabilities:
Accounts Payable	265,125	241,616
Current Portion of Long-Term Debt	11,385	12,000
Other Accrued Liabilities	543,511	680,348
Disposal Group, Including Discontinued Operation, Liabilities, Current	5,692	6,050
Total Current Liabilities	825,713	940,014
Long-Term Debt:
Long-Term Debt	2,596,055	2,722,995
Capital Lease Obligations	34,053	39,074
Total Long-Term Debt	2,630,108	2,762,069
Deferred Credits and Other Liabilities
Deferred Tax Liabilities, Net, Noncurrent	17,084	0
Postretirement Benefits Other Than Pensions	652,206	659,474
Pneumoconiosis Benefits	107,321	108,073
Mine Closing	200,132	218,631
Gas Well Closing	224,327	223,352
Workers' Compensation	66,009	67,277
Salary Retirement	104,463	112,543
Other Liabilities, Noncurrent	110,282	151,660
Total Deferred Credits and Other Liabilities	1,481,824	1,541,010
TOTAL LIABILITIES	4,937,645	5,243,093
Stockholders' Equity:
Common Stock, $.01 Par Value; 500,000,000 Shares Authorized, 230,034,586 Issued and Outstanding at March 31, 2017; 229,443,008 Issued and Outstanding at December 31, 2016	2,304	2,298
Capital in Excess of Par Value	2,476,552	2,460,864
Preferred Stock, 15,000,000 shares authorized, None issued and outstanding	0	0
Retained Earnings	1,852,048	1,727,789
Accumulated Other Comprehensive Loss	(385,567)	(392,556)
Stockholders' Equity Attributable to Parent	3,945,337	3,798,395
Stockholders' Equity Attributable to Noncontrolling Interest	142,210	142,493
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	4,087,547	3,940,888
TOTAL LIABILITIES AND EQUITY	$ 9,025,192	$ 9,183,981

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parentheticals) - $ / shares	Jun. 30, 2017	Dec. 31, 2016
Common Stock [Member]
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common Stock, Shares Authorized	500,000,000	500,000,000
Common Stock, Shares, Issued	230,067,466	229,443,008
Common Stock, Shares, Outstanding	230,067,466	229,443,008
Treasury Stock, Shares	0	0
Preferred Stock [Member]
Preferred Stock, Shares Authorized	15,000,000	15,000,000
Preferred Stock, Shares Issued	0	0
Preferred Stock, Shares Outstanding	0	0

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - 6 months ended Jun. 30, 2017 - USD ($) $ in Thousands	Total	Common Stock [Member]	Capital in Excess of Par Value [Member]	Retained Earnings (Deficit) [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total CONSOL Energy Inc. Stockholders' Equity [Member]	Noncontrolling Interest [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Dec. 31, 2016	$ 3,940,888	$ 2,298	$ 2,460,864	$ 1,727,789	$ (392,556)	$ 3,798,395	$ 142,493
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	140,321	0	0	130,544	0	130,544	9,777
Other Comprehensive Income (Loss), Net of Tax	6,966	0	0	0	6,989	6,989	(23)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	147,287	0	0	130,544	6,989	137,533	9,754
Proceeds from Issuance of Common Stock	723	6	717	0	0	723	(808)
Stock Granted, Value, Share-based Compensation, Forfeited	(7,093)	0	0	(6,285)	0	(6,285)	0
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	16,677	0	14,971	0	0	14,971	1,706
Noncontrolling Interest, Period Increase (Decrease)	(10,935)	0	0	0	0	0	(10,935)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Jun. 30, 2017	$ 4,087,547	$ 2,304	$ 2,476,552	$ 1,852,048	$ (385,567)	$ 3,945,337	$ 142,210

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 140,321	$ (565,112)
Adjustments to Reconcile Net Income to Net Cash Provided By Operating Activities:
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	0	287,772
Depreciation, Depletion and Amortization	265,839	290,208
Impairment of Oil and Gas Properties	137,865	0
Stock-Based Compensation	16,677	16,054
(Gain) Loss on Sale of Assets	(152,113)	1,662
Gain (Loss) on Extinguishment of Debt	(786)	0
Increase (Decrease) Cash Collateral from Counterparties	(79,388)	164,666
Gain (Loss) on Hedging Activity	(61,325)	144,320
Deferred Income Taxes	17,288	(124,516)
Equity in Earnings of Affiliates	(22,385)	(25,884)
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital	0	9,192
Changes in Operating Assets:
Accounts and Notes Receivable	(4,103)	18,101
Inventories	(9,798)	(7,947)
Prepaid Expenses	11,515	47,136
Changes in Other Assets	25,652	(15,298)
Changes in Operating Liabilities:
Accounts Payable	2,524	(44,124)
Increase (Decrease) in Interest Payable, Net	(1,444)	(807)
Other Operating Liabilities	(8,029)	(14,069)
Changes in Other Liabilities	(21,331)	15,343
Other	37,192	9,648
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	294,171	206,345
Cash Provided by (Used in) Operating Activities, Discontinued Operations	(275)	19,053
Net Cash Provided by Operating Activities	293,896	225,398
Investing Activities:
Capital Expenditures	(273,326)	(115,257)
Proceeds from Sale of Productive Assets	345,151	18,284
Net Investment in Equity Affiliates	24,700	(5,578)
Net Cash Provided by (Used in) Investing Activities, Continuing Operations	96,525	(102,551)
Cash Provided by (Used in) Investing Activities, Discontinued Operations	0	394,511
Net Cash Used in Investing Activities	96,525	291,960
Financing Activities:
(Payments on) Proceeds from Short-Term Borrowings	0	(486,000)
Payments on Miscellaneous Borrowings	(5,973)	(4,459)
Payments On Long Term Notes Including Redemption Premium	(117,185)	0
Net Proceeds from Revolver - MLP	(11,000)	13,000
Noncontrolling Interest, Period Increase (Decrease)	(10,935)	(10,825)
Dividends Paid	0	(2,294)
Proceeds from Issuance of Common Stock	723	4
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	(7,093)	(1,657)
Debt Issuance and Financing Fees	(298)	0
Net Cash Provided by (Used in) Financing Activities, Continuing Operations	(151,761)	(492,231)
Cash Provided by (Used in) Financing Activities, Discontinued Operations	0	(75)
Net Cash (Used in) Provided by Financing Activities	(151,761)	(492,306)
Net Increase in Cash and Cash Equivalents	238,660	25,052
Cash and Cash Equivalents, at Carrying Value	60,475	72,574
Cash and Cash Equivalents at End of Period	$ 299,135	$ 97,626

Basis of Presentation

Basis of Presentation	6 Months Ended
	Jun. 30, 2017
BASIS OF PRESENTATION: [Abstract]
Basis of Presentation	BASIS OF PRESENTATION: The accompanying Unaudited Consolidated Financial Statements have been prepared in accordance with generally accepted accounting principles for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. Operating results for the three and six months ended June 30, 2017 are not necessarily indicative of the results that may be expected for future periods. The Consolidated Balance Sheet at December 31, 2016 has been derived from the Audited Consolidated Financial Statements at that date but does not include all the notes required by generally accepted accounting principles for complete financial statements. For further information, refer to the Consolidated Financial Statements and related notes for the year ended December 31, 2016 included in CONSOL Energy Inc.'s Annual Report on Form 10-K. Certain amounts in prior periods, primarily relating to discontinued operations, have been reclassified to conform with the report classifications of the year ended December 31, 2016, with no effect on previously reported net income or stockholders' equity. In March 2016, the Financial Accounting Standards Board (FASB) issued an Accounting Standards Update on stock compensation that intends to simplify and improve the accounting and statement of cash flow presentation for income taxes at settlement, forfeitures, and net settlements for withholding tax. The guidance is effective for public entities for fiscal years beginning after December 15, 2016. In accordance with this Update, $(44) and $4,565 of additional income tax (benefit) expense was recognized in the Consolidated Statements of Income for the three and six months ended June 30, 2017 , respectively. Also in accordance with this Update, the value of shares withheld for employee tax withholding purposes of $7,093 and $1,657 for the six months ended June 30, 2017 and 2016 , respectively, were reclassified between Net Cash Provided by Operating Activities and Net Cash Used in Financing Activities of the Consolidated Statements of Cash Flows. As permitted by this Update, the Company has elected to account for forfeitures of stock compensation as they occur. The cumulative effect of the policy election to recognize forfeitures as they occur was immaterial. Basic earnings per share are computed by dividing net income attributable to CONSOL Energy Inc. ("CONSOL Energy" or the "Company") shareholders by the weighted average shares outstanding during the reporting period. Dilutive earnings per share are computed similarly to basic earnings per share, except that the weighted average shares outstanding are increased to include additional shares from stock options, performance stock options, restricted stock units and performance share units, if dilutive. The number of additional shares is calculated by assuming that outstanding stock options and performance share options were exercised, that outstanding restricted stock units and performance share units were released, and that the proceeds from such activities were used to acquire shares of common stock at the average market price during the reporting period. The table below sets forth the share-based awards that have been excluded from the computation of the diluted earnings per share because their effect would be anti-dilutive: For the Three Months Ended June 30, For the Six Months Ended June 30, 2017 2016 2017 2016 Anti-Dilutive Options 2,360,197 6,348,665 2,360,197 6,348,665 Anti-Dilutive Restricted Stock Units 194,071 742,868 190,658 742,868 Anti-Dilutive Performance Share Units 1,284,924 951,541 1,284,924 951,541 Anti-Dilutive Performance Stock Options 802,804 802,804 802,804 802,804 4,641,996 8,845,878 4,638,583 8,845,878 The table below sets forth the share-based awards that have been exercised or released: For the Three Months Ended June 30, For the Six Months Ended June 30, 2017 2016 2017 2016 Options 28,838 — 90,462 — Restricted Stock Units 221 83,710 334,261 568,390 Performance Share Units — — 560,936 — 29,059 83,710 985,659 568,390 The computations for basic and dilutive earnings per share are as follows: For the Three Months Ended June 30, For the Six Months Ended June 30, 2017 2016 2017 2016 Numerator: Income (Loss) from Continuing Operations $ 173,823 $ (234,044 ) $ 140,321 $ (277,340 ) Less: Net Income Attributable to Non-Controlling Interest 4,313 1,179 9,777 2,293 Net Income (Loss) from Continuing Operations Attributable to CONSOL Energy Shareholders $ 169,510 $ (235,223 ) $ 130,544 $ (279,633 ) Loss from Discontinued Operations — (234,605 ) — (287,772 ) Net Income (Loss) Attributable to CONSOL Energy Shareholders $ 169,510 $ (469,828 ) $ 130,544 $ (567,405 ) Denominator: Weighted-average shares of common stock outstanding 230,058,422 229,409,325 229,938,462 229,334,277 Effect of dilutive shares 2,139,974 — 2,286,571 — Weighted-average diluted shares of common stock outstanding 232,198,396 229,409,325 232,225,033 229,334,277 Earnings (Loss) per Share: Basic (Continuing Operations) $ 0.74 $ (1.03 ) $ 0.57 $ (1.22 ) Basic (Discontinued Operations) — (1.02 ) — (1.25 ) Total Basic $ 0.74 $ (2.05 ) $ 0.57 $ (2.47 ) Dilutive (Continuing Operations) $ 0.73 $ (1.03 ) $ 0.56 $ (1.22 ) Dilutive (Discontinued Operations) — (1.02 ) — (1.25 ) Total Dilutive $ 0.73 $ (2.05 ) $ 0.56 $ (2.47 ) Changes in Accumulated Other Comprehensive Loss by component, net of tax, were as follows: Long-Term Liabilities Balance at December 31, 2016 $ (392,556 ) Amounts Reclassified from Accumulated Other Comprehensive Loss 6,966 Add: Other Comprehensive Loss Attributable to Non-Controlling Interest 23 Balance at June 30, 2017 $ (385,567 ) The following table shows the reclassification of adjustments out of Accumulated Other Comprehensive Loss: For the Three Months Ended June 30, For the Six Months Ended June 30, 2017 2016 2017 2016 Derivative Instruments (Note 13) Natural Gas Price Swaps and Options $ — $ (17,724 ) $ — $ (33,162 ) Tax Expense — 6,521 — 12,145 Net of Tax $ — $ (11,203 ) $ — $ (21,017 ) Actuarially Determined Long-Term Liability Adjustments* (Note 5 and Note 6) Amortization of Prior Service Costs $ (749 ) $ (148 ) $ (1,498 ) $ (295 ) Recognized Net Actuarial Loss 6,247 5,706 12,550 11,217 Settlement Loss — 13,696 — 13,696 Total 5,498 19,254 11,052 24,618 Tax Benefit (2,034 ) (7,178 ) (4,086 ) (9,196 ) Net of Tax $ 3,464 $ 12,076 $ 6,966 $ 15,422

Discontinued Operations (Notes)

Discontinued Operations (Notes)	6 Months Ended
	Jun. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Groups, Including Discontinued Operations, Disclosure [Text Block]	DISCONTINUED OPERATIONS: In August 2016, CONSOL Energy completed the sale of the Miller Creek and Fola Mining Complexes. In the transaction, the buyer acquired the Miller Creek and Fola assets and assumed the Miller Creek and Fola mine closing and reclamation liabilities. In order to equalize the value exchange, CONSOL Energy paid $28,271 of cash at closing, which included property taxes associated with the properties sold and other closing costs (a portion of which will be held in escrow for purposes of obtaining the surety bonds required for the permits to transfer). CONSOL Energy will also pay a total of $13,700 in remaining installments over the next three years ending in January 2020. In March 2016, CONSOL Energy completed the sale of its membership interests in CONSOL Buchanan Mining Company, LLC (BMC), which owned and operated the Buchanan Mine located in Mavisdale, Virginia; various assets relating to the Amonate Mining Complex located in Amonate, Virginia; Russell County, Virginia coal reserves and Pangburn Shaner Fallowfield coal reserves located in Southwestern, Pennsylvania to Coronado IV LLC ("Coronado"). Various CONSOL Energy assets were excluded from the sale including coalbed methane, natural gas and minerals other than coal, current assets of BMC, certain coal seams, certain surface rights, and the Amonate Preparation Plant. Coronado assumed only specified liabilities and various CONSOL Energy liabilities were excluded and not assumed. The excluded liabilities included BMC’s indebtedness, trade payables and liabilities arising prior to closing, as well as the liabilities of the subsidiaries other than BMC which are parties to the sale. In addition, the buyer agreed to pay CONSOL Energy for Buchanan Mine coal sold outside the U.S. and Canada during the five years following closing a royalty of 20% of any excess of the gross sales price per ton over the following amounts: (1) year one, $75.00 per ton; (2) year two, $78.75 per ton; (3) year three, $82.69 per ton; (4) year four, $86.82 per ton; (5) year five, $91.16 per ton. Total royalty income recognized under this agreement was $1,162 and $6,424 for the three and six months ended June 30, 2017 , respectively, and was included in Miscellaneous Other Income on the Consolidated Statements of Income. At closing, the parties entered into several agreements including, among others, agreements relating to the coordination and conduct of gas operations at the mines, an option to purchase the Amonate Preparation Plant and transition services. Cash proceeds of $402,799 were received at closing and are included in Net Cash Provided by Discontinued Investing Activities on the Consolidated Statements of Cash Flows for the six months ended June 30, 2016. The net loss on the sale was $38,364 and was included in Loss from Discontinued Operations, net on the Consolidated Statements of Income for the six months ended June 30, 2016. For all periods presented in the accompanying Consolidated Statements of Income, BMC along with the various other assets and the Miller Creek and Fola Mining Complexes are classified as discontinued operations. The following table details selected financial information for the divested business included within discontinued operations: For the Three Months Ended For the Six Months Ended June 30, 2016 June 30, 2016 Coal Sales $ 19,411 $ 95,930 Freight-Outside Coal 5 1,017 Miscellaneous Other Income 2 33 Gain (Loss) on Sale of Assets 100 (38,253 ) Total Revenue and Other Income $ 19,518 $ 58,727 Total Costs 25,010 113,076 Loss From Operations Before Income Taxes $ (5,492 ) $ (54,349 ) Impairment on Assets Held for Sale 355,681 355,681 Income Tax Benefit (126,568 ) (122,258 ) Loss From Discontinued Operations, net $ (234,605 ) $ (287,772 ) The following table details the major classes of assets and liabilities of discontinued operations: June 30, December 31, Assets: Accounts Receivable - Trade $ — $ 83 Total Current Assets $ — $ 83 Total Assets of Discontinued Operations $ — $ 83 Liabilities: Accounts Payable $ — $ 36 Other Current Liabilities 5,692 6,014 Total Current Liabilities $ 5,692 $ 6,050 Total Liabilities of Discontinued Operations $ 5,692 $ 6,050

Acquisitions and Dispositions (

Acquisitions and Dispositions (Notes)	6 Months Ended
	Jun. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Acquisitions And Dispositions Disclosure [Text Block]	ACQUISITIONS AND DISPOSITIONS: In June 2017, CONSOL Energy closed on the sale of approximately 11,100 net undeveloped acres of the Marcellus and Utica Shale in Allegheny, Washington, and Westmoreland counties, Pennsylvania. CONSOL Energy received total cash proceeds of $83,500 which is included in cash flows from investing activities. The net gain on the sale of these assets was $58,541 and was included in the Gain on Sale of Assets in the Consolidated Statements of Income. In June 2017, the Company finalized the sale of 12 producing wells, 15 drilled but uncompleted wells (DUCs), and approximately 11,000 net developed and undeveloped Marcellus and Utica acres in Doddridge and Wetzel Counties in West Virginia that were previously classified as Held for Sale. CONSOL Energy received total cash proceeds of $129,651 which is included in cash flows from investing activities, as well as undeveloped acreage. The net loss on the sale was $ 4,897 and was included in the Gain on Sale of Assets in the Consolidated Statements of Income. In May 2017, CONSOL Energy finalized the sale of approximately 6,300 net undeveloped acres of the Utica-Point Pleasant Shale in Jefferson, Belmont and Guernsey counties, Ohio that were previously classified as Held for Sale. CONSOL Energy received total cash proceeds of $76,696 which is included in cash flows from investing activities. The net gain on the sale of these assets was $72,457 and was included in the Gain on Sale of Assets in the Consolidated Statements of Income. In April 2017, CONSOL Energy finalized the sale of its Knox Energy LLC and Coalfield Pipeline Company subsidiaries that were previously classified as Held for Sale. At closing, CONSOL Energy received net cash proceeds of $18,944 which is included in cash flows from investing activities. Due to various post closing adjustments, the net gain on the sale of these assets was $606 and was included in the Gain on Sale of Assets in the Consolidated Statements on Income.

Other Income (Notes)

Other Income (Notes)	6 Months Ended
	Jun. 30, 2017
Component of Operating Income [Abstract]
Other Income and Other Expense Disclosure [Text Block]	For the Three Months Ended For the Six Months Ended June 30, June 30, 2017 2016 2017 2016 Equity in Earnings of Affiliates - CONE $ 9,996 $ 8,205 $ 21,934 $ 22,556 Interest Income 6,533 547 8,076 761 Royalty Income - Non-Operated Coal 3,498 2,423 12,283 4,653 Rental Income 2,833 9,079 11,675 18,275 Purchased Coal Sales 2,558 604 6,099 604 Gathering Revenue 2,548 2,648 5,701 5,396 Right of Way Issuance 771 2,070 1,772 17,803 Equity in Earnings of Affiliates - Other 59 1,014 451 3,328 Coal Contract Buyout — 6,288 — 6,288 Other 5,141 758 6,642 2,102 Miscellaneous Other Income $ 33,937 $ 33,636 $ 74,633 $ 81,766

Pension and OPEB - Periodic Cos

Pension and OPEB - Periodic Cost	6 Months Ended
	Jun. 30, 2017
PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS NET PERIODIC BENEFIT COSTS: [Abstract]
Components of Pension and Other Postretirement Benefit Plans:	COMPONENTS OF PENSION AND OTHER POST-EMPLOYMENT BENEFIT (OPEB) PLANS NET PERIODIC BENEFIT COSTS: Components of Net Periodic Benefit (Credit) Cost are as follows: Pension Benefits Other Post-Employment Benefits For the Three Months Ended June 30, For the Six Months Ended June 30, For the Three Months Ended June 30, For the Six Months Ended June 30, 2017 2016 2017 2016 2017 2016 2017 2016 Service Cost $ 846 $ 482 $ 1,691 $ 963 $ — $ — $ — $ — Interest Cost 6,428 6,841 12,856 13,683 5,986 6,060 11,972 12,121 Expected Return on Plan Assets (10,596 ) (11,869 ) (21,191 ) (23,738 ) — — — — Amortization of Prior Service Credits (148 ) (148 ) (295 ) (295 ) (601 ) — (1,203 ) — Recognized Net Actuarial Loss 2,351 2,116 4,701 4,232 5,778 4,792 11,556 9,584 Settlement Loss — 13,696 — 13,696 — — — — Net Periodic Benefit (Credit) Cost $ (1,119 ) $ 11,118 $ (2,238 ) $ 8,541 $ 11,163 $ 10,852 $ 22,325 $ 21,705

CWP and Workers Comp - Net Peri

CWP and Workers Comp - Net Periodic Costs	6 Months Ended
	Jun. 30, 2017
CWP And Workers Comp Net Periodic Cost [Abstract]
Coal Workers' Pneumoconiosis (CWP) and Workers' Compensation:	COMPONENTS OF COAL WORKERS’ PNEUMOCONIOSIS (CWP) AND WORKERS’ COMPENSATION NET PERIODIC BENEFIT COSTS: Components of Net Periodic Benefit Cost are as follows: CWP Workers' Compensation For the Three Months Ended June 30, For the Six Months Ended June 30, For the Three Months Ended June 30, For the Six Months Ended June 30, 2017 2016 2017 2016 2017 2016 2017 2016 Service Cost $ 1,129 $ 1,041 $ 2,259 $ 2,244 $ 1,463 $ 1,904 $ 2,926 $ 3,809 Interest Cost 1,013 1,053 2,025 2,176 592 638 1,184 1,275 Amortization of Actuarial Gain (1,908 ) (1,188 ) (3,816 ) (2,571 ) (153 ) (101 ) (305 ) (202 ) Administrative Fees 151 — 303 — 138 — 275 — State Administrative Fees and Insurance Bond Premiums — — — — 590 968 1,388 1,699 Curtailment Gain — — — (1,307 ) — — — — Net Periodic Benefit Cost $ 385 $ 906 $ 771 $ 542 $ 2,630 $ 3,409 $ 5,468 $ 6,581 Income attributable to discontinued operations included in the CWP net periodic cost above was $1,290 for the six months ended June 30, 2016 and was included in Loss from Discontinued Operations, net on the Consolidated Statements of Income. On March 31, 2016, CONSOL Energy completed the sale of its membership interests in BMC (See Note 2 - Discontinued Operations). As a result of the sale, certain obligations of the CWP plan were transferred to the buyer. This transfer triggered a curtailment gain of $1,307 which was included in Loss from Discontinued Operations, net on the Consolidated Statements of Income. The curtailment resulted in a plan remeasurement which increased the plan liabilities by $7,713 at March 31, 2016.

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES: The effective tax rate for the three and six months ended June 30, 2017 was 28.3% and 9.2% , respectively. The effective tax rate differs from the U.S. federal statutory rate of 35% primarily due to the income tax benefit for excess percentage depletion. The effective tax rate for the three and six months ended June 30, 2016 was 30.0% and 30.8% , respectively. The effective tax rate differs from the U.S. federal statutory rate of 35% primarily due to charges to record state valuation allowances and the effects of the 2010-2013 Federal tax audit still in progress in 2016, partially offset by a larger anticipated book loss and the income tax benefit for excess percentage depletion. The total amount of uncertain tax positions at June 30, 2017 and December 31, 2016 was $8,437 and $9,103 , respectively. If these uncertain tax positions were recognized, there would be no effect on CONSOL Energy's effective tax rate at June 30, 2017 and December 31, 2016 . CONSOL Energy recognizes accrued interest related to uncertain tax positions in interest expense. As of June 30, 2017 and December 31, 2016 , the Company reported an accrued interest liability relating to uncertain tax positions of $461 and $305 , respectively, in Other Liabilities on the Consolidated Balance Sheets. The accrued interest liability includes $156 of accrued interest expense that is reflected in the Company's Consolidated Statements of Income for the six months ended June 30, 2017 . CONSOL Energy recognizes penalties accrued related to uncertain tax positions in its income tax expense. As of June 30, 2017 and December 31, 2016 , CONSOL Energy had no accrued liabilities for tax penalties related to uncertain tax positions. CONSOL Energy and its subsidiaries file federal income tax returns with the United States and tax returns within various states and Canadian jurisdictions. With few exceptions, the Company is no longer subject to United States federal, state, local, or non-U.S. income tax examinations by tax authorities for the years before 2010. The Company expects the Joint Committee on Taxation to conclude its review of the audit of tax years 2010 through 2014 in the third quarter of 2017.

Inventories

Inventories	6 Months Ended
	Jun. 30, 2017
Inventory Disclosure [Abstract]
Inventories	INVENTORIES: Inventory components consist of the following: June 30, December 31, Coal $ 17,170 $ 7,800 Supplies 57,795 57,661 Total Inventories $ 74,965 $ 65,461 Inventories are stated at the lower of cost or net realizable value. The cost of coal inventories is determined by the first-in, first-out (FIFO) method. Coal inventory costs include labor, supplies, equipment costs, operating overhead, depreciation, depletion and amortization, and other related costs. The cost of supplies inventory is determined by the average cost method and includes operating and maintenance supplies to be used in the Company's E&P and coal operations.

Property, Plant and Equipment

Property, Plant and Equipment	6 Months Ended
	Jun. 30, 2017
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	PROPERTY, PLANT AND EQUIPMENT: June 30, December 31, E&P Property, Plant and Equipment Intangible drilling cost $ 3,552,047 $ 3,583,565 Proved gas properties 1,967,327 2,016,916 Unproved gas properties 1,031,106 1,116,282 Gas gathering equipment 1,133,382 1,138,299 Gas wells and related equipment 790,635 791,996 Other gas assets 189,783 190,406 Gas advance royalties 13,353 13,762 Total E&P Property, Plant and Equipment $ 8,677,633 $ 8,851,226 Less: Accumulated Depreciation, Depletion and Amortization 3,216,357 3,106,296 Total E&P Property, Plant and Equipment - Net $ 5,461,276 $ 5,744,930 PA Mining Operations Property, Plant and Equipment Coal and other plant and equipment $ 2,330,678 $ 2,307,668 Coal properties and surface lands 458,788 458,398 Airshafts 374,956 371,752 Mine development 326,152 326,152 Coal advance mining royalties 16,240 16,224 Leased coal lands 26,556 26,566 Total PA Mining Operations and Other Property, Plant and Equipment $ 3,533,370 $ 3,506,760 Less: Accumulated Depreciation, Depletion and Amortization 1,850,348 1,768,712 Total PA Mining Operations and Other Property, Plant and Equipment - Net $ 1,683,022 $ 1,738,048 Other Property, Plant and Equipment Coal and other plant and equipment 528,397 532,919 Coal properties and surface lands 480,307 481,126 Airshafts 10,003 10,003 Mine development 17,988 17,988 Coal advance mining royalties 311,285 310,530 Leased coal lands 60,836 60,836 Total Other Property, Plant and Equipment $ 1,408,816 $ 1,413,402 Less: Accumulated Depreciation, Depletion and Amortization 758,896 755,941 Total Other Property, Plant and Equipment - Net $ 649,920 $ 657,461 Total Company Property, Plant and Equipment - Continuing Operations $ 13,619,819 $ 13,771,388 Less - Total Company Accumulated Depreciation, Depletion and Amortization 5,825,601 5,630,949 Total Property, Plant and Equipment of Continuing Operations - Net $ 7,794,218 $ 8,140,439 Impairment of Long-Lived Assets In February 2017, the Company approved a plan to sell subsidiaries Knox Energy LLC and Coalfield Pipeline Company (collectively, “Knox”). Knox met all of the criteria to be classified as held for sale in February 2017. The potential disposal of Knox did not represent a strategic shift that will have a major effect on the Company’s operations and financial results and is, therefore, not classified as discontinued operations in accordance with ASU 2014-08, Presentation of Financial Statements (Topic 205) and Property, Plant and Equipment (Topic 360). As part of the required evaluation under the held for sale guidance, the asset’s book value is to be evaluated and adjusted to the lower of its carrying amount or fair value less cost to sell. The Company determined that the approximate fair value less costs to sell Knox was less than the carrying value of the net assets which resulted in an impairment of $137,865 in the six months ended June 30, 2017, included in Impairment of Exploration and Production Properties within the Other Gas segment of the Consolidated Statements of Income. The sale of Knox closed in the second quarter of 2017 (See Note 3 - Acquisitions and Dispositions for more information). Industry Participation Agreements CONSOL Energy had two significant industry participation agreements (referred to as "joint ventures" or "JVs") that provided drilling and completion carries for the Company's retained interests. CNX Gas Company is party to a joint development agreement with Hess Ohio Developments, LLC (Hess) with respect to approximately 155 thousand net Utica Shale acres in Ohio in which each party has a 50% undivided interest. Under the agreement, as amended, Hess was obligated to pay a total of approximately $335,000 in the form of a 50% drilling carry of certain CONSOL Energy working interest obligations as the acreage is developed. As of December 31, 2016, Hess' entire carry obligation has been met. CNX Gas Company was party to a joint development agreement with Noble Energy, Inc. (Noble) with respect to approximately 700 thousand net Marcellus Shale oil and gas acres in West Virginia and Pennsylvania, in which each party owned a 50% undivided interest. On October 29, 2016, CNX Gas entered into an Exchange Agreement with Noble Energy, which terminated the joint development agreement related to the jointly owned gas assets held in connection with the joint venture with Noble and divided such jointly owned gas assets among CNX Gas and Noble Energy. The transactions contemplated by the Exchange Agreement were closed on December 1, 2016 with an effective date of October 1, 2016. As part of the exchange: each party now owns and operates a 100% interest in properties and wells in two separate operating areas; each party has independent control and flexibility with respect to the scope and timing of future development over its operating area; and all acreage operated by CONSOL Energy and Noble Energy, Inc. in their respective operating areas will remain fully dedicated to CONE Midstream Partners LP. The exchange was accounted for as a mineral conveyance, thus no gain or loss was recorded in connection with the transaction. On June 28, 2017, Noble Energy announced that it has closed on a transaction divesting its upstream assets in northern West Virginia and southern Pennsylvania to HG Energy II Appalachia, LLC, a portfolio company of Quantum Energy Partners.

Short-Term Notes Payable

Short-Term Notes Payable	6 Months Ended
	Jun. 30, 2017
Short-term Debt, Other Disclosures [Abstract]
Short-Term Notes Payable:	SHORT-TERM NOTES PAYABLE: CONSOL Energy's senior secured credit agreement expires on June 18, 2019. The credit facility allows for up to $ 2,000,000 of borrowings, which includes a $ 750,000 letters of credit sub-limit. CONSOL Energy can also request an additional $ 500,000 increase in the aggregate borrowing limit amount. The facility is secured by substantially all of the assets of CONSOL Energy and certain of its subsidiaries. Fees and interest rate spreads are based on the percentage of facility utilization, measured quarterly. Availability under the facility is limited to a borrowing base, which is determined by the lenders syndication agent and approved by the required number of lenders in good faith by calculating a value of CONSOL Energy's proved natural gas reserves. The current facility contains a number of affirmative and negative covenants that limit the Company's ability to dispose of assets, make investments, purchase or redeem CONSOL Energy common stock, pay dividends, merge with another corporation and amend, modify or restate the senior unsecured notes. In April 2016, the facility was amended to require that the Company must: (i) prepay outstanding loans under the revolving credit facility to the extent that cash on hand exceeds $150,000 for two consecutive business days; (ii) mortgage 85% of its proved reserves and 80% of its proved developed producing reserves, in each case, which are included in the borrowing base; (iii) maintain applicable deposit, securities and commodities accounts with the lenders or affiliates thereof; and (iv) enter into control agreements with respect to such applicable accounts. In addition, the Company pledged the equity interest it holds in CONE Gathering, LLC, and CONE Midstream Partners, LP as collateral to secure loans under the credit agreement. The facility also requires that CONSOL Energy maintain a minimum interest coverage ratio of no less than 2.50 to 1.00, which is calculated as the ratio of Adjusted EBITDA to cash interest expense of CONSOL Energy and certain of its subsidiaries, measured quarterly. CONSOL Energy must also maintain a minimum current ratio of no less than 1.00 to 1.00, which is calculated as the ratio of current assets, plus revolver availability, to current liabilities, excluding borrowings under the revolver, measured quarterly. At June 30, 2017 , the interest coverage ratio was 5.00 to 1.00 and the current ratio was 3.28 to 1.00. Further, the credit facility allows unlimited investments in joint ventures for the development and operation of natural gas gathering systems and permits CONSOL Energy to separate its E&P and coal businesses if the leverage ratio (which is, essentially, the ratio of debt to EBITDA) of the E&P business immediately after the separation would not be greater than 2.75 to 1.00. The calculation of all of the ratios exclude CNX Coal Resources LP ("CNXC"). At June 30, 2017 , the $2,000,000 facility had no borrowings outstanding and $ 313,760 of letters of credit outstanding, leaving $ 1,686,240 of unused capacity. At December 31, 2016 , the $2,000,000 facility had no borrowings outstanding and $ 325,676 of letters of credit outstanding, leaving $ 1,674,324 of unused capacity.

Long-Term Debt

Long-Term Debt	6 Months Ended
	Jun. 30, 2017
Long-term Debt, Other Disclosures [Abstract]
Long-term Debt	LONG-TERM DEBT: June 30, December 31, Debt: Senior Notes due April 2022 at 5.875% (Principal of $1,730,975 and $1,850,000 plus Unamortized Premium of $4,012 and $4,731, respectively) $ 1,734,987 $ 1,854,731 Senior Notes due April 2023 at 8.00% (Principal of $500,000 less Unamortized Discount of $5,204 and $5,656, respectively) 494,796 494,344 Revolving Credit Facility - CNX Coal Resources LP 190,000 201,000 MEDCO Revenue Bonds in Series due September 2025 at 5.75% 102,865 102,865 Senior Notes due April 2020 at 8.25%, Issued at Par Value 74,470 74,470 Senior Notes due March 2021 at 6.375%, Issued at Par Value 20,611 20,611 Advance Royalty Commitments (7.73% Weighted Average Interest Rate) 2,678 2,678 Other Long-Term Note Maturing in 2018 (Principal of $1,073 and $1,789 less Unamortized Discount of $47 and $117, respectively) 1,026 1,672 Less: Unamortized Debt Issuance Costs 24,054 27,699 2,597,379 2,724,672 Less: Amounts Due in One Year* 1,324 1,677 Long-Term Debt $ 2,596,055 $ 2,722,995 * Excludes current portion of Capital Lease Obligations of $10,061 and $ 10,323 at June 30, 2017 and December 31, 2016 , respectively.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	COMMITMENTS AND CONTINGENT LIABILITIES: CONSOL Energy and its subsidiaries are subject to various lawsuits and claims with respect to such matters as personal injury, wrongful death, damage to property, exposure to hazardous substances, governmental regulations including environmental remediation, employment and contract disputes and other claims and actions arising out of the normal course of business. CONSOL Energy accrues the estimated loss for these lawsuits and claims when the loss is probable and can be estimated. The Company's current estimated accruals related to these pending claims, individually and in the aggregate, are immaterial to the financial position, results of operations or cash flows of CONSOL Energy. It is possible that the aggregate loss in the future with respect to these lawsuits and claims could ultimately be material to the financial position, results of operations or cash flows of CONSOL Energy; however, such amounts cannot be reasonably estimated. The amount claimed against CONSOL Energy is disclosed below when an amount is expressly stated in the lawsuit or claim, which is not often the case. The following lawsuits and claims include those for which a loss is probable and an accrual has been recognized: Hale Litigation: This class action lawsuit was filed on September 23, 2010 in the U.S. District Court in Abingdon, Virginia. The putative class consists of force-pooled unleased gas owners whose ownership of the coalbed methane (CBM) gas was declared to be in conflict with rights of others. The lawsuit seeks a judicial declaration of ownership of the CBM and damages based on allegations CNX Gas Company failed to either pay royalties due to conflicting claimants or deemed lessors or paid them less than required because of the alleged practice of improper below market sales and/or taking alleged improper post-production deductions. On September 30, 2013, the District Judge entered an Order certifying the class, and CNX Gas Company appealed the Order to the U.S. Fourth Circuit Court of Appeals. On August 19, 2014, the Fourth Circuit agreed with CNX Gas Company, reversed the Order certifying the class and remanded the case to the trial court for further proceedings consistent with the decision. On April 23, 2015, Plaintiffs filed a Renewed Motion for Class Certification, which CNX opposed. On March 29, 2017, the Court issued an Order certifying four issues for class treatment: (1) allegedly excessive deductions; (2) royalties based on purported improperly low prices; (3) deduction of severance taxes; and (4) Plaintiffs' request for an accounting. On April 13, 2017, CNX filed a Petition for Allowance of Appeal with the Fourth Circuit, and on May 22, 2017 the Petition was denied. The case is now back in the trial court for further proceedings. CONSOL Energy continues to believe this action cannot properly proceed as a class action in any form, believes the case has meritorious defenses, and intends to defend it vigorously. The Company has established an accrual to cover its estimated liability for this case. This accrual is immaterial to the overall financial position of CONSOL Energy and is included in Other Accrued Liabilities on the Consolidated Balance Sheets. Addison Litigation: This class action lawsuit was filed on April 28, 2010 in the U.S. District Court in Abingdon, Virginia. The putative class consists of gas lessors whose gas ownership is in conflict. The lawsuit seeks a judicial declaration of ownership of the CBM and damages based on the allegations that CNX Gas Company failed to either pay royalties due to these conflicting claimant lessors or paid them less than required because of the alleged practice of improper below market sales and/or taking alleged improper post-production deductions. On September 30, 2013, the District Judge entered an Order certifying the class, and CNX Gas Company appealed the Order to the U.S. Fourth Circuit Court of Appeals. On August 19, 2014, the Fourth Circuit agreed with CNX Gas Company, reversed the Order certifying the class and remanded the case to the trial court for further proceedings consistent with the decision. On April 23, 2015, Plaintiffs filed a Renewed Motion for Class Certification, which CNX opposed. On March 29, 2017, the Court issued an Order denying class certification in this matter. CONSOL Energy believes the case has meritorious defenses, and intends to defend it vigorously. The Company has established an accrual to cover its estimated liability for this case. This accrual is immaterial to the overall financial position of CONSOL Energy and is included in Other Accrued Liabilities on the Consolidated Balance Sheets. The following royalty, land rights and other lawsuits and claims include those for which a loss is reasonably possible, but not probable, and accordingly, an accrual has not been recognized. These claims are influenced by many factors which prevent the estimation of a range of potential loss. These factors include, but are not limited to, generalized allegations of unspecified damages (such as improper deductions), discovery having not commenced or not having been completed, unavailability of expert reports on damages and non-monetary issues being tried. For example, in instances where a gas lease termination is sought, damages would depend on speculation as to if and when the gas production would otherwise have occurred, how many wells would have been drilled on the lease premises, what their production would be, what the cost of production would be, and what the price of gas would be during the production period. An estimate is calculated, if applicable, when sufficient information becomes available. Fitzwater Litigation: Three nonunion retired coal miners have sued CONSOL Energy Inc., Fola Coal Company (AMVEST), Consolidation Coal Company and CONSOL of Kentucky Inc. (COK) in West Virginia Federal Court alleging ERISA violations in the termination of retiree health care benefits. The Plaintiffs contend they relied to their detriment on oral statements and promises of "lifetime health benefits" allegedly made by various members of management during Plaintiffs' employment and that they were allegedly denied access to Summary Plan Documents that clearly reserved to the Company the right to modify or terminate the CONSOL Energy Inc. Retiree Health and Welfare Plan. Pursuant to plaintiffs amended complaint filed on April 24, 2017, plaintiffs request that retiree health benefits be reinstated and seek to represent a class of all nonunion retirees who were associated with AMVEST and COK areas of operation.The Company believes it has meritorious defense and intends to vigorously defend this suit. At June 30, 2017 , CONSOL Energy has provided the following financial guarantees, unconditional purchase obligations and letters of credit to certain third parties, as described by major category in the following table. These amounts represent the maximum potential of total future payments that the Company could be required to make under these instruments. These amounts have not been reduced for potential recoveries under recourse or collateralization provisions. Generally, recoveries under reclamation bonds would be limited to the extent of the work performed at the time of the default. No amounts related to these financial guarantees and letters of credit are recorded as liabilities in the financial statements. CONSOL Energy management believes that these guarantees will expire without being funded, and therefore the commitments will not have a material adverse effect on financial condition. Amount of Commitment Expiration Per Period Total Amounts Committed Less Than 1 Year 1-3 Years 3-5 Years Beyond 5 Years Letters of Credit: Employee-Related $ 83,836 $ 39,934 $ 43,902 $ — $ — Environmental 998 998 — — — Other 228,926 195,113 33,813 — — Total Letters of Credit 313,760 236,045 77,715 — — Surety Bonds: Employee-Related 112,460 112,460 — — — Environmental 511,621 505,923 5,698 — — Other 21,658 19,624 2,033 1 — Total Surety Bonds 645,739 638,007 7,731 1 — Guarantees: Other 38,373 10,227 16,426 10,840 880 Total Guarantees 38,373 10,227 16,426 10,840 880 Total Commitments $ 997,872 $ 884,279 $ 101,872 $ 10,841 $ 880 Included in the above table are commitments and guarantees entered into in conjunction with the sale of Consolidation Coal Company and certain of its subsidiaries, which contain all five of its longwall coal mines in West Virginia, and its river operations to a subsidiary of Murray Energy Corporation (Murray Energy). As part of the sales agreement, CONSOL Energy has guaranteed certain equipment lease obligations and coal sales agreements that were assumed by Murray Energy. In the event that Murray Energy would default on the obligations defined in the agreements, CONSOL Energy would be required to perform under the guarantees. If CONSOL Energy would be required to perform, the stock purchase agreement provides various recourse actions. At June 30, 2017 and December 31, 2016, the fair value of these guarantees was $1,285 and $1,362 , respectively, and is included in Other Accrued Liabilities on the Consolidated Balance Sheets. The fair value of certain of the guarantees was determined using CONSOL Energy’s risk-adjusted interest rate. Significant increases or decreases in the risk-adjusted interest rates may result in a significantly higher or lower fair value measurement. Coal sales agreement guarantees were valued based on an evaluation of coal market pricing compared to contracted sales price and includes an adjustment for nonperformance risk. No other amounts related to financial guarantees and letters of credit are recorded as liabilities in the financial statements. Significant judgment is required in determining the fair value of these guarantees. The guarantees of the leases and sales agreements are classified within Level 3 of the fair value hierarchy. As part of the sale of the Buchanan Mine (See Note 2 - Discontinued Operations), CONSOL Energy has guaranteed certain equipment lease obligations that were assumed by Coronado. In the event that Coronado would default on the obligations defined in the agreements, CONSOL Energy would be required to perform under the guarantees. CONSOL Energy regularly evaluates the likelihood of default for all guarantees based on an expected loss analysis and records the fair value, if any, of its guarantees as an obligation in the consolidated financial statements. CONSOL Energy and CNX Gas Company enter into long-term unconditional purchase obligations to procure major equipment purchases, natural gas firm transportation, gas drilling services and other operating goods and services. These purchase obligations are not recorded on the Consolidated Balance Sheets. As of June 30, 2017 , the purchase obligations for each of the next five years and beyond were as follows: Obligations Due Amount Less than 1 year $ 197,860 1 - 3 years 276,358 3 - 5 years 247,277 More than 5 years 569,703 Total Purchase Obligations $ 1,291,198

Derivative Instruments

Derivative Instruments	6 Months Ended
	Jun. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments:	DERIVATIVE INSTRUMENTS: CONSOL Energy enters into financial derivative instruments to manage its exposure to commodity price volatility. These natural gas and NGL commodity hedges are accounted for on a mark-to-market basis with changes in fair value recorded in current period earnings. CONSOL Energy is exposed to credit risk in the event of non-performance by counterparties. The creditworthiness of counterparties is subject to continuing review. The Company has not experienced any issues of non-performance by derivative counterparties. None of the Company's counterparty master agreements currently require CONSOL Energy to post collateral for any of its positions. However, as stated in the counterparty master agreements, if CONSOL Energy's obligations with one of its counterparties cease to be secured on the same basis as similar obligations with the other lenders under the credit facility, CONSOL Energy would have to post collateral for instruments in a liability position in excess of defined thresholds. All of the Company's derivative instruments are subject to master netting arrangements with our counterparties. CONSOL Energy recognizes all financial derivative instruments as either assets or liabilities at fair value on the Consolidated Balance Sheets on a gross basis. Each of CONSOL Energy's counterparty master agreements allows, in the event of default, the ability to elect early termination of outstanding contracts. If early termination is elected, CONSOL Energy and the applicable counterparty would net settle all open hedge positions. The total notional amounts of production of CONSOL Energy's derivative instruments at June 30, 2017 and December 31, 2016 were as follows: June 30, December 31, Forecasted to 2017 2016 Settle Through Natural Gas Commodity Swaps (Bcf) 840.9 744.7 2021 Natural Gas Basis Swaps (Bcf) 506.2 482.0 2021 Propane Commodity Swaps (Mbbls) — 126.0 — The gross fair value of CONSOL Energy's derivative instruments at June 30, 2017 and December 31, 2016 was as follows: Asset Derivative Instruments Liability Derivative Instruments June 30, December 31, June 30, December 31, 2017 2016 2017 2016 Commodity Swaps: Prepaid Expense $ 26,606 $ 16 Other Accrued Liabilities $ 61,803 $ 209,980 Other Assets 50,897 29,596 Other Liabilities 29,172 67,139 Total Asset $ 77,503 $ 29,612 Total Liability $ 90,975 $ 277,119 Basis Only Swaps: Prepaid Expense $ 12,871 $ 56,916 Other Accrued Liabilities $ 39,853 $ 21,593 Other Assets 11,811 35,603 Other Liabilities 18,799 11,575 Total Asset $ 24,682 $ 92,519 Total Liability $ 58,652 $ 33,168 The effect of derivative instruments on CONSOL Energy's Consolidated Statements of Income was as follows: For the Three Months Ended For the Six Months Ended June 30, June 30, 2017 2016 2017 2016 Cash (Paid) Received in Settlement of Commodity Derivative Instruments: Commodity Swaps: Natural Gas $ (15,509 ) $ 91,302 $ (40,116 ) $ 173,449 Propane — (114 ) (1,216 ) (114 ) Natural Gas Basis Swaps (16,776 ) (10,853 ) (38,056 ) (8,669 ) Total Cash (Paid) Received in Settlement of Commodity Derivative Instruments (32,285 ) 80,335 (79,388 ) 164,666 Unrealized Gain (Loss) on Commodity Derivative Instruments: Commodity Swaps: Natural Gas 70,282 (306,376 ) 232,886 (344,398 ) Propane — (526 ) 1,147 (792 ) Natural Gas Basis Swaps 45,791 9,463 (93,320 ) 3,042 Reclassified from Accumulated OCI — 17,724 — 33,162 Total Unrealized Gain (Loss) on Commodity Derivative Instruments 116,073 (279,715 ) 140,713 (308,986 ) Gain (Loss) on Commodity Derivative Instruments: Commodity Swaps: Natural Gas 54,773 (215,074 ) 192,770 (170,949 ) Propane — (640 ) (69 ) (906 ) Natural Gas Basis Swaps 29,015 (1,390 ) (131,376 ) (5,627 ) Reclassified from Accumulated OCI — 17,724 — 33,162 Total Gain (Loss) on Commodity Derivative Instruments $ 83,788 $ (199,380 ) $ 61,325 $ (144,320 ) Changes in Accumulated OCI, net of tax, attributable to cash flow hedges that were de-designated at December 31, 2014 were as follows: For the Three Months Ended For the Six Months Ended June 30, 2016 June 30, 2016 Beginning Balance – Accumulated OCI $ 33,656 $ 43,470 Less: Gain Reclassified from Accumulated OCI (Net of tax: $6,521, $12,145) 11,203 21,017 Ending Balance – Accumulated OCI $ 22,453 $ 22,453 The Company also enters into fixed price natural gas sales agreements that are satisfied by physical delivery. These physical commodity contracts qualify for the normal purchases and sales exception and are not subject to derivative instrument accounting.

Fair Value of Financial Instrum

Fair Value of Financial Instruments	6 Months Ended
	Jun. 30, 2017
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	FAIR VALUE OF FINANCIAL INSTRUMENTS: CONSOL Energy determines the fair value of assets and liabilities based on the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants. The fair values are based on assumptions that market participants would use when pricing an asset or liability, including assumptions about risk and the risks inherent in valuation techniques and the inputs to valuations. The fair value hierarchy is based on whether the inputs to valuation techniques are observable or unobservable. Observable inputs reflect market data obtained from independent sources (including NYMEX forward curves, LIBOR-based discount rates and basis forward curves), while unobservable inputs reflect the Company's own assumptions of what market participants would use. The fair value hierarchy includes three levels of inputs that may be used to measure fair value as described below: Level One - Quoted prices for identical instruments in active markets. Level Two - The fair value of the assets and liabilities included in Level 2 are based on standard industry income approach models that use significant observable inputs, including NYMEX forward curves, LIBOR-based discount rates and basis forward curves. Level Three - Unobservable inputs significant to the fair value measurement supported by little or no market activity. The significant unobservable inputs used in the fair value measurement of the Company's third-party guarantees are the credit risk of the third-party and the third-party surety bond markets. A significant increase or decrease in these values, in isolation, would have a directionally similar effect resulting in higher or lower fair value measurement of the Company's Level 3 guarantees. In those cases when the inputs used to measure fair value meet the definition of more than one level of the fair value hierarchy, the lowest level input that is significant to the fair value measurement in its totality determines the applicable level in the fair value hierarchy. The financial instruments measured at fair value on a recurring basis are summarized below: Fair Value Measurements at June 30, 2017 Fair Value Measurements at December 31, 2016 Description (Level 1) (Level 2) (Level 3) (Level 1) (Level 2) (Level 3) Gas Derivatives $ — $ (47,442 ) $ — $ — $ (188,156 ) $ — Murray Energy Guarantees $ — $ — $ (1,285 ) $ — $ — $ (1,362 ) The following methods and assumptions were used to estimate the fair value for which the fair value option was not elected: Cash and cash equivalents: The carrying amount reported in the Consolidated Balance Sheets for cash and cash equivalents approximates its fair value due to the short-term maturity of these instruments. Long-term debt: The fair value of long-term debt is measured using unadjusted quoted market prices or estimated using discounted cash flow analyses. The discounted cash flow analyses are based on current market rates for instruments with similar cash flows. The carrying amounts and fair values of financial instruments for which the fair value option was not elected are as follows: June 30, 2017 December 31, 2016 Carrying Amount Fair Value Carrying Amount Fair Value Cash and Cash Equivalents $ 299,135 $ 299,135 $ 60,475 $ 60,475 Long-Term Debt $ 2,621,433 $ 2,610,785 $ 2,752,371 $ 2,717,582

Segment Information

Segment Information	6 Months Ended
	Jun. 30, 2017
Segment Reporting Information [Line Items]
Segment Reporting Disclosure [Text Block]	SEGMENT INFORMATION: CONSOL Energy consists of two principal business divisions: Exploration and Production (E&P) and Pennsylvania (PA) Mining Operations. The principal activity of the E&P division, which includes four reportable segments, is to produce pipeline quality natural gas for sale primarily to gas wholesalers. The E&P division's reportable segments are Marcellus Shale, Utica Shale, Coalbed Methane, and Other Gas. The Other Gas segment is primarily related to shallow oil and gas production which is not significant to the Company. It also includes the Company's purchased gas activities, unrealized gain or loss on commodity derivative instruments, exploration and production related other costs, other corporate expenses, selling, general and administrative activities, as well as various other activities assigned to the E&P division but not allocated to each individual segment. The principal activities of the PA Mining Operations division are mining, preparation and marketing of thermal coal, sold primarily to power generators. It also includes selling, general and administrative activities, as well as various other activities assigned to the PA Mining Operations division. CONSOL Energy’s Other division includes expenses from various corporate and diversified business activities that are not allocated to the E&P or PA Mining Operations divisions. The diversified business activities include CNX Marine Terminal, closed and idle mine activities, water operations, selling, general and administrative activities, as well as various other non-operated activities, none of which are individually significant to the Company. Prior to the sale of the Buchanan Mine on March 31, 2016 and the Miller Creek and Fola Complexes on August 1, 2016 (see Note 2 - Discontinued Operations), CONSOL Energy had a Coal division. The Coal division had three reportable segments; PA Operations, Virginia (VA) Operations and Other Coal. The VA Operations segment included the Buchanan Mine and the Other Coal segment was primarily comprised of the assets and operations of the Miller Creek and Fola Complexes, as well as coal terminal operations, closed and idle mine activities, selling, general and administrative activities and various other non-operated activities. PA Operations now constitutes its own division and reportable segment, and the remaining activity in the Other Coal segment became part of CONSOL Energy's diversified business activities in the Other division. In the preparation of the following information, intersegment sales have been recorded at amounts approximating market. Operating profit for each segment is based on sales less identifiable operating and non-operating expenses. Assets are reflected at the division level for E&P and are not allocated between each individual E&P segment. These assets are not allocated to each individual segment due to the diverse asset base controlled by CONSOL Energy, whereby each individual asset may service more than one segment within the division. An allocation of such asset base would not be meaningful or representative on a segment by segment basis.

Related Party Transaction

Related Party Transaction	6 Months Ended
	Jun. 30, 2017
NOTE 16- RELATED PARTY TRANSACTIONS [Abstract]
Related Party Transactions Disclosure [Text Block]	RELATED PARTY TRANSACTIONS: CONE Gathering LLC and CONE Midstream Partners LP In September 2011, CNX Gas Company, a wholly owned subsidiary of CONSOL Energy, and Noble Energy, Inc. (Noble Energy), an unrelated third-party, formed CONE Gathering LLC (CONE) to develop and operate each company's gas gathering system needs in the Marcellus Shale play. CONSOL Energy accounts for CNX Gas Company's 50% ownership interest in CONE under the equity method of accounting. In May 2014, CONSOL Energy and Noble Energy (collectively, the "Sponsors") formed CONE Midstream Partners LP (the Partnership), a master limited partnership, to own, operate, develop and acquire natural gas gathering and other midstream energy assets to service each company's production in the Marcellus Shale in Pennsylvania and West Virginia. The Partnership's general partner is CONE Midstream GP LLC, a wholly owned subsidiary of CONE. In September 2014, the Partnership closed its initial public offering (IPO) of 20,125,000 common units representing limited partnership interests, which included a 2,625,000 common unit over-allotment option that was exercised in full by the underwriters. Following the IPO, CONE had a 2% general partner interest in the Partnership, while each sponsor had a 32.1% limited partner interest. CONSOL Energy accounts for CNX Gas Company's portion of the earnings in the Partnership under the equity method of accounting. In November 2016, the Partnership acquired from CONE an additional 25% ownership interest in CONE Midstream DevCo 1 LP, commonly referred to as the "Anchor Systems." The transaction included a total purchase consideration of $ 248,000 , comprised of $ 140,000 in cash and issuance of approximately 5,200,000 common limited partnership units to the Sponsors. Following the acquisition, CONE continues to have a 2% general partner interest in the Partnership, while each Sponsor's limited partner interest increased to 33.5%. At June 30, 2017 , CNX Gas Company and Noble Energy each continue to own a 50% interest in the assets of CONE that were not contributed to the Partnership. On June 28, 2017, Noble Energy announced that a sale of its interest in CONE to a portfolio company of Quantum Energy Partners is expected to occur in the third quarter of 2017. The following is a summary of the Company's Investment in Affiliates balances included within the Consolidated Balance Sheets associated with CONE and the Partnership, respectively: CONE The Partnership Total Balance at December 31, 2016 $ 151,075 $ 18,133 $ 169,208 Equity in Earnings 2,150 19,784 21,934 Distributions (12,672 ) (12,028 ) (24,700 ) Balance at June 30, 2017 $ 140,553 $ 25,889 $ 166,442 The following transactions were included within Miscellaneous Other Income and Transportation, Gathering and Compression within the Consolidated Statements of Income: For the Three Months Ended June 30, For the Six Months Ended June 30, 2017 2016 2017 2016 Miscellaneous Other Income: Equity in Earnings of Affiliates - CONE $ 284 $ 753 $ 2,150 $ 7,146 Equity in Earnings of Affiliates - the Partnership $ 9,712 $ 7,452 $ 19,784 $ 15,410 Transportation, Gathering and Compression: Gathering Services - CONE $ 232 $ 152 $ 485 $ 369 Gathering Services - the Partnership $ 31,695 $ 29,565 $ 65,749 $ 61,210 At June 30, 2017 and December 31, 2016 , CONSOL Energy had a net payable of $ 7,885 and $ 5,815 respectively, due to both the Partnership and CONE primarily for accrued but unpaid gathering services. CNX Coal Resources LP In July 2015, CNXC closed its IPO of 5,000,000 common units representing limited partnership interests at a price to the public of $15.00 per unit. Additionally, Greenlight Capital entered into a common unit purchase agreement with CNXC pursuant to which Greenlight Capital agreed to purchase, and CNXC agreed to sell, 5,000,000 common units at a price per unit equal to $15.00 , which equates to $75,000 in net proceeds. CNXC's general partner is CNX Coal Resources GP, a wholly owned subsidiary of CONSOL Energy. The underwriters of the IPO filing exercised an over-allotment option of 561,067 common units to the public at $15.00 per unit. In connection with the IPO, CNXC entered into a $400,000 senior secured revolving credit facility with certain lenders and PNC Bank, National Association (PNC), as administrative agent. Obligations under the revolving credit facility are guaranteed by CNXC's subsidiaries (the "guarantor subsidiaries") and are secured by substantially all of CNXC's and CNXC's subsidiaries' assets pursuant to a security agreement and various mortgages. Under the new revolving credit facility, CNXC made an initial draw of $200,000 , and after origination fees of $3,000 , the net proceeds were $197,000 . The total net proceeds related to these transactions that were distributed to CONSOL Energy were $342,711 . In September 2016, CNXC and its wholly owned subsidiary, CNX Thermal Holdings LLC (CNX Thermal), entered into a Contribution Agreement with CONSOL Energy, CONSOL Pennsylvania Coal Company LLC and Conrhein Coal Company (the Contributing Parties) under which CNX Thermal acquired an additional 5% undivided interest in and to the Pennsylvania Mine Complex, in exchange for (i) cash consideration in the amount of $21,500 and (ii) CNXC's issuance of 3,956,496 Class A Preferred Units representing limited partner interests in CNXC at an issue price of $17.01 per Class A preferred Unit (the "Class A Preferred Unit Issue Price"), or an aggregate $67,300 in equity consideration. The Class A Preferred Unit Issue Price was calculated as the volume-weighted average trading price of CNXC's common units (the "Common Units") over the trailing 15-day trading period ending on September 29, 2016 (or $14.79 per unit), plus a 15% premium. In connection with CNXC's Contribution Agreement, in September 2016, the General Partner and CNXC entered into the First Amended and Restated Omnibus Agreement (the "Amended Omnibus Agreement") with CONSOL Energy and certain of its subsidiaries. Under the Amended Omnibus Agreement, CONSOL Energy indemnified CNXC for certain liabilities. The Amended Omnibus Agreement also amended CNXC's obligations to CONSOL Energy with respect to the payment of an annual administrative support fee and reimbursement for the provisions of certain management and operating services provided, in each case to reflect structural changes in how those services are provided to CNXC by CONSOL Energy. Charges for services from CONSOL Energy include the following: For the Three Months Ended June 30, For the Six Months Ended June 30, 2017 2016 2017 2016 Operating and Other Costs $ 867 $ 1,270 $ 1,739 $ 2,536 Selling, General and Administrative Expenses 737 1,190 1,454 2,305 Total Services from CONSOL Energy $ 1,604 $ 2,460 $ 3,193 $ 4,841 At June 30, 2017 and December 31, 2016, CNXC had a net payable to CONSOL Energy in the amount of $2,196 and $1,666 , respectively. This payable includes reimbursements for business expenses, executive fees, stock-based compensation and other items under the omnibus agreement.

Recent Accounting Pronouncement

Recent Accounting Pronouncements (Notes)	6 Months Ended
	Jun. 30, 2017
Accounting Changes and Error Corrections [Abstract]
New Accounting Pronouncements, Policy [Policy Text Block]	RECENT ACCOUNTING PRONOUNCEMENTS: In May 2017, the FASB issued Update 2017-09 - Compensation - Stock Compensation (Topic 718): Scope of Modification Accounting, which reduces diversity in practice and cost and complexity when applying the guidance in this Topic to a change to the terms or conditions of a share-based payment award. The amendments in this Update provide guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting in Topic 718. The amendments in the Update are effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years, and should be applied prospectively to an award modified on or after the adoption date. Early adoption is permitted. The adoption of this guidance is not expected to have a material impact on CONSOL Energy's financial statements. In March 2017, the FASB issued Update 2017-07 - Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost, which improves the presentation of net periodic pension cost and net periodic postretirement benefit cost. The amendments in the Update require that an employer report the service cost component in the same line item as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit cost are required to be presented separately from the service cost component and outside a subtotal of income from operations, if one is presented. Because CONSOL Energy does not present an income from operations subtotal, that requirement is not applicable. Additionally, the Company's service cost component is deemed immaterial, and therefore, the other components of net benefit cost will not be presented separately. For public entities, the amendments in this Update are effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Early adoption is permitted as of the beginning of a fiscal year for which financial statements have not been issued. The adoption of this guidance is not expected to have an impact on CONSOL Energy's financial statements. In August 2016, the FASB issued Update 2016-15 - Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments, which addresses eight specific cash flow issues with the objective of reducing the existing diversity in practice. The amendments relate to debt prepayment or debt extinguishment costs, settlement of zero-coupon debt instruments or other debt instruments with coupon interest rates that are insignificant in relation to the effective interest rate of the borrowing, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims, proceeds from the settlement of corporate-owned life insurance policies, distributions received from equity method investees, and beneficial interests in securitization transactions. The Update also states that, in the absence of specific guidance for cash receipts and payments that have aspects of more than one class of cash flows, an entity should classify each separately identifiable source or use within the cash receipts and payments on the basis of their nature in financing, investing, or operating activities. In situations in which cash receipts or payments cannot be separated by source or use, the appropriate classification should depend on the activity that is likely to be the predominant source or use of cash flows for the item. The amendments in the Update will be applied using a retrospective transition method to each period presented and, for public entities, are effective for fiscal years beginning after December 15, 2017 and interim periods within those fiscal years. Early adoption is permitted, including adoption in an interim period. The Company is currently evaluating the impact this guidance may have on CONSOL Energy's financial statements. In May 2014, the FASB issued Update 2014-09 - Revenue from Contracts with Customers (Topic 606), which supersedes the revenue recognition requirements in Topic 605 - Revenue Recognition and most industry-specific guidance throughout the Industry Topics of the Codification. The objective of the amendments in this Update is to improve financial reporting by creating common revenue recognition guidance for U.S. GAAP and International Financial Reporting Standards (IFRS). The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services and should disclose sufficient information, both qualitative and quantitative, to enable users of financial statements to understand the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. The following updates to Topic 606 were made during 2016: • In March 2016, the FASB issued Update 2016-08 - Principal versus Agent Considerations (Reporting Revenue Gross versus Net), which clarifies how an entity determines whether it is a principal or an agent for goods or services promised to a customer as well as the nature of the goods or services promised to their customers. • In April 2016, the FASB issued Update 2016-10 - Revenue from Contracts with Customers: Identifying Performance Obligations and Licensing, which seeks to address implementation issues in the areas of identifying performance obligations and licensing. • In May 2016, the FASB issued Update 2016-12 - Revenue from Contracts with Customers: Narrow Scope Improvements and Practical Expedients, which seeks to address implementation issues in the areas of collectibility, presentation of sales taxes, noncash consideration, and completed contracts and contract modifications at transition. • In December 2016, the FASB issued Update 2016-20 - Technical Corrections and Improvements to Topic 606, Revenue from Contracts with Customers, which includes amendments related to loan guarantee fees, contract costs, provisions for losses on construction and production-type contracts, scope, disclosures, contract modification, contract asset versus receivable, refund liability and advertising costs. The new standards are effective for annual reporting periods beginning after December 15, 2017, with the option to adopt as early as annual reporting periods beginning after December 15, 2016. Management continues to evaluate the impact that these standards will have on CONSOL Energy's financial statements, specifically as it relates to contracts that contain positive electric power price related adjustments. CONSOL Energy anticipates using the modified retrospective approach to adoption as it relates to ASU 2014-09. CONSOL Energy is currently performing a detailed analysis at the individual contract level and will continue to evaluate the impact on the financial statements which is expected to be immaterial. In February 2016, the FASB issued Update 2016-02 - Leases (Topic 842), which increases transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. Update 2016-02 does retain a distinction between finance leases and operating leases, which is substantially similar to the classification criteria for distinguishing between capital leases and operating leases in the previous lease guidance. Retaining this distinction allows the recognition, measurement and presentation of expenses and cash flows arising from a lease to not significantly change from previous GAAP. For leases with a term of 12 months or less, a lessee is permitted to make an accounting policy election by class of underlying asset not to recognize lease assets and lease liabilities, but to recognize lease expense on a straight-line basis over the lease term. For both financing and operating leases, the right-to-use asset and lease liability will be initially measured at the present value of the lease payments in the statement of financial position.The accounting applied by a lessor is largely unchanged from that applied under previous GAAP. For public business entities, the amendments in this Update are effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early application is permitted. In transition, lessees and lessors are required to recognize and measure leases at the beginning of the earliest period presented using a modified retrospective approach. CONSOL Energy is currently reviewing all existing leases an agreements that are covered by this standard and will continue to evaluate the impact on the financial statements and related disclosures.

Subsequent Event (Notes)

Subsequent Event (Notes)	6 Months Ended
	Jun. 30, 2017
Subsequent Event [Line Items]
Subsequent Events [Text Block]	SUBSEQUENT EVENTS: In May 2017, the Company sent notices to call the remaining $ 74,470 balance on its 8.25% senior notes due in April 2020 and the remaining $ 20,611 balance on its 6.375% senior notes due in March 2021. The call price was $101.375 for the 8.25% senior notes due in April 2020 and $102.125 for the 6.375% senior notes due in March 2021. The redemption occurred on July 14, 2017.

Basis of Presentation (Tables)

Basis of Presentation (Tables)	6 Months Ended
	Jun. 30, 2017
BASIS OF PRESENTATION: [Abstract]
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	he computations for basic and dilutive earnings per share are as follows: For the Three Months Ended June 30, For the Six Months Ended June 30, 2017 2016 2017 2016 Numerator: Income (Loss) from Continuing Operations $ 173,823 $ (234,044 ) $ 140,321 $ (277,340 ) Less: Net Income Attributable to Non-Controlling Interest 4,313 1,179 9,777 2,293 Net Income (Loss) from Continuing Operations Attributable to CONSOL Energy Shareholders $ 169,510 $ (235,223 ) $ 130,544 $ (279,633 ) Loss from Discontinued Operations — (234,605 ) — (287,772 ) Net Income (Loss) Attributable to CONSOL Energy Shareholders $ 169,510 $ (469,828 ) $ 130,544 $ (567,405 ) Denominator: Weighted-average shares of common stock outstanding 230,058,422 229,409,325 229,938,462 229,334,277 Effect of dilutive shares 2,139,974 — 2,286,571 — Weighted-average diluted shares of common stock outstanding 232,198,396 229,409,325 232,225,033 229,334,277 Earnings (Loss) per Share: Basic (Continuing Operations) $ 0.74 $ (1.03 ) $ 0.57 $ (1.22 ) Basic (Discontinued Operations) — (1.02 ) — (1.25 ) Total Basic $ 0.74 $ (2.05 ) $ 0.57 $ (2.47 ) Dilutive (Continuing Operations) $ 0.73 $ (1.03 ) $ 0.56 $ (1.22 ) Dilutive (Discontinued Operations) — (1.02 ) — (1.25 ) Total Dilutive $ 0.73 $ (2.05 ) $ 0.56 $ (2.47 )
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]	The table below sets forth the share-based awards that have been excluded from the computation of the diluted earnings per share because their effect would be anti-dilutive: For the Three Months Ended June 30, For the Six Months Ended June 30, 2017 2016 2017 2016 Anti-Dilutive Options 2,360,197 6,348,665 2,360,197 6,348,665 Anti-Dilutive Restricted Stock Units 194,071 742,868 190,658 742,868 Anti-Dilutive Performance Share Units 1,284,924 951,541 1,284,924 951,541 Anti-Dilutive Performance Stock Options 802,804 802,804 802,804 802,804 4,641,996 8,845,878 4,638,583 8,845,878
Schedule of Changes in Accumulated Other Comprehensive Income/(Loss) by Component [Table Text Block]	Changes in Accumulated Other Comprehensive Loss by component, net of tax, were as follows: Long-Term Liabilities Balance at December 31, 2016 $ (392,556 ) Amounts Reclassified from Accumulated Other Comprehensive Loss 6,966 Add: Other Comprehensive Loss Attributable to Non-Controlling Interest 23 Balance at June 30, 2017 $ (385,567 )
Schedule of Reclassification of Adjustments to Accumulated Other Comprehensive Income [Table Text Block]	The following table shows the reclassification of adjustments out of Accumulated Other Comprehensive Loss: For the Three Months Ended June 30, For the Six Months Ended June 30, 2017 2016 2017 2016 Derivative Instruments (Note 13) Natural Gas Price Swaps and Options $ — $ (17,724 ) $ — $ (33,162 ) Tax Expense — 6,521 — 12,145 Net of Tax $ — $ (11,203 ) $ — $ (21,017 ) Actuarially Determined Long-Term Liability Adjustments* (Note 5 and Note 6) Amortization of Prior Service Costs $ (749 ) $ (148 ) $ (1,498 ) $ (295 ) Recognized Net Actuarial Loss 6,247 5,706 12,550 11,217 Settlement Loss — 13,696 — 13,696 Total 5,498 19,254 11,052 24,618 Tax Benefit (2,034 ) (7,178 ) (4,086 ) (9,196 ) Net of Tax $ 3,464 $ 12,076 $ 6,966 $ 15,422
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]	The table below sets forth the share-based awards that have been exercised or released: For the Three Months Ended June 30, For the Six Months Ended June 30, 2017 2016 2017 2016 Options 28,838 — 90,462 — Restricted Stock Units 221 83,710 334,261 568,390 Performance Share Units — — 560,936 — 29,059 83,710 985,659 568,390

Pension and OPEB - Periodic C29

Pension and OPEB - Periodic Cost (Tables)	6 Months Ended
	Jun. 30, 2017
PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS NET PERIODIC BENEFIT COSTS: [Abstract]
Components of Net Periodic Costs	Components of Net Periodic Benefit (Credit) Cost are as follows: Pension Benefits Other Post-Employment Benefits For the Three Months Ended June 30, For the Six Months Ended June 30, For the Three Months Ended June 30, For the Six Months Ended June 30, 2017 2016 2017 2016 2017 2016 2017 2016 Service Cost $ 846 $ 482 $ 1,691 $ 963 $ — $ — $ — $ — Interest Cost 6,428 6,841 12,856 13,683 5,986 6,060 11,972 12,121 Expected Return on Plan Assets (10,596 ) (11,869 ) (21,191 ) (23,738 ) — — — — Amortization of Prior Service Credits (148 ) (148 ) (295 ) (295 ) (601 ) — (1,203 ) — Recognized Net Actuarial Loss 2,351 2,116 4,701 4,232 5,778 4,792 11,556 9,584 Settlement Loss — 13,696 — 13,696 — — — — Net Periodic Benefit (Credit) Cost $ (1,119 ) $ 11,118 $ (2,238 ) $ 8,541 $ 11,163 $ 10,852 $ 22,325 $ 21,705

CWP and Workers Comp - Net Pe30

CWP and Workers Comp - Net Periodic Costs (Tables)	6 Months Ended
	Jun. 30, 2017
CWP And Workers Comp Net Periodic Cost [Abstract]
Schedule Of Postemployment Benefits Disclosure [Text Block]	Components of Net Periodic Benefit Cost are as follows: CWP Workers' Compensation For the Three Months Ended June 30, For the Six Months Ended June 30, For the Three Months Ended June 30, For the Six Months Ended June 30, 2017 2016 2017 2016 2017 2016 2017 2016 Service Cost $ 1,129 $ 1,041 $ 2,259 $ 2,244 $ 1,463 $ 1,904 $ 2,926 $ 3,809 Interest Cost 1,013 1,053 2,025 2,176 592 638 1,184 1,275 Amortization of Actuarial Gain (1,908 ) (1,188 ) (3,816 ) (2,571 ) (153 ) (101 ) (305 ) (202 ) Administrative Fees 151 — 303 — 138 — 275 — State Administrative Fees and Insurance Bond Premiums — — — — 590 968 1,388 1,699 Curtailment Gain — — — (1,307 ) — — — — Net Periodic Benefit Cost $ 385 $ 906 $ 771 $ 542 $ 2,630 $ 3,409 $ 5,468 $ 6,581

Inventories (Tables)

Inventories (Tables)	6 Months Ended
	Jun. 30, 2017
Inventory Disclosure [Abstract]
Inventory components	June 30, December 31, Coal $ 17,170 $ 7,800 Supplies 57,795 57,661 Total Inventories $ 74,965 $ 65,461

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	6 Months Ended
	Jun. 30, 2017
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	June 30, December 31, E&P Property, Plant and Equipment Intangible drilling cost $ 3,552,047 $ 3,583,565 Proved gas properties 1,967,327 2,016,916 Unproved gas properties 1,031,106 1,116,282 Gas gathering equipment 1,133,382 1,138,299 Gas wells and related equipment 790,635 791,996 Other gas assets 189,783 190,406 Gas advance royalties 13,353 13,762 Total E&P Property, Plant and Equipment $ 8,677,633 $ 8,851,226 Less: Accumulated Depreciation, Depletion and Amortization 3,216,357 3,106,296 Total E&P Property, Plant and Equipment - Net $ 5,461,276 $ 5,744,930 PA Mining Operations Property, Plant and Equipment Coal and other plant and equipment $ 2,330,678 $ 2,307,668 Coal properties and surface lands 458,788 458,398 Airshafts 374,956 371,752 Mine development 326,152 326,152 Coal advance mining royalties 16,240 16,224 Leased coal lands 26,556 26,566 Total PA Mining Operations and Other Property, Plant and Equipment $ 3,533,370 $ 3,506,760 Less: Accumulated Depreciation, Depletion and Amortization 1,850,348 1,768,712 Total PA Mining Operations and Other Property, Plant and Equipment - Net $ 1,683,022 $ 1,738,048 Other Property, Plant and Equipment Coal and other plant and equipment 528,397 532,919 Coal properties and surface lands 480,307 481,126 Airshafts 10,003 10,003 Mine development 17,988 17,988 Coal advance mining royalties 311,285 310,530 Leased coal lands 60,836 60,836 Total Other Property, Plant and Equipment $ 1,408,816 $ 1,413,402 Less: Accumulated Depreciation, Depletion and Amortization 758,896 755,941 Total Other Property, Plant and Equipment - Net $ 649,920 $ 657,461 Total Company Property, Plant and Equipment - Continuing Operations $ 13,619,819 $ 13,771,388 Less - Total Company Accumulated Depreciation, Depletion and Amortization 5,825,601 5,630,949 Total Property, Plant and Equipment of Continuing Operations - Net $ 7,794,218 $ 8,140,439

Long-Term Debt (Tables)

Long-Term Debt (Tables)	6 Months Ended
	Jun. 30, 2017
Long-term Debt, Other Disclosures [Abstract]
Schedule of Long-term Debt	June 30, December 31, Debt: Senior Notes due April 2022 at 5.875% (Principal of $1,730,975 and $1,850,000 plus Unamortized Premium of $4,012 and $4,731, respectively) $ 1,734,987 $ 1,854,731 Senior Notes due April 2023 at 8.00% (Principal of $500,000 less Unamortized Discount of $5,204 and $5,656, respectively) 494,796 494,344 Revolving Credit Facility - CNX Coal Resources LP 190,000 201,000 MEDCO Revenue Bonds in Series due September 2025 at 5.75% 102,865 102,865 Senior Notes due April 2020 at 8.25%, Issued at Par Value 74,470 74,470 Senior Notes due March 2021 at 6.375%, Issued at Par Value 20,611 20,611 Advance Royalty Commitments (7.73% Weighted Average Interest Rate) 2,678 2,678 Other Long-Term Note Maturing in 2018 (Principal of $1,073 and $1,789 less Unamortized Discount of $47 and $117, respectively) 1,026 1,672 Less: Unamortized Debt Issuance Costs 24,054 27,699 2,597,379 2,724,672 Less: Amounts Due in One Year* 1,324 1,677 Long-Term Debt $ 2,596,055 $ 2,722,995

Commitments and Contingencies (

Commitments and Contingencies (Tables)	6 Months Ended
	Jun. 30, 2017
Long-term Purchase Commitment [Table Text Block]	At June 30, 2017 , CONSOL Energy has provided the following financial guarantees, unconditional purchase obligations and letters of credit to certain third parties, as described by major category in the following table. These amounts represent the maximum potential of total future payments that the Company could be required to make under these instruments. These amounts have not been reduced for potential recoveries under recourse or collateralization provisions. Generally, recoveries under reclamation bonds would be limited to the extent of the work performed at the time of the default. No amounts related to these financial guarantees and letters of credit are recorded as liabilities in the financial statements. CONSOL Energy management believes that these guarantees will expire without being funded, and therefore the commitments will not have a material adverse effect on financial condition. Amount of Commitment Expiration Per Period Total Amounts Committed Less Than 1 Year 1-3 Years 3-5 Years Beyond 5 Years Letters of Credit: Employee-Related $ 83,836 $ 39,934 $ 43,902 $ — $ — Environmental 998 998 — — — Other 228,926 195,113 33,813 — — Total Letters of Credit 313,760 236,045 77,715 — — Surety Bonds: Employee-Related 112,460 112,460 — — — Environmental 511,621 505,923 5,698 — — Other 21,658 19,624 2,033 1 — Total Surety Bonds 645,739 638,007 7,731 1 — Guarantees: Other 38,373 10,227 16,426 10,840 880 Total Guarantees 38,373 10,227 16,426 10,840 880 Total Commitments $ 997,872 $ 884,279 $ 101,872 $ 10,841 $ 880
Unrecorded Unconditional Purchase Obligations Disclosure	ONSOL Energy and CNX Gas Company enter into long-term unconditional purchase obligations to procure major equipment purchases, natural gas firm transportation, gas drilling services and other operating goods and services. These purchase obligations are not recorded on the Consolidated Balance Sheets. As of June 30, 2017 , the purchase obligations for each of the next five years and beyond were as follows: Obligations Due Amount Less than 1 year $ 197,860 1 - 3 years 276,358 3 - 5 years 247,277 More than 5 years 569,703 Total Purchase Obligations $ 1,291,198

Derivative Instruments (Tables)

Derivative Instruments (Tables)	6 Months Ended
	Jun. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments	were as follows: For the Three Months Ended For the Six Months Ended June 30, 2016 June 30, 2016 Beginning Balance – Accumulated OCI $ 33,656 $ 43,470 Less: Gain Reclassified from Accumulated OCI (Net of tax: $6,521, $12,145) 11,203 21,017 Ending Balance – Accumulated OCI $ 22,453 $ 22,453 The Company also enters into fixed price natural gas sales agreements that are satisfied by physical delivery. These physical commodity contracts qualify for the normal purchases and sales exception and are not subject to derivative instrument accounting.

Fair Value of Financial Instr36

Fair Value of Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2017
Fair Value Disclosures [Abstract]
Fair Value, Assets Measured on Recurring Basis [Table Text Block]	The financial instruments measured at fair value on a recurring basis are summarized below: Fair Value Measurements at June 30, 2017 Fair Value Measurements at December 31, 2016 Description (Level 1) (Level 2) (Level 3) (Level 1) (Level 2) (Level 3) Gas Derivatives $ — $ (47,442 ) $ — $ — $ (188,156 ) $ — Murray Energy Guarantees $ — $ — $ (1,285 ) $ — $ — $ (1,362 )
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Table Text Block]	June 30, 2017 December 31, 2016 Carrying Amount Fair Value Carrying Amount Fair Value Cash and Cash Equivalents $ 299,135 $ 299,135 $ 60,475 $ 60,475 Long-Term Debt $ 2,621,433 $ 2,610,785 $ 2,752,371 $ 2,717,582

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Industry segment results	Marcellus Shale Utica Shale Coalbed Methane Other Gas Total E&P PA Mining Operations Other Adjustments and Eliminations Consolidated Sales—Outside $ 154,424 $ 39,450 $ 51,974 $ 14,457 $ 260,305 $ 303,707 $ — $ — $ 564,012 (Loss) Gain on Commodity Derivative Instruments (21,545 ) (2,063 ) (6,789 ) 114,185 83,788 — — — 83,788 Other Outside Sales — — — — — — 15,974 — 15,974 Sales—Purchased Gas — — — 10,316 10,316 — — — 10,316 Freight—Outside — — — — — 17,763 — — 17,763 Intersegment Transfers — — — — — — 1,711 (1,711 ) — Total Sales and Freight $ 132,879 $ 37,387 $ 45,185 $ 138,958 $ 354,409 $ 321,470 $ 17,685 $ (1,711 ) $ 691,853 Earnings (Loss) From Continuing Operations Before Income Tax $ 16,411 $ 9,063 $ (36 ) $ 201,975 $ 227,413 $ 49,643 $ (34,529 ) $ (1,711 ) $ 240,816 (A) Segment Assets $ 5,924,105 $ 1,931,502 $ 1,163,299 $ 6,286 $ 9,025,192 (B) Depreciation, Depletion and Amortization $ 91,287 $ 41,402 $ (15,620 ) $ — $ 117,069 Capital Expenditures $ 142,304 $ 13,770 $ 4,274 $ — $ 160,348 (A) Includes equity in earnings of unconsolidated affiliates of $10,055 for Total E&P. (B) Includes investments in unconsolidated equity affiliates of $185,871 and $2,778 for Total E&P and Other, respectively.	Marcellus Shale Utica Shale Coalbed Methane Other Gas Total E&P PA Mining Operations Other Adjustments and Eliminations Consolidated Sales—Outside $ 83,651 $ 41,037 $ 33,574 $ 9,669 $ 167,931 $ 250,562 $ — $ — $ 418,493 Gain (Loss) on Commodity Derivative Instruments 48,870 10,019 16,478 (274,747 ) (199,380 ) — — — (199,380 ) Other Outside Sales — — — — — — 8,207 — 8,207 Sales—Purchased Gas — — — 7,929 7,929 — — — 7,929 Freight—Outside — — — — — 11,447 — — 11,447 Intersegment Transfers — — — — — — — — — Total Sales and Freight $ 132,521 $ 51,056 $ 50,052 $ (257,149 ) $ (23,520 ) $ 262,009 $ 8,207 $ — $ 246,696 Earnings (Loss) From Continuing Operations Before Income Tax $ 13,304 $ 9,923 $ 5,218 $ (323,028 ) $ (294,583 ) $ 22,773 $ (63,090 ) $ — $ (334,900 ) (C) Segment Assets $ 6,507,684 $ 2,029,307 $ 1,125,351 $ 122,419 $ 9,784,761 (D) Depreciation, Depletion and Amortization $ 105,151 $ 41,698 $ (11,629 ) $ — $ 135,220 Capital Expenditures $ 23,360 $ 13,099 $ 1,142 $ — $ 37,601 (C) Includes equity in earnings of unconsolidated affiliates of $9,163 and $56 for Total E&P and Other, respectively. (D) Includes investments in unconsolidated equity affiliates of $252,517 and $3,650 for Total E&P and Other, respectively.
Reconciliation of Revenue and Operating Income from Segments to Consolidated	For the Three Months Ended June 30, For the Six Months Ended June 30, 2017 2016 2017 2016 Segment Income (Loss) Before Income Taxes for reportable business segments $ 277,056 $ (271,810 ) $ 244,569 $ (271,615 ) Segment Income (Loss) Before Income Taxes for all other business segments 8,939 (15,662 ) 2,321 (32,665 ) Interest expense (43,432 ) (47,428 ) (87,865 ) (97,292 ) Eliminations (1,711 ) — (6,286 ) (424 ) (Loss) Gain on debt extinguishment (36 ) — 786 — Income (Loss) From Continuing Operations Before Income Tax $ 240,816 $ (334,900 ) $ 153,525 $ (401,996 )
Reconciliation of Assets and Liabilities from Segment to Consolidated	June 30, 2017 2016 Segment assets for total reportable business segments $ 7,855,607 $ 8,536,991 Segment assets for all other business segments 761,613 860,866 Items excluded from segment assets: Cash and other investments 292,414 88,556 Recoverable income taxes 115,558 — Deferred tax assets — 175,929 Discontinued Operations — 122,419 Total Consolidated Assets $ 9,025,192 $ 9,784,761

Guarantor Subsidiaries Financia

Guarantor Subsidiaries Financial Information (Tables)	6 Months Ended
	Jun. 30, 2017
Condensed Financial Statements, Captions [Line Items]
Guarantor FInancial Statements [Table Text Block] [Table Text Block]	Income Statement for the Three Months Ended June 30, 2016 (unaudited): Parent Issuer CNX Gas Guarantor Other Subsidiary Guarantors CNXC Other Subsidiary Non-Guarantors Elimination Consolidated Revenues and Other Income: Natural Gas, NGLs and Oil Sales $ — $ 167,931 $ — $ — $ — $ — $ 167,931 Loss on Commodity Derivative Instruments — (199,380 ) — — — — (199,380 ) Coal Sales — — 187,922 62,640 — — 250,562 Other Outside Sales — — 8,207 — — — 8,207 Purchased Gas Sales — 7,929 — — — — 7,929 Freight-Outside Coal — — 8,650 2,797 — — 11,447 Miscellaneous Other Income (431,586 ) 12,258 19,597 1,780 — 431,587 33,636 Gain on Sale of Assets — 2,247 3,367 — — — 5,614 Total Revenue and Other Income (431,586 ) (9,015 ) 227,743 67,217 — 431,587 285,946 Costs and Expenses: Exploration and Production Costs Lease Operating Expense — 23,655 — — — — 23,655 Transportation, Gathering and Compression — 90,983 — — — — 90,983 Production, Ad Valorem, and Other Fees — 6,402 — — — — 6,402 Depreciation, Depletion and Amortization — 105,151 — — — — 105,151 Exploration and Production Related Other Costs — 2,905 — — — — 2,905 Purchased Gas Costs — 8,884 — — — — 8,884 Other Corporate Expenses — 21,422 — — — — 21,422 Selling, General, and Administrative Costs — 25,411 — — — — 25,411 Total Exploration and Production Costs — 284,813 — — — — 284,813 PA Mining Operations Costs Operating and Other Costs — — 138,413 46,046 — — 184,459 Depreciation, Depletion and Amortization — — 31,276 10,422 — — 41,698 Freight Expense — — 8,650 2,797 — — 11,447 Selling, General, and Administrative Costs — — 4,810 1,969 — — 6,779 Total PA Mining Operations Costs — — 183,149 61,234 — — 244,383 Other Costs Miscellaneous Operating Expense 18,374 — 33,394 — 8 — 51,776 Selling, General, and Administrative Costs — — 4,075 — — — 4,075 Depreciation, Depletion and Amortization 149 — (11,778 ) — — — (11,629 ) Interest Expense 42,991 755 1,606 2,076 — — 47,428 Total Other Costs 61,514 755 27,297 2,076 8 — 91,650 Total Costs And Expenses 61,514 285,568 210,446 63,310 8 — 620,846 (Loss) Earnings From Continuing Operations Before Income Tax (493,100 ) (294,583 ) 17,297 3,907 (8 ) 431,587 (334,900 ) Income Tax (Benefit) Expense (23,272 ) (117,034 ) 39,453 — (3 ) — (100,856 ) (Loss) Income From Continuing Operations (469,828 ) (177,549 ) (22,156 ) 3,907 (5 ) 431,587 (234,044 ) Loss From Discontinued Operations, net — — — — (234,605 ) — (234,605 ) Net (Loss) Income (469,828 ) (177,549 ) (22,156 ) 3,907 (234,610 ) 431,587 (468,649 ) Less: Net Income Attributable to Noncontrolling Interest — — — — — 1,179 1,179 Net (Loss) Income Attributable to CONSOL Energy Shareholders $ (469,828 ) $ (177,549 ) $ (22,156 ) $ 3,907 $ (234,610 ) $ 430,408 $ (469,828 )
Guarantor Condensed Cash Flow [Table Text Block]	Cash Flow for the Six Months Ended June 30, 2016 (unaudited): Parent CNX Gas Guarantor Other Subsidiary Guarantors CNXC Non-Guarantor Other Subsidiary Non- Guarantors Elimination Consolidated Net Cash Provided by (Used in) Continuing Operating Activities $ 513,672 $ 81,153 $ 12,179 $ 24,831 $ (412,027 ) $ (13,463 ) $ 206,345 Net Cash Provided by Discontinued Operating Activities — — — — 19,053 — 19,053 Net Cash Provided by (Used in) Operating Activities $ 513,672 $ 81,153 $ 12,179 $ 24,831 $ (392,974 ) $ (13,463 ) $ 225,398 Cash Flows from Investing Activities: Capital Expenditures $ (1,899 ) $ (86,222 ) $ (20,635 ) $ (6,501 ) $ — $ — $ (115,257 ) Proceeds From Sales of Assets — 13,700 4,565 19 — — 18,284 Net Investments in Equity Affiliates — (5,578 ) — — — — (5,578 ) Net Cash Used in Continuing Investing Activities (1,899 ) (78,100 ) (16,070 ) (6,482 ) — — (102,551 ) Net Cash Provided by Discontinued Investing Activities — — — — 394,511 — 394,511 Net Cash (Used in) Provided by Investing Activities $ (1,899 ) $ (78,100 ) $ (16,070 ) $ (6,482 ) $ 394,511 $ — $ 291,960 Cash Flows from Financing Activities: Payments on Short-Term Borrowings $ (486,000 ) $ — $ — $ — $ — $ — $ (486,000 ) Payments on Miscellaneous Borrowings (803 ) (3,053 ) (568 ) (35 ) — — (4,459 ) Net Proceeds from Revolver - CNX Coal Resources LP — — — 13,000 — — 13,000 Distributions to Noncontrolling Interest — — — (24,288 ) — 13,463 (10,825 ) Net Change in Parent Advancements — — (4,597 ) — 4,597 — Dividends Paid (2,294 ) — — — — — (2,294 ) Issuance of Common Stock 4 — — — — — 4 Treasury Stock Activity (1,657 ) — — — — — (1,657 ) Net Cash (Used in) Provided by Continuing Financing Activities (490,750 ) (3,053 ) (568 ) (15,920 ) — 18,060 (492,231 ) Net Cash Used in Discontinued Financing Activities — — — — (75 ) — (75 ) Net Cash (Used in) Provided by Financing Activities $ (490,750 ) $ (3,053 ) $ (568 ) $ (15,920 ) $ (75 ) $ 18,060 $ (492,306 )
Guarantor Condensed Comprehensive Income [Table Text Block]	Statement of Comprehensive Income for the Three Months Ended June 30, 2016 (unaudited): Parent CNX Gas Guarantor Other Subsidiary Guarantors CNXC Non- Guarantor Other Subsidiary Non- Guarantors Elimination Consolidated Net (Loss) Income $ (469,828 ) $ (177,549 ) $ (22,156 ) $ 3,907 $ (234,610 ) $ 431,587 $ (468,649 ) Other Comprehensive (Loss) Income: Actuarially Determined Long-Term Liability Adjustments 8,045 — 8,067 (22 ) — (8,045 ) 8,045 Reclassification of Cash Flow Hedges from OCI to Earnings (11,203 ) (11,203 ) — — — 11,203 (11,203 ) Other Comprehensive (Loss) Income: (3,158 ) (11,203 ) 8,067 (22 ) — 3,158 (3,158 ) Comprehensive (Loss) Income (472,986 ) (188,752 ) (14,089 ) 3,885 (234,610 ) 434,745 (471,807 ) Less: Comprehensive Income Attributable to Noncontrolling Interest — — — — — 1,179 1,179 Comprehensive (Loss) Income Attributable to CONSOL Energy Inc. Shareholders $ (472,986 ) $ (188,752 ) $ (14,089 ) $ 3,885 $ (234,610 ) $ 433,566 $ (472,986 )
Guarantor Balance Sheet [Table Text Block]	Balance Sheet at December 31, 2016 : Parent Issuer CNX Gas Guarantor Other Subsidiary Guarantors CNXC Non-Guarantor Other Subsidiary Non- Guarantors Elimination Consolidated Assets: Current Assets: Cash and Cash Equivalents $ 49,722 $ 83 $ — $ 9,785 $ 885 $ — $ 60,475 Accounts and Notes Receivable: Trade — 124,509 72,295 23,418 — — 220,222 Other Receivables 20,097 34,773 14,516 515 — — 69,901 Inventories — 15,301 38,669 11,491 — — 65,461 Recoverable Income Taxes 175,877 (59,026 ) — — — — 116,851 Prepaid Expenses 12,828 60,500 16,306 3,512 — — 93,146 Current Assets of Discontinued Operations — — — — 83 — 83 Total Current Assets 258,524 176,140 141,786 48,721 968 — 626,139 Property, Plant and Equipment: Property, Plant and Equipment 114,611 8,851,226 3,928,861 876,690 — — 13,771,388 Less-Accumulated Depreciation, Depletion and Amortization 84,788 3,106,296 1,997,687 442,178 — — 5,630,949 Total Property, Plant and Equipment-Net 29,823 5,744,930 1,931,174 434,512 — — 8,140,439 Other Assets: Deferred Income Taxes 25,904 (21,614 ) — — — — 4,290 Investment in Affiliates 7,974,260 188,376 27,269 — — (7,998,941 ) 190,964 Other 19,960 67,096 114,030 21,063 — — 222,149 Total Other Assets 8,020,124 233,858 141,299 21,063 — (7,998,941 ) 417,403 Total Assets $ 8,308,471 $ 6,154,928 $ 2,214,259 $ 504,296 $ 968 $ (7,998,941 ) $ 9,183,981 Liabilities and Equity: Current Liabilities: Accounts Payable $ 48,666 $ 127,309 $ 36,039 $ 18,797 $ — $ 10,805 $ 241,616 Accounts Payable (Recoverable)-Related Parties 1,832,908 1,034,138 (2,648,416 ) 1,666 (209,491 ) (10,805 ) — Current Portion of Long-Term Debt 1,533 6,369 4,010 88 — — 12,000 Other Accrued Liabilities 75,039 337,374 223,705 44,230 — — 680,348 Current Liabilities of Discontinued Operations — — — — 6,050 — 6,050 Total Current Liabilities 1,958,146 1,505,190 (2,384,662 ) 64,781 (203,441 ) — 940,014 Long-Term Debt: 2,421,511 26,884 115,685 197,989 — — 2,762,069 Deferred Credits and Other Liabilities: Postretirement Benefits Other Than Pensions — — 659,474 — — — 659,474 Pneumoconiosis Benefits — — 106,016 2,057 — — 108,073 Mine Closing — — 209,384 9,247 — — 218,631 Gas Well Closing — 195,704 27,549 99 — — 223,352 Workers’ Compensation — — 64,187 3,090 — — 67,277 Salary Retirement 112,543 — — — — — 112,543 Other 17,876 117,658 15,663 463 — — 151,660 Total Deferred Credits and Other Liabilities 130,419 313,362 1,082,273 14,956 — — 1,541,010 Total CONSOL Energy Inc. Stockholders’ Equity 3,798,395 4,309,492 3,400,963 226,570 204,409 (8,141,434 ) 3,798,395 Noncontrolling Interest — — — — — 142,493 142,493 Total Liabilities and Equity $ 8,308,471 $ 6,154,928 $ 2,214,259 $ 504,296 $ 968 $ (7,998,941 ) $ 9,183,981

Basis of Presentation Anti-Dilu

Basis of Presentation Anti-Dilutive Options and Units Exluded from Earnings Per Share (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from the computation of diluted earnings per share	4,641,996	8,845,878	4,638,583	8,845,878
Antidilutive Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from the computation of diluted earnings per share	2,360,197	6,348,665	2,360,197	6,348,665
Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from the computation of diluted earnings per share	194,071	742,868	190,658	742,868
Performance Share Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from the computation of diluted earnings per share	1,284,924	951,541	1,284,924	951,541
Performance Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from the computation of diluted earnings per share	802,804	802,804	802,804	802,804

Basis of Presentation Share-bas

Basis of Presentation Share-based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ (44)		$ 4,565
Payments Related to Tax Withholding for Share-based Compensation			$ 7,093	$ 1,657
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures	29,059	83,710	985,659	568,390
Performance Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Exercised	0	0	560,936	0
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Exercised	28,838	0	90,462	0
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Exercised	221	83,710	334,261	568,390

Basis of Presentation Earnings

Basis of Presentation Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ (44)		$ 4,565
Payments Related to Tax Withholding for Share-based Compensation			7,093	$ 1,657
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	173,823	$ (234,044)	140,321	(277,340)
Net Income (Loss) Attributable to Noncontrolling Interest	4,313	1,179	9,777	2,293
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	169,510	(235,223)	130,544	(279,633)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	0	(234,605)	0	(287,772)
Net Income (Loss)	$ 169,510	$ (469,828)	$ 130,544	$ (567,405)
Weighted average shares of common stock outstanding:
Basic	230,058,422	229,409,325	229,938,462	229,334,277
Effect of stock-based compensation awards	2,139,974	0	2,286,571	0
Dilutive	232,198,396	229,409,325	232,225,033	229,334,277
Earnings Per Share:
Income (Loss) from Continuing Operations, Per Basic Share	$ 0.74	$ (1.03)	$ 0.57	$ (1.22)
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share	0	(1.02)	0	(1.25)
Earnings Per Share, Basic	0.74	(2.05)	0.57	(2.47)
Income (Loss) from Continuing Operations, Per Diluted Share	0.73	(1.03)	0.56	(1.22)
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share	0	(1.02)	0	(1.25)
Earnings Per Share, Diluted	$ 0.73	$ (2.05)	$ 0.56	$ (2.47)

Basis of Presentation Changes i

Basis of Presentation Changes in Accumulated Other Comprehensive Income / (Loss) by component (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (385,567)		$ (385,567)		$ (392,556)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	4,302	$ 1,179	9,754	$ 2,293
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (385,567)		(385,567)		$ (392,556)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest			23
Amounts reclassified from accumulated other comprehensive income			$ 6,966

Basis of Presentation Reclassif

Basis of Presentation Reclassification of adjustments out of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Accumulated Depreciation, Depletion and Amortization, Property, Plant and Equipment, Period Increase (Decrease)	$ 22,479	$ 20,639	$ 19,220	$ 21,210
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments	0	(13,696)	0	(13,696)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax	0	(17,724)	0	(33,162)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax	0	6,521	0	12,145
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	0	(11,203)	0	(21,017)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(749)	(148)	(1,498)	(295)
Defined Benefit Plan, Amortization of Gains (Losses)	6,247	5,706	12,550	11,217
Defined Benefit Plan, Net Periodic Benefit Cost	5,498	19,254	11,052	24,618
Tax Benefit on Actuarially Determined Long-Term Liabilities	(2,034)	(7,178)	(4,086)	(9,196)
Actuarially Determined Long-Term Liability Adjustments, Net of Tax	$ 3,464	$ 12,076	$ 6,966	$ 15,422

Discontinued Operations Stateme

Discontinued Operations Statement $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017USD ($)	Jun. 30, 2016USD ($)	Jun. 30, 2017USD ($)TRate	Jun. 30, 2016USD ($)	Dec. 31, 2016USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash Paid to Close Deal	$ 28,271		$ 28,271
Escrow Deposits Related to Property Sales			$ 13,700
Royalty Percent | Rate			20.00%
Royalty Per Ton - Year 1 | T			75
Royalty Per Ton - Year 2 | T			78.75
Royalty Per Ton - Year 3 | T			82.69
Royalty Per Ton - Year 4 | T			86.82
Royalty Per Ton - Year 5 | T			91.16
Royalty Revenue	3,498	$ 2,423	$ 12,283	$ 4,653
Proceeds from Sale of Property Held-for-sale				402,799
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax				38,364
Impairment of Long-Lived Assets to be Disposed of		355,681		355,681
Disposal Group, Including Discontinued Operation, Assets, Current	0		0		$ 83
Disposal Group, Including Discontinued Operation, Liabilities, Current	5,692		5,692		6,050
Coronado [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Royalty Revenue	1,162		6,424
Buchanan and Other Assets [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal group, including discontinued operations, coal sales		19,411		95,930
Disposal Group, Including Discontinued Operations, Cargo and Freight Revenue		5		1,017
Disposal Group, Including Discontinued Operation, Other Income		2		33
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax		(100)		38,253
Disposal Group, Including Discontinued Operation, Revenue		19,518		58,727
Disposal Group, Including Discontinued Operation, Operating Expense		25,010		113,076
Disposal Group, Including Discontinued Operation, Operating Income (Loss)		(5,492)		(54,349)
Discontinued Operation, Tax Effect of Discontinued Operation		(126,568)		(122,258)
Disposal Group, Including Discontinued Operation, Operating Income (Loss)		$ (234,605)		$ (287,772)
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net	0		0		83
Disposal Group, Including Discontinued Operation, Assets, Current	0		0		83
Disposal Group, Including Discontinued Operation, Assets	0		0		83
Disposal Group, Including Discontinued Operation, Accounts Payable	0		0		36
Disposal Group, Including Discontinued Operation, Liabilities, Current	5,692		5,692		6,014
Disposal Group, Including Discontinued Operation, Liabilities	$ 5,692		$ 5,692		$ 6,050

Acquisitions and Dispositions I

Acquisitions and Dispositions Income Statement (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Gain (Loss) on Sale of Assets	$ 140,162,000	$ 5,614,000	$ 152,113,000	$ (1,662,000)
11,100 Net Undeveloped Acres [Member]
Land Sales			83,500
Gain (Loss) on Sale of Assets			58,541
15,500 Net Developed and Undeveloped Acres [Member]
Land Sales			129,651
Gain (Loss) on Sale of Assets			(4,897)
6,300 net undeveloped acres [Member]
Land Sales			76,696
Gain (Loss) on Sale of Assets			72,457
Knox and Coalfield [Member]
Land Sales			18,944
Gain (Loss) on Sale of Assets			$ 606

Other Income (Details)

Other Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Proceeds from Contributions from Affiliates	$ 59	$ 1,014	$ 451	$ 3,328
Gain (Loss) on Contract Termination	0	6,288	0	6,288
Gas Gathering, Transportation, Marketing and Processing Revenue	2,548	2,648	5,701	5,396
Rental Income, Nonoperating	2,833	9,079	11,675	18,275
Royalty Revenue	3,498	2,423	12,283	4,653
Revenue, Coal Services	2,558	604	6,099	604
Interest Income, Other	6,533	547	8,076	761
Right of Way Income	771	2,070	1,772	17,803
Other Nonoperating Income	5,141	758	6,642	2,102
Other Income (including equity earnings)	33,937	33,636	74,633	81,766
CONE [Member]
Proceeds from Contributions from Affiliates	$ 9,996	$ 8,205	$ 21,934	$ 22,556

Pension and OPEB - Periodic C47

Pension and OPEB - Periodic Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	$ (749)	$ (148)	$ (1,498)	$ (295)
Amortization of actuarial gain	6,247	5,706	12,550	11,217
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments	0	(13,696)	0	(13,696)
Defined Benefit Plan, Net Periodic Benefit Cost	5,498	19,254	11,052	24,618
Pension Plan [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	846	482	1,691	963
Interest cost	6,428	6,841	12,856	13,683
Defined Benefit Plan, Expected Return on Plan Assets	10,596	11,869	21,191	23,738
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(148)	(148)	(295)	(295)
Amortization of actuarial gain	2,351	2,116	4,701	4,232
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments	0	(13,696)	0	(13,696)
Defined Benefit Plan, Net Periodic Benefit Cost	(1,119)	11,118	(2,238)	8,541
Other Postretirement Benefit Plan [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	0	0	0	0
Interest cost	5,986	6,060	11,972	12,121
Defined Benefit Plan, Expected Return on Plan Assets	0	0	0	0
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(601)	0	(1,203)	0
Amortization of actuarial gain	5,778	4,792	11,556	9,584
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments	0	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost	$ 11,163	$ 10,852	$ 22,325	$ 21,705

CWP and Workers Comp - Net Pe48

CWP and Workers Comp - Net Periodic Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Amortization of actuarial gain	$ 6,247	$ 5,706	$ 12,550	$ 11,217
Defined Benefit Plan, Net Periodic Benefit Cost	5,498	19,254	11,052	24,618
Remeasurement of the Actuarially Determined Long-Term Liabilities				7,713
Workers Compensation [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	1,463	1,904	2,926	3,809
Interest cost	592	638	1,184	1,275
Amortization of actuarial gain	(153)	(101)	(305)	(202)
Defined Benefit Plan, Administration Expenses	138	0	275	0
Post Employment Benefit Plan, State Administrative Fees and Insurance Bond Premiums	590	968	1,388	1,699
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments	0	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost	2,630	3,409	5,468	6,581
Coal Workers Pneumoconiosis [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	1,129	1,041	2,259	2,244
Interest cost	1,013	1,053	2,025	2,176
Amortization of actuarial gain	(1,908)	(1,188)	(3,816)	(2,571)
Defined Benefit Plan, Administration Expenses	151	0	303	0
Post Employment Benefit Plan, State Administrative Fees and Insurance Bond Premiums	0	0	0	0
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments	0	0	0	1,307
Defined Benefit Plan, Net Periodic Benefit Cost	$ 385	$ 906	$ 771	542
Buchanan and Other Assets [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost				$ 1,290

Income Taxes Income Tax Reconci

Income Taxes Income Tax Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, Percent	28.30%	30.00%	9.20%	30.80%
Unrecognized Tax Benefits	$ 8,437		$ 8,437		$ 9,103
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	461		461		$ 305
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	$ 156		$ 156

Inventory Components (Details)

Inventory Components (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Coal	$ 17,170	$ 7,800
Supplies	57,795	57,661
Total Inventories	$ 74,965	$ 65,461

Property, Plant and Equipment51

Property, Plant and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Impairment of Oil and Gas Properties	$ 0	$ 137,865	$ 0	$ 137,865	$ 0
Unproven gas properties	1,031,106			1,031,106		$ 1,116,282
Drilling Cost	3,552,047			3,552,047		3,583,565
Gas gathering equipment	1,133,382			1,133,382		1,138,299
Gas wells and related equipment	790,635			790,635		791,996
Other gas assets	189,783			189,783		190,406
Gas advance royalties	13,353			13,353		13,762
Proven gas properties	1,967,327			1,967,327		2,016,916
Coal and other plant and equipment	2,330,678			2,330,678		2,307,668
Coal Lands and or Surface Rights	458,788			458,788		458,398
Property, Plant and Equipment, Other, Gross	374,956			374,956		371,752
Mine development	326,152			326,152		326,152
Coal advance mining royalties	16,240			16,240		16,224
Leased coal lands	26,556			26,556		26,566
Property, Plant and Equipment	13,619,819			13,619,819		13,771,388
Less Accumulated depreciation, depletion and amortization	5,825,601			5,825,601		5,630,949
Total Property, Plant and Equipment-Net	7,794,218			7,794,218		8,140,439
PA Operations [Member]
Property, Plant and Equipment [Line Items]
Less Accumulated depreciation, depletion and amortization	7,794,218			7,794,218		8,140,439
Other Segments [Member]
Property, Plant and Equipment [Line Items]
Coal and other plant and equipment	528,397			528,397		532,919
Coal Lands and or Surface Rights	480,307			480,307		481,126
Property, Plant and Equipment, Other, Gross	10,003			10,003		10,003
Mine development	17,988			17,988		17,988
Coal advance mining royalties	311,285			311,285		310,530
Leased coal lands	$ 60,836			$ 60,836		$ 60,836

Short-Term Notes Payable (Detai

Short-Term Notes Payable (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2017USD ($)	Dec. 31, 2016USD ($)
Short-term Debt [Line Items]
Credit facility, face amount	$ 400,000
Revolving Credit Facility [Member]
Short-term Debt [Line Items]
Credit facility, face amount	2,000,000
Line of Credit Facility, Maximum Borrowing Capacity	750,000
Additional Capacity Available On Credit Lines At Request	$ 500,000
Minimum interest coverage ratio	2.50
Interest coverage ratio	5
Current Ratio	3.28
Senior secured leverage ratio, maximum	1
Current secured leverage ratio	2.75
Letters of credit outstanding	$ 313,760	$ 325,676
Borrowings and issuance of letters of credit remaining capacity	$ 1,686,240	$ 1,674,324

Long-Term Debt (Details)

Long-Term Debt (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Debt Instrument [Line Items]
Capital Lease Obligations, Current	$ 10,061		$ 10,061		$ 10,323
Extinguishment of Debt, Amount	19,069		119,025
Long-term debt	(2,597,379)		(2,597,379)		(2,724,672)
Unamortized Debt Issuance Expense	24,054		24,054		27,699
Long-Term Debt	2,596,055		2,596,055		2,722,995
Long Term Debt, Current Maturities - Net of unamortized debt issuance costs	1,324		1,324		1,677
Gain (Loss) on Extinguishment of Debt	$ 36	$ 0	$ (786)	$ 0
Senior Notes 8.25 Percent Due April 2020 Par Value Member [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.375%		6.375%
Long-term debt					(74,470)
Senior Secured Notes Due March 2021 Par Value [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.875%		5.875%
Long-term debt					(20,611)
Senior notes due March 2021 at 6.375%
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.875%		5.875%
Senior Secured Notes Due March 2021 Par Value [Member] [Member] [Member]
Debt Instrument [Line Items]
Long-term debt	$ (1,734,987)		$ (1,734,987)		(1,854,731)
Senior Notes due April 2023 at 8.0% [Member]
Debt Instrument [Line Items]
Long-term debt	(494,796)		(494,796)		(494,344)
Baltimore Port Facility revenue bonds in series due September 2025 at 5.75%
Debt Instrument [Line Items]
Long-term debt	(102,865)		(102,865)		(102,865)
Advance royalty commitments
Debt Instrument [Line Items]
Long-term debt	(2,678)		(2,678)		(2,678)
Other long-term notes maturing at various dates through 2031
Debt Instrument [Line Items]
Long-term debt	(1,026)		(1,026)		(1,672)
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term debt	$ (190,000)		$ (190,000)		$ (201,000)

Commitments and Contingencies A

Commitments and Contingencies Additional Information (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Murray Energy [Member]
Commitments and Contingencies Disclosure [Line Items]
Contractual Obligation	$ 1,285	$ 1,362

Unrecorded Unconditional Purcha

Unrecorded Unconditional Purchase Obligation (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Loss Contingencies by Secondary Nature of Contingency [Domain]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 997,872
Loss Contingencies by Secondary Nature of Contingency [Domain] | Balance on First Anniversary [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	884,279
Loss Contingencies by Secondary Nature of Contingency [Domain] | More Than One And Within Three Years From Balance Sheet Date [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	101,872
Loss Contingencies by Secondary Nature of Contingency [Domain] | More Than Three And Within Five Years From Balance Sheet Date [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	10,841
Loss Contingencies by Secondary Nature of Contingency [Domain] | Beyond Five Years of Balance Sheet Date [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	880
Loss Contingencies by Secondary Nature of Contingency [Domain] | Standby Letters of Credit [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	313,760
Loss Contingencies by Secondary Nature of Contingency [Domain] | Standby Letters of Credit [Member] | Balance on First Anniversary [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	236,045
Loss Contingencies by Secondary Nature of Contingency [Domain] | Standby Letters of Credit [Member] | More Than One And Within Three Years From Balance Sheet Date [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	77,715
Loss Contingencies by Secondary Nature of Contingency [Domain] | Standby Letters of Credit [Member] | More Than Three And Within Five Years From Balance Sheet Date [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	0
Loss Contingencies by Secondary Nature of Contingency [Domain] | Standby Letters of Credit [Member] | Beyond Five Years of Balance Sheet Date [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	0
Loss Contingencies by Secondary Nature of Contingency [Domain] | Surety Bonds [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	645,739
Loss Contingencies by Secondary Nature of Contingency [Domain] | Surety Bonds [Member] | Balance on First Anniversary [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	638,007
Loss Contingencies by Secondary Nature of Contingency [Domain] | Surety Bonds [Member] | More Than One And Within Three Years From Balance Sheet Date [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	7,731
Loss Contingencies by Secondary Nature of Contingency [Domain] | Surety Bonds [Member] | More Than Three And Within Five Years From Balance Sheet Date [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	1
Loss Contingencies by Secondary Nature of Contingency [Domain] | Surety Bonds [Member] | Beyond Five Years of Balance Sheet Date [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	0
Loss Contingencies by Secondary Nature of Contingency [Domain] | Guarantees [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	38,373
Loss Contingencies by Secondary Nature of Contingency [Domain] | Guarantees [Member] | Balance on First Anniversary [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	10,227
Loss Contingencies by Secondary Nature of Contingency [Domain] | Guarantees [Member] | More Than One And Within Three Years From Balance Sheet Date [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	16,426
Loss Contingencies by Secondary Nature of Contingency [Domain] | Guarantees [Member] | More Than Three And Within Five Years From Balance Sheet Date [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	10,840
Loss Contingencies by Secondary Nature of Contingency [Domain] | Guarantees [Member] | Beyond Five Years of Balance Sheet Date [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	880
Other Commitments [Member] | Standby Letters of Credit [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	228,926
Other Commitments [Member] | Standby Letters of Credit [Member] | Balance on First Anniversary [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	195,113
Other Commitments [Member] | Standby Letters of Credit [Member] | More Than One And Within Three Years From Balance Sheet Date [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	33,813
Other Commitments [Member] | Standby Letters of Credit [Member] | More Than Three And Within Five Years From Balance Sheet Date [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	0
Other Commitments [Member] | Standby Letters of Credit [Member] | Beyond Five Years of Balance Sheet Date [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	0
Other Commitments [Member] | Surety Bonds [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	21,658
Other Commitments [Member] | Surety Bonds [Member] | Balance on First Anniversary [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	19,624
Other Commitments [Member] | Surety Bonds [Member] | More Than One And Within Three Years From Balance Sheet Date [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	2,033
Other Commitments [Member] | Surety Bonds [Member] | More Than Three And Within Five Years From Balance Sheet Date [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	1
Other Commitments [Member] | Surety Bonds [Member] | Beyond Five Years of Balance Sheet Date [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	0
Other Commitments [Member] | Guarantees [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	38,373
Other Commitments [Member] | Guarantees [Member] | Balance on First Anniversary [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	10,227
Other Commitments [Member] | Guarantees [Member] | More Than One And Within Three Years From Balance Sheet Date [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	16,426
Other Commitments [Member] | Guarantees [Member] | More Than Three And Within Five Years From Balance Sheet Date [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	10,840
Other Commitments [Member] | Guarantees [Member] | Beyond Five Years of Balance Sheet Date [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	880
Environment Related Commitments [Member] | Standby Letters of Credit [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	998
Environment Related Commitments [Member] | Standby Letters of Credit [Member] | Balance on First Anniversary [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	998
Environment Related Commitments [Member] | Standby Letters of Credit [Member] | More Than One And Within Three Years From Balance Sheet Date [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	0
Environment Related Commitments [Member] | Standby Letters of Credit [Member] | More Than Three And Within Five Years From Balance Sheet Date [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	0
Environment Related Commitments [Member] | Standby Letters of Credit [Member] | Beyond Five Years of Balance Sheet Date [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	0
Environment Related Commitments [Member] | Surety Bonds [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	511,621
Environment Related Commitments [Member] | Surety Bonds [Member] | Balance on First Anniversary [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	505,923
Environment Related Commitments [Member] | Surety Bonds [Member] | More Than One And Within Three Years From Balance Sheet Date [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	5,698
Environment Related Commitments [Member] | Surety Bonds [Member] | More Than Three And Within Five Years From Balance Sheet Date [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	0
Environment Related Commitments [Member] | Surety Bonds [Member] | Beyond Five Years of Balance Sheet Date [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	0
Employee Related Commitments [Member] | Standby Letters of Credit [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	83,836
Employee Related Commitments [Member] | Standby Letters of Credit [Member] | Balance on First Anniversary [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	39,934
Employee Related Commitments [Member] | Standby Letters of Credit [Member] | More Than One And Within Three Years From Balance Sheet Date [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	43,902
Employee Related Commitments [Member] | Standby Letters of Credit [Member] | More Than Three And Within Five Years From Balance Sheet Date [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	0
Employee Related Commitments [Member] | Standby Letters of Credit [Member] | Beyond Five Years of Balance Sheet Date [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	0
Employee Related Commitments [Member] | Surety Bonds [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	112,460
Employee Related Commitments [Member] | Surety Bonds [Member] | Balance on First Anniversary [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	112,460
Employee Related Commitments [Member] | Surety Bonds [Member] | More Than One And Within Three Years From Balance Sheet Date [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	0
Employee Related Commitments [Member] | Surety Bonds [Member] | More Than Three And Within Five Years From Balance Sheet Date [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	0
Employee Related Commitments [Member] | Surety Bonds [Member] | Beyond Five Years of Balance Sheet Date [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	0
Murray Energy [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Contractual Obligation	1,285	$ 1,362
Purchase Commitment [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Less than 1 year	197,860
Unrecorded Unconditional Purchase Obligation, Due within Three Years	276,358
Unrecorded Unconditional Purchase Obligation, Due within Five Years	247,277
More than 5 years	569,703
Total Purchase Obligations	$ 1,291,198

Derivative Instruments (Details

Derivative Instruments (Details) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017USD ($)MMcf	Dec. 31, 2014MMcf	Dec. 31, 2016USD ($)
Commodity Member [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MMcf	840,900,000,000	744,700,000,000
Basis Swap [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MMcf	506,200,000,000	482,000,000,000
Derivative Liability, Current | $	$ 39,853		$ 21,593
Derivative Liability, Noncurrent | $	18,799		11,575
Derivative Asset, Noncurrent | $	$ 11,811		$ 35,603
Propane [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MMcf	0	126,000

The Effect of Derivative Instru

The Effect of Derivative Instruments on the Consolidated Statement of Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Mar. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Derivative, Cash Received on Hedge	$ (32,285)	$ 80,335	$ (79,388)	$ 164,666
Accumulated Other Comprehensive Income (Loss), Net of Tax	(385,567)		(385,567)			$ (392,556)
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion		11,203		21,017
Unrealized Gain (Loss) on Derivatives and Commodity Contracts	116,073	(279,715)	140,713	(308,986)
Gain (Loss) on Hedging Activity	83,788	(199,380)	61,325	(144,320)
Basis Swap [Member]
Derivative [Line Items]
Derivative, Cash Received on Hedge	(16,776)	(10,853)	(38,056)	(8,669)
Unrealized Gain (Loss) on Derivatives and Commodity Contracts	45,791	9,463	(93,320)	3,042
Gain (Loss) on Hedging Activity	29,015	(1,390)	(131,376)	(5,627)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Derivative [Line Items]
Unrealized Gain (Loss) on Derivatives and Commodity Contracts	0	17,724	0	33,162
Gain (Loss) on Hedging Activity	0	17,724	0	33,162
Natural Gas [Member] | Swap [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax					$ 33,656	$ 43,470
Natural Gas [Member] | Commodity Member [Member]
Derivative [Line Items]
Derivative, Cash Received on Hedge	(15,509)	91,302	(40,116)	173,449
Unrealized Gain (Loss) on Derivatives and Commodity Contracts	70,282	(306,376)	232,886	(344,398)
Gain (Loss) on Hedging Activity	54,773	(215,074)	192,770	(170,949)
Natural Gas [Member] | Revenue Mineral Sales [Member] | Swap [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax		22,453		22,453
Propane [Member] | Commodity Member [Member]
Derivative [Line Items]
Derivative, Cash Received on Hedge	0	(114)	(1,216)	(114)
Unrealized Gain (Loss) on Derivatives and Commodity Contracts	0	(526)	1,147	(792)
Gain (Loss) on Hedging Activity	$ 0	$ (640)	$ (69)	$ (906)

Derivative Instruments Asset_Li

Derivative Instruments Asset/Liability Derivative Table (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Commodity Member [Member]
Derivative [Line Items]
Derivative Asset, Current	$ 26,606	$ 16
Derivative Liability, Noncurrent	29,172	67,139
Derivative Asset, Noncurrent	50,897	29,596
Derivative Liability, Current	61,803	209,980
Gas Cash Flow hedges	77,503	29,612
Derivative Liability	90,975	277,119
Basis Swap [Member]
Derivative [Line Items]
Derivative Asset, Current	12,871	56,916
Derivative Liability, Noncurrent	18,799	11,575
Derivative Asset, Noncurrent	11,811	35,603
Derivative Liability, Current	39,853	21,593
Gas Cash Flow hedges	24,682	92,519
Derivative Liability	$ 58,652	$ 33,168

Financial Instruments Measured

Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]
Gas Cash Flow hedges	$ 0	$ 0
Guarantees, Fair Value Disclosure	(1,285)	(1,362)
Significant Other Observable Inputs (Level 2)
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]
Gas Cash Flow hedges	(47,442)	(188,156)
Guarantees, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]
Gas Cash Flow hedges	0	0
Guarantees, Fair Value Disclosure	$ 0	$ 0

Fair Value of Financial Instr60

Fair Value of Financial Instruments Fair Value Disclosures (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents	$ 299,135	$ 60,475	$ 97,626	$ 72,574
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term Debt	2,597,379	2,724,672
Reported Value Measurement [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents	299,135	60,475
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term Debt	2,621,433	2,752,371
Portion at Fair Value Measurement [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents	299,135	60,475
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term Debt	$ 2,610,785	$ 2,717,582

Industry Segment Results (Detai

Industry Segment Results (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Natural Gas, NGLs and Oil Sales	$ 260,305	$ 167,931	$ 578,068	$ 349,188
Revenue Mineral Sales	564,012	418,493	1,198,223	825,914
Revenue, Net	691,853	246,696	1,337,914	738,671
Gain (Loss) on Hedging Activity	83,788	(199,380)	61,325	(144,320)
Sales Revenue, Services, Other	15,974	8,207	29,027	15,973
Revenue from Purchased Oil and Gas	10,316	7,929	19,294	16,547
Freight-Outside	17,763	11,447	30,045	24,557
Segment Reporting - Intersegment Transfers	0	0	0	0
Income (Loss) from Continuing Operations before Income Taxes, Domestic	240,816	(334,900)	153,525	(401,996)
Total Assets	9,025,192	9,784,761	9,025,192	9,784,761	$ 9,183,981
Depreciation, Depletion and Amortization	117,069	135,220	265,839	290,208
Segment Reporting - Capital Expenditures	160,348	37,601	273,326	115,257
Income (Loss) from Equity Method Investments			22,385	25,884
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue Mineral Sales	0	0	0	0
Revenue, Net	(1,711)	0	(6,286)	(424)
Gain (Loss) on Hedging Activity	0	0	0	0
Sales Revenue, Services, Other	0	0	0	0
Revenue from Purchased Oil and Gas	0	0	0	0
Freight-Outside	0	0	0	0
Segment Reporting - Intersegment Transfers	(1,711)	0	(6,286)	(424)
Income (Loss) from Continuing Operations before Income Taxes, Domestic	(1,711)	0	(6,286)	(424)
Total Assets	6,286	122,419	6,286	122,419
Depreciation, Depletion and Amortization	0	0	0	0
Segment Reporting - Capital Expenditures	0	0	0	0
Other Segments [Member]
Segment Reporting Information [Line Items]
Revenue Mineral Sales	0	0	0	0
Revenue, Net	17,685	8,207	35,313	15,973
Gain (Loss) on Hedging Activity	0	0	0	0
Sales Revenue, Services, Other	15,974	8,207	29,027	15,973
Revenue from Purchased Oil and Gas	0	0	0	0
Freight-Outside	0	0	0	0
Segment Reporting - Intersegment Transfers	1,711	0	6,286	0
Income (Loss) from Continuing Operations before Income Taxes, Domestic	(34,529)	(63,090)	(84,758)	(129,957)
Total Assets	1,163,299	1,125,351	1,163,299	1,125,351
Depreciation, Depletion and Amortization	(15,620)	(11,629)	(4,499)	(3,622)
Segment Reporting - Capital Expenditures	4,274	1,142	8,341	3,032
Income (Loss) from Equity Method Investments		56	190	1,123
Equity Method Investments	2,778	3,650	2,778	3,650
Operating Segments [Member]
Segment Reporting Information [Line Items]
Income (Loss) from Continuing Operations before Income Taxes, Domestic	277,056	(271,810)	244,569	(271,615)
Total Assets	7,855,607	8,536,991	7,855,607	8,536,991
Income (Loss) from Equity Method Investments	10,055	9,163	22,195	24,761
Equity Method Investments	185,871	252,517	185,871	252,517
Operating Segments [Member] | Gas Segment [Member]
Segment Reporting Information [Line Items]
Natural Gas, NGLs and Oil Sales	260,305	167,931	578,068	349,188
Revenue, Net	354,409	(23,520)	658,687	221,839
Gain (Loss) on Hedging Activity	83,788	(199,380)	61,325	(144,320)
Sales Revenue, Services, Other	0	0	0	0
Revenue from Purchased Oil and Gas	10,316	7,929	19,294	16,547
Freight-Outside	0	0	0	0
Segment Reporting - Intersegment Transfers	0	0	0	424
Income (Loss) from Continuing Operations before Income Taxes, Domestic	227,413	(294,583)	133,911	(317,462)
Total Assets	5,924,105	6,507,684	5,924,105	6,507,684
Depreciation, Depletion and Amortization	91,287	105,151	186,635	210,866
Segment Reporting - Capital Expenditures	142,304	23,360	243,097	86,222
Operating Segments [Member] | Marcellus Shale [Member]
Segment Reporting Information [Line Items]
Natural Gas, NGLs and Oil Sales	154,424	83,651	343,599	179,789
Revenue, Net	132,879	132,521	289,388	277,223
Gain (Loss) on Hedging Activity	(21,545)	48,870	(54,211)	97,434
Sales Revenue, Services, Other	0	0	0	0
Revenue from Purchased Oil and Gas	0	0	0	0
Freight-Outside	0	0	0	0
Segment Reporting - Intersegment Transfers	0	0	0	0
Income (Loss) from Continuing Operations before Income Taxes, Domestic	16,411	13,304	46,380	32,786
Operating Segments [Member] | Utica Shale [Member]
Segment Reporting Information [Line Items]
Natural Gas, NGLs and Oil Sales	39,450	41,037	93,118	75,298
Revenue, Net	37,387	51,056	88,367	95,326
Gain (Loss) on Hedging Activity	(2,063)	10,019	(4,751)	20,028
Sales Revenue, Services, Other	0	0	0	0
Revenue from Purchased Oil and Gas	0	0	0	0
Freight-Outside	0	0	0	0
Segment Reporting - Intersegment Transfers	0	0	0	0
Income (Loss) from Continuing Operations before Income Taxes, Domestic	9,063	9,923	26,870	13,179
Operating Segments [Member] | Coalbed Methane [Member]
Segment Reporting Information [Line Items]
Natural Gas, NGLs and Oil Sales	51,974	33,574	110,600	75,493
Revenue, Net	45,185	50,052	94,613	111,516
Gain (Loss) on Hedging Activity	(6,789)	16,478	(15,987)	35,599
Sales Revenue, Services, Other	0	0	0	0
Revenue from Purchased Oil and Gas	0	0	0	0
Freight-Outside	0	0	0	0
Segment Reporting - Intersegment Transfers	0	0	0	424
Income (Loss) from Continuing Operations before Income Taxes, Domestic	(36)	5,218	3,572	17,824
Operating Segments [Member] | Other Gas [Member]
Segment Reporting Information [Line Items]
Natural Gas, NGLs and Oil Sales	14,457	9,669	30,751	18,608
Revenue, Net	138,958	(257,149)	186,319	(262,226)
Gain (Loss) on Hedging Activity	114,185	(274,747)	136,274	(297,381)
Sales Revenue, Services, Other	0	0	0	0
Revenue from Purchased Oil and Gas	10,316	7,929	19,294	16,547
Freight-Outside	0	0	0	0
Segment Reporting - Intersegment Transfers	0	0	0	0
Income (Loss) from Continuing Operations before Income Taxes, Domestic	201,975	(323,028)	57,089	(381,251)
Operating Segments [Member] | PA Operations [Member]
Segment Reporting Information [Line Items]
Revenue Mineral Sales	303,707	250,562	620,155	476,726
Revenue, Net	321,470	262,009	650,200	501,283
Gain (Loss) on Hedging Activity	0	0	0	0
Sales Revenue, Services, Other	0	0	0	0
Revenue from Purchased Oil and Gas	0	0	0	0
Freight-Outside	17,763	11,447	30,045	24,557
Segment Reporting - Intersegment Transfers	0	0	0	0
Income (Loss) from Continuing Operations before Income Taxes, Domestic	49,643	22,773	110,658	45,847
Total Assets	1,931,502	2,029,307	1,931,502	2,029,307
Depreciation, Depletion and Amortization	41,402	41,698	83,703	82,964
Segment Reporting - Capital Expenditures	$ 13,770	$ 13,099	$ 21,888	$ 26,003

Reconciliation of Segment Infor

Reconciliation of Segment Information, Revenue and Other Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Sales Revenue, Services, Other	$ 15,974	$ 8,207	$ 29,027	$ 15,973
Revenue, Net	691,853	246,696	1,337,914	738,671
Income (Loss) from Continuing Operations before Income Taxes, Domestic	240,816	(334,900)	153,525	(401,996)
Depreciation, Depletion and Amortization	117,069	135,220	265,839	290,208
Segment Reporting - Capital Expenditures	160,348	37,601	273,326	115,257
Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Equity Method Investments	185,871	252,517	185,871	252,517
Income (Loss) from Continuing Operations before Income Taxes, Domestic	277,056	(271,810)	244,569	(271,615)
Other Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Equity Method Investments	2,778	3,650	2,778	3,650
Sales Revenue, Services, Other	15,974	8,207	29,027	15,973
Revenue, Net	17,685	8,207	35,313	15,973
Income (Loss) from Continuing Operations before Income Taxes, Domestic	(34,529)	(63,090)	(84,758)	(129,957)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	8,939	(15,662)	2,321	(32,665)
Depreciation, Depletion and Amortization	(15,620)	(11,629)	(4,499)	(3,622)
Segment Reporting - Capital Expenditures	4,274	1,142	8,341	3,032
Segment Reconciling Items [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Interest Income (Expense), Net and Other Non-operating Activity	(43,432)	(47,428)	(87,865)	(97,292)
Related Party Transaction, Expenses from Transactions with Related Party	1,711	0	6,286	(424)
Corporate and Other [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Gain (Loss) Estimates on Extinguishment of Debt	(36)	0	786	0
Intersegment Eliminations [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Sales Revenue, Services, Other	0	0	0	0
Revenue, Net	(1,711)	0	(6,286)	(424)
Income (Loss) from Continuing Operations before Income Taxes, Domestic	(1,711)	0	(6,286)	(424)
Depreciation, Depletion and Amortization	0	0	0	0
Segment Reporting - Capital Expenditures	0	0	0	0
Coalbed Methane [Member] | Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Sales Revenue, Services, Other	0	0	0	0
Revenue, Net	45,185	50,052	94,613	111,516
Income (Loss) from Continuing Operations before Income Taxes, Domestic	(36)	5,218	3,572	17,824
Utica Shale [Member] | Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Sales Revenue, Services, Other	0	0	0	0
Revenue, Net	37,387	51,056	88,367	95,326
Income (Loss) from Continuing Operations before Income Taxes, Domestic	9,063	9,923	26,870	13,179
Other Gas [Member] | Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Sales Revenue, Services, Other	0	0	0	0
Revenue, Net	138,958	(257,149)	186,319	(262,226)
Income (Loss) from Continuing Operations before Income Taxes, Domestic	201,975	(323,028)	57,089	(381,251)
PA Operations [Member] | Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Sales Revenue, Services, Other	0	0	0	0
Revenue, Net	321,470	262,009	650,200	501,283
Income (Loss) from Continuing Operations before Income Taxes, Domestic	49,643	22,773	110,658	45,847
Depreciation, Depletion and Amortization	41,402	41,698	83,703	82,964
Segment Reporting - Capital Expenditures	$ 13,770	$ 13,099	$ 21,888	$ 26,003

Reconciliation of Segment Inf63

Reconciliation of Segment Information, Total Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016
Assets:
Total Assets	$ 9,025,192	$ 9,183,981	$ 9,784,761
Total Other Assets	383,880	417,403
Items excluded from segment assets:
Recoverable Income Taxes	115,558	$ 116,851
Operating Segments [Member]
Assets:
Total Assets	7,855,607		8,536,991
Corporate and Other [Member]
Assets:
Total Other Assets	761,613		860,866
Other Segments [Member]
Assets:
Total Assets	1,163,299		1,125,351
Items excluded from segment assets:
Cash and Other Investments	292,414
Segment Reconciling Items [Member]
Items excluded from segment assets:
Cash and Other Investments	115,558		88,556
Recoverable Income Taxes			0
Deferred Tax Assets, Net of Valuation Allowance	0		175,929
Disposal Group, Including Discontinued Operation, Assets	$ 0		$ 122,419

Guarantor Subsidiaries Financ64

Guarantor Subsidiaries Financial Information Additional Information (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items]
Cash and Cash Equivalents	$ 299,135	$ 60,475	$ 97,626	$ 72,574
Long-term Debt	2,597,379	2,724,672
Accounts and Notes Receivable:
Trade	215,650	220,222
Inventories	$ 74,965	65,461
Senior Notes 8 Percent Due April 2017 Par Value [Member]
Condensed Financial Statements, Captions [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	8.25%
Senior Notes 8.25 Percent Due April 2020 Par Value Member [Member]
Condensed Financial Statements, Captions [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.375%
Long-term Debt		74,470
Senior Secured Notes Due March 2021 Par Value [Member] [Member] [Member]
Condensed Financial Statements, Captions [Line Items]
Long-term Debt	$ 1,734,987	1,854,731
Senior Secured Notes Due March 2021 Par Value [Member]
Condensed Financial Statements, Captions [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.875%
Long-term Debt		20,611
Senior Notes due April 2023 at 8.0% [Member]
Condensed Financial Statements, Captions [Line Items]
Long-term Debt	$ 494,796	$ 494,344
Senior Notes 8 Percent Due April 2023 Par Value [Member] [Member]
Condensed Financial Statements, Captions [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	8.00%

Guarantor Subsidiaries Income S

Guarantor Subsidiaries Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Schedule of Condensed Consolidating Statement of Operations [Line Items]
Natural Gas, NGLs and Oil Sales	$ 260,305		$ 167,931	$ 578,068	$ 349,188
Unrealized Gain (Loss) on Commodity Derivatives	83,788		(199,380)	61,325	(144,320)
Coal Sales	303,707		250,562	620,155	476,726
Other Revenue, Net	15,974		8,207	29,027	15,973
Purchased Gas Sales	10,316		7,929	19,294	16,547
Freight-Outside	17,763		11,447	30,045	24,557
Other Income (including equity earnings)	33,937		33,636	74,633	81,766
Gain (Loss) on Sale of Assets	140,162		5,614	152,113	(1,662)
Total Revenue and Other Income	865,952		285,946	1,564,660	818,775
Oil and Gas Property, Lease Operating Expense	21,072		23,655	42,705	51,394
Gas Gathering, Transportation, Marketing and Processing Costs	86,599		90,983	180,931	184,957
Production Tax Expense	4,606		6,402	13,935	14,705
E&P Depreciation, Depletion, and Amortization	91,287		105,151	186,635	210,866
Exploration and Production Costs	19,715		2,905	29,501	4,652
Production Royalty Interests and Purchased Gas Costs	10,194		8,884	19,089	16,752
Other Expenses	23,398		21,422	41,328	44,220
Impairment of Oil and Gas Properties	0	$ 137,865	0	137,865	0
Results of Operations, General and Administrative Related to Oil and Gas Producing Activities	20,672		25,411	42,162	47,869
Oil and Gas Production Expense	277,543		284,813	694,151	575,415
Income Tax Expense (Benefit)	66,993		(100,856)	13,204	(124,656)
Income (Loss) from Continuing Operations before Income Taxes, Domestic	240,816		(334,900)	153,525	(401,996)
Costs and Expenses	625,136		620,846	1,411,135	1,220,771
Operating Expenses	201,091		184,459	400,905	338,560
Coal Depreciation, Depletion, Amortization	41,402		41,698	83,703	82,964
Freight Expense	17,763		11,447	30,045	24,557
General and Administrative Expense	17,104		6,779	31,972	12,554
Cost of Coal Products and Services	277,360		244,383	546,625	458,635
Other Nonoperating Expense	38,731		51,776	81,493	86,923
Depreciation, Depletion and Amortization, Nonproduction	(15,620)		(11,629)	(4,499)	(3,622)
Other General and Administrative Expense	3,654		4,075	6,286	6,128
Gain (Loss) on Extinguishment of Debt	36		0	(786)	0
Interest Expense	43,432		47,428	87,865	97,292
Other General Expense	70,233		91,650	170,359	186,721
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	173,823		(234,044)	140,321	(277,340)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	169,510		(235,223)	130,544	(279,633)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	0		(234,605)	0	(287,772)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	173,823		(468,649)	140,321	(565,112)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	4,302		1,179	9,754	2,293
Net Income (Loss) Attributable to Noncontrolling Interest	4,313		1,179	9,777	2,293
Net Income (Loss)	169,510		(469,828)	130,544	(567,405)
Parent Issuer [Member]
Schedule of Condensed Consolidating Statement of Operations [Line Items]
Natural Gas, NGLs and Oil Sales	0		0	0	0
Unrealized Gain (Loss) on Commodity Derivatives	0		0	0	0
Coal Sales	0		0	0	0
Other Revenue, Net	0		0	0	0
Purchased Gas Sales	0		0	0	0
Freight-Outside	0		0	0	0
Other Income (including equity earnings)	201,817		(431,586)	193,331	(498,206)
Gain (Loss) on Sale of Assets	0		0	0	0
Total Revenue and Other Income	201,817		(431,586)	193,331	(498,206)
Oil and Gas Property, Lease Operating Expense	0		0	0	0
Gas Gathering, Transportation, Marketing and Processing Costs	0		0	0	0
Production Tax Expense	0		0	0	0
E&P Depreciation, Depletion, and Amortization	0		0	0	0
Exploration and Production Costs	0		0	0	0
Production Royalty Interests and Purchased Gas Costs	0		0	0	0
Other Expenses	0		0	0	0
Impairment of Oil and Gas Properties				0
Results of Operations, General and Administrative Related to Oil and Gas Producing Activities	0		0	0	0
Oil and Gas Production Expense	0		0	0	0
Income Tax Expense (Benefit)	(19,658)		(23,272)	(38,205)	(42,107)
Income (Loss) from Continuing Operations before Income Taxes, Domestic	149,852		(493,100)	92,339	(609,512)
Costs and Expenses	51,965		61,514	100,992	111,306
Operating Expenses	0		0	0	1,935
Coal Depreciation, Depletion, Amortization	0		0	0	302
Freight Expense	0		0	0	0
General and Administrative Expense	0		0	0	0
Cost of Coal Products and Services	0		0	0	2,237
Other Nonoperating Expense	13,270		18,374	23,548	20,450
Depreciation, Depletion and Amortization, Nonproduction	0		149	0	0
Other General and Administrative Expense	0		0	0	0
Gain (Loss) on Extinguishment of Debt	36			(786)
Interest Expense	38,659		42,991	78,230	88,619
Other General Expense	51,965		61,514	100,992	109,069
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	169,510		(469,828)		(567,405)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent			0		0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	169,510		(469,828)	130,544	(567,405)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	0		0	0	0
Net Income (Loss) Attributable to Noncontrolling Interest	0		0
Net Income (Loss)	169,510		(469,828)	130,544	(567,405)
CNX Gas Guarantor [Member]
Schedule of Condensed Consolidating Statement of Operations [Line Items]
Natural Gas, NGLs and Oil Sales	260,305		167,931	578,068	349,611
Unrealized Gain (Loss) on Commodity Derivatives	83,788		(199,380)	61,325	(144,320)
Coal Sales	0		0	0	0
Other Revenue, Net	0		0	0	0
Purchased Gas Sales	10,316		7,929	19,294	16,547
Freight-Outside	0		0	0	0
Other Income (including equity earnings)	16,768		12,258	32,611	42,419
Gain (Loss) on Sale of Assets	134,377		2,247	137,983	(4,896)
Total Revenue and Other Income	505,554		(9,015)	829,281	259,361
Oil and Gas Property, Lease Operating Expense	21,072		23,655	42,705	51,394
Gas Gathering, Transportation, Marketing and Processing Costs	86,599		90,983	180,931	184,957
Production Tax Expense	4,606		6,402	13,935	14,705
E&P Depreciation, Depletion, and Amortization	91,287		105,151	186,635	210,866
Exploration and Production Costs	19,715		2,905	29,501	4,652
Production Royalty Interests and Purchased Gas Costs	10,194		8,884	19,089	16,752
Other Expenses	23,398		21,422	41,328	44,220
Impairment of Oil and Gas Properties				137,865
Results of Operations, General and Administrative Related to Oil and Gas Producing Activities	20,672		25,411	42,162	47,869
Oil and Gas Production Expense	277,543		284,813	694,151	575,415
Income Tax Expense (Benefit)	90,374		(117,034)	53,216	(126,389)
Income (Loss) from Continuing Operations before Income Taxes, Domestic	227,413		(294,583)	133,911	(317,462)
Costs and Expenses	278,141		285,568	695,370	576,823
Operating Expenses	0		0	0	0
Coal Depreciation, Depletion, Amortization	0		0	0	0
Freight Expense	0		0	0	0
General and Administrative Expense	0		0	0	0
Cost of Coal Products and Services	0		0	0	0
Other Nonoperating Expense	0		0	0	0
Depreciation, Depletion and Amortization, Nonproduction	0		0	0	0
Other General and Administrative Expense	0		0	0	0
Gain (Loss) on Extinguishment of Debt	0			0
Interest Expense	598		755	1,219	1,408
Other General Expense	598		755	1,219	1,408
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	137,039		(177,549)		(191,073)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent			0		0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	137,039		(177,549)	80,695	(191,073)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	0		0	0	0
Net Income (Loss) Attributable to Noncontrolling Interest	0		0
Net Income (Loss)	137,039		(177,549)	80,695	(191,073)
Other Guarantors Subsidiaries [Member]
Schedule of Condensed Consolidating Statement of Operations [Line Items]
Natural Gas, NGLs and Oil Sales	0		0	0	0
Unrealized Gain (Loss) on Commodity Derivatives	0		0	0	0
Coal Sales	227,780		187,922	465,116	357,545
Other Revenue, Net	16,563		8,207	29,616	15,973
Purchased Gas Sales	0		0	0	0
Freight-Outside	13,322		8,650	22,534	18,491
Other Income (including equity earnings)	16,468		19,597	40,220	37,580
Gain (Loss) on Sale of Assets	4,382		3,367	12,730	3,234
Total Revenue and Other Income	278,515		227,743	570,216	432,823
Oil and Gas Property, Lease Operating Expense	0		0	0	0
Gas Gathering, Transportation, Marketing and Processing Costs	0		0	0	0
Production Tax Expense	0		0	0	0
E&P Depreciation, Depletion, and Amortization	0		0	0	0
Exploration and Production Costs	0		0	0	0
Production Royalty Interests and Purchased Gas Costs	0		0	0	0
Other Expenses	0		0	0	0
Impairment of Oil and Gas Properties				0
Results of Operations, General and Administrative Related to Oil and Gas Producing Activities	0		0	0	0
Oil and Gas Production Expense	0		0	0	0
Income Tax Expense (Benefit)	(3,500)		39,453	(1,584)	43,851
Income (Loss) from Continuing Operations before Income Taxes, Domestic	54,483		17,297	95,655	19,503
Costs and Expenses	224,032		210,446	474,561	413,320
Operating Expenses	150,859		138,413	300,790	252,089
Coal Depreciation, Depletion, Amortization	31,125		31,276	62,905	61,923
Freight Expense	13,322		8,650	22,534	18,491
General and Administrative Expense	13,452		4,810	25,037	8,657
Cost of Coal Products and Services	208,758		183,149	411,266	341,160
Other Nonoperating Expense	25,461		33,394	57,945	66,443
Depreciation, Depletion and Amortization, Nonproduction	(15,620)		(11,778)	(4,499)	(3,622)
Other General and Administrative Expense	3,654		4,075	6,286	6,128
Gain (Loss) on Extinguishment of Debt	0			0
Interest Expense	1,779		1,606	3,563	3,211
Other General Expense	15,274		27,297	63,295	72,160
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	57,983		(22,156)		(24,348)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent			0		0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	57,983		(22,156)	97,239	(24,348)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	0		0	0	0
Net Income (Loss) Attributable to Noncontrolling Interest	0		0
Net Income (Loss)	57,983		(22,156)	97,239	(24,348)
CNX Coal Resources LP [Member]
Schedule of Condensed Consolidating Statement of Operations [Line Items]
Natural Gas, NGLs and Oil Sales	0		0	0	0
Unrealized Gain (Loss) on Commodity Derivatives	0		0	0	0
Coal Sales	75,927		62,640	155,039	119,181
Other Revenue, Net	0		0	0	0
Purchased Gas Sales	0		0	0	0
Freight-Outside	4,441		2,797	7,511	6,066
Other Income (including equity earnings)	701		1,780	1,802	1,768
Gain (Loss) on Sale of Assets	1,403		0	1,400	0
Total Revenue and Other Income	82,472		67,217	165,752	127,015
Oil and Gas Property, Lease Operating Expense	0		0	0	0
Gas Gathering, Transportation, Marketing and Processing Costs	0		0	0	0
Production Tax Expense	0		0	0	0
E&P Depreciation, Depletion, and Amortization	0		0	0	0
Exploration and Production Costs	0		0	0	0
Production Royalty Interests and Purchased Gas Costs	0		0	0	0
Other Expenses	0		0	0	0
Impairment of Oil and Gas Properties				0
Results of Operations, General and Administrative Related to Oil and Gas Producing Activities	0		0	0	0
Oil and Gas Production Expense	0		0	0	0
Income Tax Expense (Benefit)	0		0	0	0
Income (Loss) from Continuing Operations before Income Taxes, Domestic	11,474		3,907	25,540	7,723
Costs and Expenses	70,998		63,310	140,212	119,292
Operating Expenses	50,232		46,046	100,115	84,536
Coal Depreciation, Depletion, Amortization	10,277		10,422	20,798	20,739
Freight Expense	4,441		2,797	7,511	6,066
General and Administrative Expense	3,652		1,969	6,935	3,897
Cost of Coal Products and Services	68,602		61,234	135,359	115,238
Other Nonoperating Expense	0		0	0	0
Depreciation, Depletion and Amortization, Nonproduction	0		0	0	0
Other General and Administrative Expense	0		0	0	0
Gain (Loss) on Extinguishment of Debt	0			0
Interest Expense	2,396		2,076	4,853	4,054
Other General Expense	2,396		2,076	4,853	4,054
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	11,474		3,907		7,723
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent			0		0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	11,474		3,907	25,540	7,723
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	0		0	0	0
Net Income (Loss) Attributable to Noncontrolling Interest	0		0
Net Income (Loss)	11,474		3,907	25,540	7,723
Non-Guarantors [Member]
Schedule of Condensed Consolidating Statement of Operations [Line Items]
Natural Gas, NGLs and Oil Sales	0		0	0	0
Unrealized Gain (Loss) on Commodity Derivatives	0		0	0	0
Coal Sales	0		0	0	0
Other Revenue, Net	(589)		0	(589)	0
Purchased Gas Sales	0		0	0	0
Freight-Outside	0		0	0	0
Other Income (including equity earnings)	0		0	0	0
Gain (Loss) on Sale of Assets	0		0	0	0
Total Revenue and Other Income	(589)		0	(589)	0
Oil and Gas Property, Lease Operating Expense	0		0	0	0
Gas Gathering, Transportation, Marketing and Processing Costs	0		0	0	0
Production Tax Expense	0		0	0	0
E&P Depreciation, Depletion, and Amortization	0		0	0	0
Exploration and Production Costs	0		0	0	0
Production Royalty Interests and Purchased Gas Costs	0		0	0	0
Other Expenses	0		0	0	0
Impairment of Oil and Gas Properties				0
Results of Operations, General and Administrative Related to Oil and Gas Producing Activities	0		0	0	0
Oil and Gas Production Expense	0		0	0	0
Income Tax Expense (Benefit)	(223)		(3)	(223)	(11)
Income (Loss) from Continuing Operations before Income Taxes, Domestic	(589)		(8)	(589)	(30)
Costs and Expenses	0		8	0	30
Operating Expenses	0		0	0	0
Coal Depreciation, Depletion, Amortization	0		0	0	0
Freight Expense	0		0	0	0
General and Administrative Expense	0		0	0	0
Cost of Coal Products and Services	0		0	0	0
Other Nonoperating Expense	0		8	0	30
Depreciation, Depletion and Amortization, Nonproduction	0		0	0	0
Other General and Administrative Expense	0		0	0	0
Gain (Loss) on Extinguishment of Debt	0			0
Interest Expense	0		0	0	0
Other General Expense	0		8	0	30
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest			(5)		(19)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	(366)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent			(234,605)		(287,772)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(366)		(234,610)	(366)	(287,791)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	0		0	0	0
Net Income (Loss) Attributable to Noncontrolling Interest	0		0
Net Income (Loss)	(366)		(234,610)	(366)	(287,791)
Consolidation, Eliminations [Member]
Schedule of Condensed Consolidating Statement of Operations [Line Items]
Natural Gas, NGLs and Oil Sales	0		0	0	(423)
Unrealized Gain (Loss) on Commodity Derivatives	0		0	0	0
Coal Sales	0		0	0	0
Other Revenue, Net	0		0	0	0
Purchased Gas Sales	0		0	0	0
Freight-Outside	0		0	0	0
Other Income (including equity earnings)	(201,817)		431,587	(193,331)	498,205
Gain (Loss) on Sale of Assets	0		0	0	0
Total Revenue and Other Income	(201,817)		431,587	(193,331)	497,782
Oil and Gas Property, Lease Operating Expense	0		0	0	0
Gas Gathering, Transportation, Marketing and Processing Costs	0		0	0	0
Production Tax Expense	0		0	0	0
E&P Depreciation, Depletion, and Amortization	0		0	0	0
Exploration and Production Costs	0		0	0	0
Production Royalty Interests and Purchased Gas Costs	0		0	0	0
Other Expenses	0		0	0	0
Impairment of Oil and Gas Properties				0
Results of Operations, General and Administrative Related to Oil and Gas Producing Activities	0		0	0	0
Oil and Gas Production Expense	0		0	0	0
Income Tax Expense (Benefit)	0		0	0	0
Income (Loss) from Continuing Operations before Income Taxes, Domestic	(201,817)		431,587	(193,331)	497,782
Costs and Expenses	0		0	0	0
Operating Expenses	0		0	0	0
Coal Depreciation, Depletion, Amortization	0		0	0	0
Freight Expense	0		0	0	0
General and Administrative Expense	0		0	0	0
Cost of Coal Products and Services	0		0	0	0
Other Nonoperating Expense	0		0	0	0
Depreciation, Depletion and Amortization, Nonproduction	0		0	0	0
Other General and Administrative Expense	0		0	0	0
Gain (Loss) on Extinguishment of Debt	0			0
Interest Expense	0		0	0	0
Other General Expense	0		0	0	0
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	(201,817)		431,587		497,782
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent			0		0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(201,817)		431,587	(193,331)	497,782
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest				9,754	2,293
Net Income (Loss) Attributable to Noncontrolling Interest	4,313		1,179	9,777	2,293
Net Income (Loss)	$ (206,130)		$ 430,408	$ (203,108)	$ 495,489

Guarantor Subsidiaries Balance

Guarantor Subsidiaries Balance Sheet (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Current Assets:
Cash and Cash Equivalents	$ 299,135	$ 60,475	$ 97,626	$ 72,574
Accounts and Notes Receivable:
Other Receivables, Net, Current	77,609	69,901
Trade	215,650	220,222
Inventories	74,965	65,461
Recoverable Income Taxes	115,558	116,851
Prepaid Expenses	64,177	93,146
Disposal Group, Including Discontinued Operation, Assets, Current	0	83
Total Current Assets	847,094	626,139
Property, Plant and Equipment:
Property, Plant and Equipment	13,619,819	13,771,388
Less-Accumulated Depreciation, Depletion and Amortization	5,825,601	5,630,949
Total Property, Plant and Equipment-Net	7,794,218	8,140,439
Other Assets:
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	188,649	190,964
Other	195,231	222,149
Deferred Income Taxes	0	4,290
Total Other Assets	383,880	417,403
Total Assets	9,025,192	9,183,981	$ 9,784,761
Current Liabilities:
Accounts Payable	265,125	241,616
Accounts Payable (Recoverable)- Related Parties	0	0
Current Portion of Long-Term Debt	11,385	12,000
Other Accrued Liabilities	543,511	680,348
Disposal Group, Including Discontinued Operation, Liabilities, Current	5,692	6,050
Total Current Liabilities	825,713	940,014
Long-Term Debt:	2,630,108	2,762,069
Deferred Credits and Other Liabilities
Deferred Tax Liabilities, Net, Noncurrent	17,084	0
Postretirement Benefits Other Than Pensions	652,206	659,474
Pneumoconiosis	107,321	108,073
Mine Closing	200,132	218,631
Gas Well Closing	224,327	223,352
Workers' Compensation	66,009	67,277
Salary Retirement	104,463	112,543
Other Liabilities, Noncurrent	110,282	151,660
Total Deferred Credits and Other Liabilities	1,481,824	1,541,010
Total CONSOL Energy Inc. Stockholders' Equity	3,945,337	3,798,395
Stockholders' Equity Attributable to Noncontrolling Interest	142,210	142,493
TOTAL LIABILITIES AND EQUITY	9,025,192	9,183,981
Accrued Income Taxes, Current	0
Consolidation, Eliminations [Member]
Current Assets:
Cash and Cash Equivalents	0	0
Accounts and Notes Receivable:
Other Receivables, Net, Current	0	0
Trade	0	0
Inventories	0	0
Recoverable Income Taxes	0	0
Prepaid Expenses	0	0
Disposal Group, Including Discontinued Operation, Assets, Current		0
Total Current Assets	0	0
Property, Plant and Equipment:
Property, Plant and Equipment	0	0
Less-Accumulated Depreciation, Depletion and Amortization	0	0
Total Property, Plant and Equipment-Net	0	0
Other Assets:
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	(7,564,234)	(7,998,941)
Other	0	0
Deferred Income Taxes		0
Total Other Assets	(7,564,234)	(7,998,941)
Total Assets	(7,564,234)	(7,998,941)
Current Liabilities:
Accounts Payable	10,448	10,805
Accounts Payable (Recoverable)- Related Parties	(10,448)	(10,805)
Current Portion of Long-Term Debt	0	0
Other Accrued Liabilities	0	0
Disposal Group, Including Discontinued Operation, Liabilities, Current	1	0
Total Current Liabilities	1	0
Long-Term Debt:	0	0
Deferred Credits and Other Liabilities
Deferred Tax Liabilities, Net, Noncurrent	0
Postretirement Benefits Other Than Pensions	0	0
Pneumoconiosis	0	0
Mine Closing	0	0
Gas Well Closing	0	0
Workers' Compensation	0	0
Salary Retirement	0	0
Other Liabilities, Noncurrent	0	0
Total Deferred Credits and Other Liabilities	0	0
Total CONSOL Energy Inc. Stockholders' Equity	(7,706,445)	(8,141,434)
Stockholders' Equity Attributable to Noncontrolling Interest	142,210	142,493
TOTAL LIABILITIES AND EQUITY	(7,564,234)	(7,998,941)
Accrued Income Taxes, Current	0
Non-Guarantors [Member]
Current Assets:
Cash and Cash Equivalents	861	885
Accounts and Notes Receivable:
Other Receivables, Net, Current	0	0
Trade	0	0
Inventories	0	0
Recoverable Income Taxes	0	0
Prepaid Expenses	0	0
Disposal Group, Including Discontinued Operation, Assets, Current		83
Total Current Assets	861	968
Property, Plant and Equipment:
Property, Plant and Equipment	0	0
Less-Accumulated Depreciation, Depletion and Amortization	0	0
Total Property, Plant and Equipment-Net	0	0
Other Assets:
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	0	0
Other	0	0
Deferred Income Taxes		0
Total Other Assets	0	0
Total Assets	861	968
Current Liabilities:
Accounts Payable	0	0
Accounts Payable (Recoverable)- Related Parties	(31,044)	(209,491)
Current Portion of Long-Term Debt	0	0
Other Accrued Liabilities	(1)	0
Disposal Group, Including Discontinued Operation, Liabilities, Current	1	6,050
Total Current Liabilities	(31,044)	(203,441)
Long-Term Debt:	0	0
Deferred Credits and Other Liabilities
Deferred Tax Liabilities, Net, Noncurrent	0
Postretirement Benefits Other Than Pensions	0	0
Pneumoconiosis	0	0
Mine Closing	0	0
Gas Well Closing	0	0
Workers' Compensation	0	0
Salary Retirement	0	0
Other Liabilities, Noncurrent	1	0
Total Deferred Credits and Other Liabilities	1	0
Total CONSOL Energy Inc. Stockholders' Equity	31,904	204,409
Stockholders' Equity Attributable to Noncontrolling Interest	0	0
TOTAL LIABILITIES AND EQUITY	861	968
Accrued Income Taxes, Current	0
Parent Issuer [Member]
Current Assets:
Cash and Cash Equivalents	291,566	49,722
Accounts and Notes Receivable:
Other Receivables, Net, Current	22,824	20,097
Trade	0	0
Inventories	0	0
Recoverable Income Taxes	175,775	175,877
Prepaid Expenses	9,869	12,828
Disposal Group, Including Discontinued Operation, Assets, Current		0
Total Current Assets	500,034	258,524
Property, Plant and Equipment:
Property, Plant and Equipment	113,126	114,611
Less-Accumulated Depreciation, Depletion and Amortization	86,148	84,788
Total Property, Plant and Equipment-Net	26,978	29,823
Other Assets:
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	7,522,579	7,974,260
Other	7,310	19,960
Deferred Income Taxes		25,904
Total Other Assets	7,529,889	8,020,124
Total Assets	8,056,901	8,308,471
Current Liabilities:
Accounts Payable	19,001	48,666
Accounts Payable (Recoverable)- Related Parties	1,655,538	1,832,908
Current Portion of Long-Term Debt	1,131	1,533
Other Accrued Liabilities	68,024	75,039
Disposal Group, Including Discontinued Operation, Liabilities, Current	0	0
Total Current Liabilities	1,743,694	1,958,146
Long-Term Debt:	2,304,912	2,421,511
Deferred Credits and Other Liabilities
Deferred Tax Liabilities, Net, Noncurrent	(57,746)
Postretirement Benefits Other Than Pensions	0	0
Pneumoconiosis	0	0
Mine Closing	0	0
Gas Well Closing	0	0
Workers' Compensation	0	0
Salary Retirement	104,463	112,543
Other Liabilities, Noncurrent	16,241	17,876
Total Deferred Credits and Other Liabilities	62,958	130,419
Total CONSOL Energy Inc. Stockholders' Equity	3,945,337	3,798,395
Stockholders' Equity Attributable to Noncontrolling Interest	0	0
TOTAL LIABILITIES AND EQUITY	8,056,901	8,308,471
Accrued Income Taxes, Current	0
CNX Gas Guarantor [Member]
Current Assets:
Cash and Cash Equivalents	100	83
Accounts and Notes Receivable:
Other Receivables, Net, Current	40,224	34,773
Trade	108,622	124,509
Inventories	14,679	15,301
Recoverable Income Taxes	39,477	(59,026)
Prepaid Expenses	2,923	60,500
Disposal Group, Including Discontinued Operation, Assets, Current		0
Total Current Assets	206,025	176,140
Property, Plant and Equipment:
Property, Plant and Equipment	8,683,919	8,851,226
Less-Accumulated Depreciation, Depletion and Amortization	3,216,357	3,106,296
Total Property, Plant and Equipment-Net	5,467,562	5,744,930
Other Assets:
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	185,871	188,376
Other	64,647	67,096
Deferred Income Taxes		(21,614)
Total Other Assets	250,518	233,858
Total Assets	5,924,105	6,154,928
Current Liabilities:
Accounts Payable	166,915	127,309
Accounts Payable (Recoverable)- Related Parties	714,950	1,034,138
Current Portion of Long-Term Debt	6,590	6,369
Other Accrued Liabilities	201,202	337,374
Disposal Group, Including Discontinued Operation, Liabilities, Current	0	0
Total Current Liabilities	1,149,874	1,505,190
Long-Term Debt:	23,635	26,884
Deferred Credits and Other Liabilities
Deferred Tax Liabilities, Net, Noncurrent	0
Postretirement Benefits Other Than Pensions	0	0
Pneumoconiosis	0	0
Mine Closing	0	0
Gas Well Closing	195,743	195,704
Workers' Compensation	0	0
Salary Retirement	0	0
Other Liabilities, Noncurrent	156,207	117,658
Total Deferred Credits and Other Liabilities	351,950	313,362
Total CONSOL Energy Inc. Stockholders' Equity	4,398,646	4,309,492
Stockholders' Equity Attributable to Noncontrolling Interest	0	0
TOTAL LIABILITIES AND EQUITY	5,924,105	6,154,928
Accrued Income Taxes, Current	60,217
Other Guarantors Subsidiaries [Member]
Current Assets:
Cash and Cash Equivalents	0	0
Accounts and Notes Receivable:
Other Receivables, Net, Current	13,409	14,516
Trade	81,003	72,295
Inventories	46,279	38,669
Recoverable Income Taxes	(99,694)	0
Prepaid Expenses	48,705	16,306
Disposal Group, Including Discontinued Operation, Assets, Current		0
Total Current Assets	89,702	141,786
Property, Plant and Equipment:
Property, Plant and Equipment	3,939,431	3,928,861
Less-Accumulated Depreciation, Depletion and Amortization	2,060,509	1,997,687
Total Property, Plant and Equipment-Net	1,878,922	1,931,174
Other Assets:
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	44,433	27,269
Other	104,167	114,030
Deferred Income Taxes		0
Total Other Assets	148,600	141,299
Total Assets	2,117,224	2,214,259
Current Liabilities:
Accounts Payable	52,758	36,039
Accounts Receivable, Related Parties	(2,331,192)	(2,648,416)
Current Portion of Long-Term Debt	3,575	4,010
Other Accrued Liabilities	229,972	223,705
Disposal Group, Including Discontinued Operation, Liabilities, Current	5,690	0
Total Current Liabilities	(2,099,414)	(2,384,662)
Long-Term Debt:	114,160	115,685
Deferred Credits and Other Liabilities
Deferred Tax Liabilities, Net, Noncurrent	74,830
Postretirement Benefits Other Than Pensions	652,206	659,474
Pneumoconiosis	104,708	106,016
Mine Closing	190,914	209,384
Gas Well Closing	28,482	27,549
Workers' Compensation	62,878	64,187
Salary Retirement	0	0
Other Liabilities, Noncurrent	(62,604)	15,663
Total Deferred Credits and Other Liabilities	1,051,414	1,082,273
Total CONSOL Energy Inc. Stockholders' Equity	3,051,064	3,400,963
Stockholders' Equity Attributable to Noncontrolling Interest	0	0
TOTAL LIABILITIES AND EQUITY	2,117,224	2,214,259
Accrued Income Taxes, Current	(60,217)
CNX Coal Resources LP [Member]
Current Assets:
Cash and Cash Equivalents	6,608	9,785
Accounts and Notes Receivable:
Other Receivables, Net, Current	1,152	515
Trade	26,025	23,418
Inventories	14,007	11,491
Recoverable Income Taxes	0	0
Prepaid Expenses	2,680	3,512
Disposal Group, Including Discontinued Operation, Assets, Current		0
Total Current Assets	50,472	48,721
Property, Plant and Equipment:
Property, Plant and Equipment	883,343	876,690
Less-Accumulated Depreciation, Depletion and Amortization	462,587	442,178
Total Property, Plant and Equipment-Net	420,756	434,512
Other Assets:
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	0	0
Other	19,107	21,063
Deferred Income Taxes		0
Total Other Assets	19,107	21,063
Total Assets	490,335	504,296
Current Liabilities:
Accounts Payable	16,003	18,797
Accounts Payable (Recoverable)- Related Parties	2,196	1,666
Current Portion of Long-Term Debt	89	88
Other Accrued Liabilities	44,314	44,230
Disposal Group, Including Discontinued Operation, Liabilities, Current	0	0
Total Current Liabilities	62,602	64,781
Long-Term Debt:	187,401	197,989
Deferred Credits and Other Liabilities
Deferred Tax Liabilities, Net, Noncurrent	0
Postretirement Benefits Other Than Pensions	0	0
Pneumoconiosis	2,613	2,057
Mine Closing	9,218	9,247
Gas Well Closing	102	99
Workers' Compensation	3,131	3,090
Salary Retirement	0	0
Other Liabilities, Noncurrent	437	463
Total Deferred Credits and Other Liabilities	15,501	14,956
Total CONSOL Energy Inc. Stockholders' Equity	224,831	226,570
Stockholders' Equity Attributable to Noncontrolling Interest	0	0
TOTAL LIABILITIES AND EQUITY	490,335	$ 504,296
Accrued Income Taxes, Current	$ 0

Guarantor Subsidiaries, Condens

Guarantor Subsidiaries, Condensed Statement of Cash Flows (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	$ 294,171	$ 206,345
Cash Provided by (Used in) Operating Activities, Discontinued Operations	(275)	19,053
Net Cash Provided by Operating Activities	293,896	225,398
Investing Activities:
Capital Expenditures	(273,326)	(115,257)
Proceeds from Sale of Productive Assets	345,151	18,284
Payments for (Proceeds from) Businesses and Interest in Affiliates	24,700	(5,578)
Net Cash Provided by (Used in) Investing Activities, Continuing Operations	96,525	(102,551)
Cash Provided by (Used in) Investing Activities, Discontinued Operations	0	394,511
Net Cash Provided by (Used in) Investing Activities	96,525	291,960
Financing Activities:
(Payments on) Proceeds from Short-Term Borrowings	0	(486,000)
Repayments of Other Debt	(5,973)	(4,459)
Payments of Dividends	0	(2,294)
Net Proceeds from Revolver - MLP	(11,000)	13,000
Noncontrolling Interest, Period Increase (Decrease)	(10,935)	(10,825)
Payments On Long Term Notes Including Redemption Premium	(117,185)	0
Proceeds from Issuance of Common Stock	723	4
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	(7,093)	(1,657)
Payments of Debt Issuance Costs	(298)
Net Cash Provided by (Used in) Financing Activities, Continuing Operations	(151,761)	(492,231)
Cash Provided by (Used in) Financing Activities, Discontinued Operations	0	(75)
Net Cash Provided by (Used in) Financing Activities	(151,761)	(492,306)
Payments for Advance to Affiliate	0
Parent Issuer [Member]
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	367,073	513,672
Cash Provided by (Used in) Operating Activities, Discontinued Operations	0	0
Net Cash Provided by Operating Activities	367,073	513,672
Investing Activities:
Capital Expenditures	(1,355)	(1,899)
Proceeds from Sale of Productive Assets	0	0
Payments for (Proceeds from) Businesses and Interest in Affiliates	0	0
Net Cash Provided by (Used in) Investing Activities, Continuing Operations		(1,899)
Cash Provided by (Used in) Investing Activities, Discontinued Operations		0
Net Cash Provided by (Used in) Investing Activities	(1,355)	(1,899)
Financing Activities:
(Payments on) Proceeds from Short-Term Borrowings		(486,000)
Repayments of Other Debt	(828)	(803)
Payments of Dividends		(2,294)
Net Proceeds from Revolver - MLP	0	0
Noncontrolling Interest, Period Increase (Decrease)	0	0
Payments On Long Term Notes Including Redemption Premium	(117,185)
Proceeds from Issuance of Common Stock	723	4
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	(6,286)	(1,657)
Payments of Debt Issuance Costs	(298)
Net Cash Provided by (Used in) Financing Activities, Continuing Operations		(490,750)
Cash Provided by (Used in) Financing Activities, Discontinued Operations		0
Net Cash Provided by (Used in) Financing Activities	(123,874)	(490,750)
Payments for Advance to Affiliate	0
CNX Gas Guarantor [Member]
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	(104,963)	81,153
Cash Provided by (Used in) Operating Activities, Discontinued Operations	0	0
Net Cash Provided by Operating Activities	(104,963)	81,153
Investing Activities:
Capital Expenditures	(243,097)	(86,222)
Proceeds from Sale of Productive Assets	326,521	13,700
Payments for (Proceeds from) Businesses and Interest in Affiliates	24,700	(5,578)
Net Cash Provided by (Used in) Investing Activities, Continuing Operations		(78,100)
Cash Provided by (Used in) Investing Activities, Discontinued Operations		0
Net Cash Provided by (Used in) Investing Activities	108,124	(78,100)
Financing Activities:
(Payments on) Proceeds from Short-Term Borrowings		0
Repayments of Other Debt	(3,144)	(3,053)
Payments of Dividends		0
Net Proceeds from Revolver - MLP	0	0
Noncontrolling Interest, Period Increase (Decrease)	0	0
Payments On Long Term Notes Including Redemption Premium	0
Proceeds from Issuance of Common Stock	0	0
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	0	0
Payments of Debt Issuance Costs	0
Net Cash Provided by (Used in) Financing Activities, Continuing Operations		(3,053)
Cash Provided by (Used in) Financing Activities, Discontinued Operations		0
Net Cash Provided by (Used in) Financing Activities	(3,144)	(3,053)
Payments for Advance to Affiliate	0
Other Guarantors Subsidiaries [Member]
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	8,221	12,179
Cash Provided by (Used in) Operating Activities, Discontinued Operations	0	0
Net Cash Provided by Operating Activities	8,221	12,179
Investing Activities:
Capital Expenditures	(24,902)	(20,635)
Proceeds from Sale of Productive Assets	18,630	4,565
Payments for (Proceeds from) Businesses and Interest in Affiliates	0	0
Net Cash Provided by (Used in) Investing Activities, Continuing Operations		(16,070)
Cash Provided by (Used in) Investing Activities, Discontinued Operations		0
Net Cash Provided by (Used in) Investing Activities	(6,272)	(16,070)
Financing Activities:
(Payments on) Proceeds from Short-Term Borrowings		0
Repayments of Other Debt	(1,949)	(568)
Payments of Dividends		0
Net Proceeds from Revolver - MLP	0	0
Noncontrolling Interest, Period Increase (Decrease)	0	0
Payments On Long Term Notes Including Redemption Premium	0
Proceeds from Issuance of Common Stock	0	0
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	0	0
Payments of Debt Issuance Costs	0
Net Cash Provided by (Used in) Financing Activities, Continuing Operations		(568)
Cash Provided by (Used in) Financing Activities, Discontinued Operations		0
Net Cash Provided by (Used in) Financing Activities	(1,949)	(568)
Payments for Advance to Affiliate
CNX Coal Resources LP [Member]
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	40,754	24,831
Cash Provided by (Used in) Operating Activities, Discontinued Operations	0	0
Net Cash Provided by Operating Activities	40,754	24,831
Investing Activities:
Capital Expenditures	(3,972)	(6,501)
Proceeds from Sale of Productive Assets	0	19
Payments for (Proceeds from) Businesses and Interest in Affiliates	0	0
Net Cash Provided by (Used in) Investing Activities, Continuing Operations		(6,482)
Cash Provided by (Used in) Investing Activities, Discontinued Operations		0
Net Cash Provided by (Used in) Investing Activities	(3,972)	(6,482)
Financing Activities:
(Payments on) Proceeds from Short-Term Borrowings		0
Repayments of Other Debt	(52)	(35)
Payments of Dividends		0
Net Proceeds from Revolver - MLP	(11,000)	13,000
Noncontrolling Interest, Period Increase (Decrease)	(28,100)	(24,288)
Payments On Long Term Notes Including Redemption Premium	0
Proceeds from Issuance of Common Stock	0	0
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	(807)	0
Payments of Debt Issuance Costs	0
Net Cash Provided by (Used in) Financing Activities, Continuing Operations		(15,920)
Cash Provided by (Used in) Financing Activities, Discontinued Operations		0
Net Cash Provided by (Used in) Financing Activities	(39,959)	(15,920)
Payments of Distributions to Affiliates	(4,597)
Non-Guarantors [Member]
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	251	(412,027)
Cash Provided by (Used in) Operating Activities, Discontinued Operations	(275)	19,053
Net Cash Provided by Operating Activities	(24)	(392,974)
Investing Activities:
Capital Expenditures	0	0
Proceeds from Sale of Productive Assets	0	0
Payments for (Proceeds from) Businesses and Interest in Affiliates	0	0
Net Cash Provided by (Used in) Investing Activities, Continuing Operations		0
Cash Provided by (Used in) Investing Activities, Discontinued Operations		394,511
Net Cash Provided by (Used in) Investing Activities	0	394,511
Financing Activities:
(Payments on) Proceeds from Short-Term Borrowings		0
Repayments of Other Debt	0	0
Payments of Dividends		0
Net Proceeds from Revolver - MLP	0	0
Noncontrolling Interest, Period Increase (Decrease)	0	0
Payments On Long Term Notes Including Redemption Premium	0
Proceeds from Issuance of Common Stock	0	0
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	0	0
Payments of Debt Issuance Costs	0
Net Cash Provided by (Used in) Financing Activities, Continuing Operations		0
Cash Provided by (Used in) Financing Activities, Discontinued Operations		(75)
Net Cash Provided by (Used in) Financing Activities	0	(75)
Payments for Advance to Affiliate	0
Consolidation, Eliminations [Member]
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	(17,165)	(13,463)
Cash Provided by (Used in) Operating Activities, Discontinued Operations	0	0
Net Cash Provided by Operating Activities	(17,165)	(13,463)
Investing Activities:
Capital Expenditures	0	0
Proceeds from Sale of Productive Assets	0	0
Payments for (Proceeds from) Businesses and Interest in Affiliates	0	0
Net Cash Provided by (Used in) Investing Activities, Continuing Operations		0
Cash Provided by (Used in) Investing Activities, Discontinued Operations		0
Net Cash Provided by (Used in) Investing Activities	0	0
Financing Activities:
(Payments on) Proceeds from Short-Term Borrowings		0
Repayments of Other Debt	0	0
Payments of Dividends		0
Net Proceeds from Revolver - MLP	0	0
Noncontrolling Interest, Period Increase (Decrease)	17,165	13,463
Payments On Long Term Notes Including Redemption Premium	0
Proceeds from Issuance of Common Stock	0	0
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	0	0
Payments of Debt Issuance Costs	0
Net Cash Provided by (Used in) Financing Activities, Continuing Operations		18,060
Cash Provided by (Used in) Financing Activities, Discontinued Operations		0
Net Cash Provided by (Used in) Financing Activities	17,165	$ 18,060
Payments of Distributions to Affiliates	$ 4,597

Guarantor Subsidiaries Financ68

Guarantor Subsidiaries Financial Information Gurantor Subsidiaries Statement of Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Net Income (Loss) Attributable to Parent [Abstract]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 173,823	$ (468,649)	$ 140,321	$ (565,112)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent [Abstract]
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	3,464	8,045	6,966	5,561
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	0	(11,203)	0	(21,017)
Other Comprehensive Income (Loss), Net of Tax	3,464	(3,158)	6,966	(15,456)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	177,287	(471,807)	147,287	(580,568)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	4,302	1,179	9,754	2,293
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	172,985	(472,986)	137,533	(582,861)
Parent Issuer [Member]
Net Income (Loss) Attributable to Parent [Abstract]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	169,510	(469,828)	130,544	(567,405)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent [Abstract]
Other Comprehensive Income (Loss), Net of Tax	3,464	(3,158)	6,966	(15,456)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	172,974	(472,986)	137,510	(582,861)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	0	0	0	0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	172,974	(472,986)	137,510	(582,861)
CNX Gas Guarantor [Member]
Net Income (Loss) Attributable to Parent [Abstract]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	137,039	(177,549)	80,695	(191,073)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent [Abstract]
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	0	0	0	0
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		(11,203)		(21,017)
Other Comprehensive Income (Loss), Net of Tax	0	(11,203)	0	(21,017)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	137,039	(188,752)	80,695	(212,090)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	0	0	0	0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	137,039	(188,752)	80,695	(212,090)
Other Guarantors Subsidiaries [Member]
Net Income (Loss) Attributable to Parent [Abstract]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	57,983	(22,156)	97,239	(24,348)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent [Abstract]
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	3,504	8,067	7,045	5,608
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		0		0
Other Comprehensive Income (Loss), Net of Tax	3,504	8,067	7,045	5,608
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	61,487	(14,089)	104,284	(18,740)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	0	0	0	0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	61,487	(14,089)	104,284	(18,740)
CNX Coal Resources LP [Member]
Net Income (Loss) Attributable to Parent [Abstract]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	11,474	3,907	25,540	7,723
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent [Abstract]
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	(40)	(22)	(79)	(47)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		0		0
Other Comprehensive Income (Loss), Net of Tax	(40)	(22)	(79)	(47)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	11,434	3,885	25,461	7,676
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	0	0	0	0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	11,434	3,885	25,461	7,676
Non-Guarantors [Member]
Net Income (Loss) Attributable to Parent [Abstract]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(366)	(234,610)	(366)	(287,791)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent [Abstract]
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	0	0	0	0
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		0		0
Other Comprehensive Income (Loss), Net of Tax	0	0	0	0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	(366)	(234,610)	(366)	(287,791)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	0	0	0	0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	(366)	(234,610)	(366)	(287,791)
Consolidation, Eliminations [Member]
Net Income (Loss) Attributable to Parent [Abstract]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(201,817)	431,587	(193,331)	497,782
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent [Abstract]
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	(3,464)	(8,045)	(6,966)	(5,561)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		11,203		21,017
Other Comprehensive Income (Loss), Net of Tax	(3,464)	3,158	(6,966)	15,456
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	(205,281)	434,745	(200,297)	513,238
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest			9,754	2,293
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ (209,583)	$ 433,566	$ (210,051)	$ 510,945

Related Party Transaction (Deta

Related Party Transaction (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			6 Months Ended		9 Months Ended	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Sep. 30, 2015	Jun. 30, 2017	Jun. 30, 2016	Sep. 30, 2014	Dec. 31, 2016
Related Party Transaction [Line Items]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	$ 188,649			$ 188,649			$ 190,964
Income (Loss) from Equity Method Investments				(22,385)	$ (25,884)
Partners' Capital Account, Units, Sold in Public Offering			5,000,000
Initial Public Offering Share Price			$ 15
Initial Public Offering overallotment			561,067
Debt Instrument, Face Amount	400,000			400,000
Long-term Debt	2,597,379			2,597,379			2,724,672
Financing Related Fees				3,000
Long-term debt, net of fees	197,000			197,000
Net Proceeds from Initial Public Offering				342,711
Cash paid for additional interest	$ 21,500			$ 21,500
Preferred Units, Issued	3,956,496			3,956,496
Preferred Stock, Par or Stated Value Per Share	$ 17.01			$ 17.01
Other Significant Noncash Transaction, Value of Consideration Given				$ 67,300
volume weighted average trading price	$ 14.79			$ 14.79
Accounts Payable, Related Parties	$ 2,196,000			$ 2,196,000			1,666,000
Co-venturer [Member]
Related Party Transaction [Line Items]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	140,553			140,553			151,075
Distribution Made to Limited Partner, Cash Distributions Paid				(12,672)
Income (Loss) from Equity Method Investments	284	$ 753		2,150	7,146
Related Party Transaction, Expenses from Transactions with Related Party	232	152		485	369
Due from Related Parties	7,885			7,885			5,815
Equity Method Investment Summarized Financial Information, Equity	2,150			2,150
General Partner [Member]
Related Party Transaction [Line Items]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	25,889			25,889			18,133
Sale of Stock, Description of Transaction						20,125,000
Excess Stock, Shares Authorized						2,625,000
Distribution Made to Limited Partner, Cash Distributions Paid				(12,028)
Income (Loss) from Equity Method Investments	9,712	7,452		19,784	15,410
Related Party Transaction, Expenses from Transactions with Related Party	31,695	29,565		65,749	61,210
Total Purchase Consideration of Drop							248,000
Equity Method Investment, Cash Consideration for Drop							$ 140,000
Equity Method Investment, Stock Issued on Drop							5,200,000
Equity Method Investment Summarized Financial Information, Equity	19,784			19,784
Limited Partner [Member]
Related Party Transaction [Line Items]
Proceeds from Issuance Initial Public Offering			$ 75,000
Long-term Debt	200,000			200,000
Equity Method Investee [Member]
Related Party Transaction [Line Items]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	166,442			166,442			$ 169,208
Distribution Made to Limited Partner, Cash Distributions Paid				(24,700)
Equity Method Investment Summarized Financial Information, Equity	21,934			21,934
Operating and Other Costs [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	867	1,270		1,739	2,536
Selling and Direct Administrative Expenses [Member] [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	$ 737	$ 1,190		$ 1,454	$ 2,305

Subsequent Event (Details)

Subsequent Event (Details) - USD ($)	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Subsequent Event [Line Items]
Long-term Debt		$ 2,597,379,000	$ 2,724,672,000
Senior Notes 8 Percent Due April 2017 Par Value [Member]
Subsequent Event [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		8.25%
Senior Notes 8.25 Percent Due April 2020 Par Value Member [Member]
Subsequent Event [Line Items]
Long-term Debt			74,470,000
Debt Instrument, Interest Rate, Stated Percentage		6.375%
Senior Secured Notes Due March 2021 Par Value [Member]
Subsequent Event [Line Items]
Long-term Debt			$ 20,611,000
Debt Instrument, Interest Rate, Stated Percentage		5.875%
Subsequent Event [Member]
Subsequent Event [Line Items]
Debt Instrument, Face Amount	$ 101.375
Subsequent Event [Member] | Senior Notes 8 Percent Due April 2017 Par Value [Member]
Subsequent Event [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	8.25%
Subsequent Event [Member] | Senior Notes 8.25 Percent Due April 2020 Par Value Member [Member]
Subsequent Event [Line Items]
Long-term Debt	$ 74,470,000
Debt Instrument, Interest Rate, Stated Percentage	6.375%
Subsequent Event [Member] | Senior Secured Notes Due March 2021 Par Value [Member]
Subsequent Event [Line Items]
Long-term Debt	$ 20,611,000