Supplemental Information Relating To Oil And Natural Gas Producing Activities (unaudited) (Reserve Quantities) (Details) bbl in Thousands, Mcf in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2015 USD ($) Mcfe bbl Mcf		Dec. 31, 2014 USD ($) Mcfe bbl Mcf		Dec. 31, 2013 USD ($) Mcfe bbl Mcf
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward]
Standardized measure of discounted future net cash flows | $		$ 402,133		$ 1,542,587		$ 1,252,273
Oil [Member]
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward]
Beginning balance | bbl		17,687		15,378		5,570
Purchase of reserves in place | bbl		459	[1]	0	[2]	16,022	[3]
Discoveries and extensions | bbl		7,602	[4]	4,164	[5]	5,960	[6]
Changes in price | bbl		(2,821)		45		457
Revisions to Proved Developed and Undeveloped Reserves | bbl		(145)	[7]	1,737	[8]	(3,219)	[9]
Sales of reserves in place | bbl		(1)		(1,401)	[10]	(8,224)	[11]
Production | bbl		(2,342)		(2,236)		(1,188)
Ending balance | bbl		20,439		17,687		15,378
Proved developed | bbl		12,056		14,429		11,274
Proved undeveloped | bbl		8,383		3,258		4,104
Natural Gas [Member]
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward]
Beginning balance | Mcf	[12]	1,157,674		1,031,977		975,966
Purchase of reserves in place | Mcf	[12]	122	[1]	7,316	[2]	304,139	[3]
Discoveries and extensions | Mcf	[12]	152,473	[4]	70,544	[5]	49,912	[6]
Changes in price | Mcf	[12]	(598,865)		168,064		276,730
Revisions to Proved Developed and Undeveloped Reserves | Mcf	[12]	184,641	[7]	120,802	[8]	(111,141)	[9]
Sales of reserves in place | Mcf	[12]	(1,445)		(118,705)	[10]	(308,850)	[11]
Production | Mcf	[12]	(109,926)		(122,324)		(154,779)
Ending balance | Mcf	[12]	784,674		1,157,674		1,031,977
Proved developed | Mcf		364,932		504,636		669,644
Proved undeveloped | Mcf		419,742		653,038		362,333
Mcfe [Member]
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward]
Proved Developed and Undeveloped Reserves, Net (Mcfe)	[13]	1,263,796,000		1,124,245,000		1,009,386,000
Proved Developed and Undeveloped Reserves, Purchases of Minerals in Place (Mcfe)	[13]	2,876,000	[1]	7,316,000	[2]	400,271,000	[3]
Proved Developed and Undeveloped Reserves, Extensions, Discoveries, and Additions (Mcfe)	[13]	198,085,000	[4]	95,528,000	[5]	85,672,000	[6]
Revisions To Proved Developed And Undeveloped Reserves Due To Changes In Price (Mcfe)	[13]	(615,791,000)		168,334,000		279,472,000
Revisions to Proved Developed and Undeveloped Reserves due to other Factors (Mcfe)	[13]	183,771,000	[7]	131,224,000	[8]	(130,455,000)	[9]
Proved Developed and Undeveloped Reserves, Sales of Minerals in Place (Mcfe)	[13]	(1,451,000)		(127,111,000)	[10]	(358,194,000)	[11]
Proved Developed and Undeveloped Reserves, Production (Mcfe)	[13]	(123,978,000)		(135,740,000)		(161,907,000)
Proved Developed and Undeveloped Reserves, Net (Mcfe)	[13]	907,308,000		1,263,796,000		1,124,245,000
Proved developed		437,268,000		591,210,000		737,291,000
Proved Undeveloped Reserves (Energy)		470,040,000		672,586,000		386,954,000
Holly area [Member]
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward]
Proved Developed and Undeveloped Reserves, Extensions, Discoveries, and Additions (Mcfe)		24,700,000
Revisions to Proved Developed and Undeveloped Reserves due to other Factors (Mcfe)		152,200,000		5,800,000
Appalachia [Member]
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward]
Revisions to Proved Developed and Undeveloped Reserves due to other Factors (Mcfe)				45,900,000
Marcellus Shale [Member]
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward]
Proved Developed and Undeveloped Reserves, Extensions, Discoveries, and Additions (Mcfe)						33,600,000
Permian [Member]
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward]
Proved Developed and Undeveloped Reserves, Purchases of Minerals in Place (Mcfe)						1,500,000
Eagle Ford [Member]
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward]
Proved Developed and Undeveloped Reserves, Purchases of Minerals in Place (Mcfe)						115,700,000
Proved Developed and Undeveloped Reserves, Extensions, Discoveries, and Additions (Mcfe)		47,500,000		26,100,000		36,500,000
Proved Developed and Undeveloped Reserves, Sales of Minerals in Place (Mcfe)						(30,600,000)
Haynesville Shale [Member]
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward]
Proved Developed and Undeveloped Reserves, Purchases of Minerals in Place (Mcfe)						260,000,000
Proved Developed and Undeveloped Reserves, Extensions, Discoveries, and Additions (Mcfe)		84,900,000		48,700,000		10,200,000
Bossier Shale [Member]
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward]
Proved Developed and Undeveloped Reserves, Extensions, Discoveries, and Additions (Mcfe)		41,000,000		19,700,000
Shelby Area [Member]
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward]
Revisions to Proved Developed and Undeveloped Reserves due to other Factors (Mcfe)		36,700,000		67,100,000
Compass [Member]
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward]
Proved Developed and Undeveloped Reserves, Purchases of Minerals in Place (Mcfe)						24,600,000
Proved Developed and Undeveloped Reserves, Extensions, Discoveries, and Additions (Mcfe)						3,900,000
Proved Developed and Undeveloped Reserves, Sales of Minerals in Place (Mcfe)						(327,600,000)

[1] Purchases of reserves in place include the acquisition of certain proved developed producing properties in the Eagle Ford shale in connection with the Participation Agreement

[2] Purchases of reserves in place in 2014 consist primarily of our acquisition of certain proved developed producing properties in the Shelby area of East Texas.

[3] Purchases of reserves in place include 115.7 Bcfe in the Eagle Ford shale, 260.0 Bcfe in the Haynesville shale, and 24.6 Bcfe for our proportionate share of Compass's acquisition of shallow Cotton Valley assets in East Texas/North Louisiana.

[4] New discoveries and extensions in 2015 include 84.9 Bcfe and 41.0 Bcfe in the Haynesville shale and Bossier shale, respectively, related to our development of properties within the Shelby area of East Texas. Additionally, extensions and discoveries in 2015 included 24.7 Bcfe in the in the Haynesville shale related to the development of the Holly area in North Louisiana and 47.5 Bcfe in the Eagle Ford shale.

[5] New discoveries and extensions in 2014 included 48.7 Bcfe in the Haynesville shale, 26.1 Bcfe in the Eagle Ford Shale and 19.7 Bcfe in the Bossier shale. The discoveries and extensions within the Haynesville and Bossier shales primarily related to our development of properties within the Shelby area of East Texas.

[6] New discoveries and extensions in 2013 include 36.5 Bcfe in the Eagle Ford shale, 33.6 Bcfe in the Marcellus shale, 10.2 Bcfe in the Haynesville shale, 3.9 Bcfe for conventional properties held by Compass in the Permian Basin, and 1.5 Bcfe for shale properties in the Permian Basin.

[7] Total revisions due to Other factors include upward revisions of approximately 152.2 Bcfe in the North Louisiana Holly area and are primarily due to modifications in the well design to incorporate more proppant and longer laterals. The upward revisions also included 36.7 Bcfe from our East Texas region primarily due to strong results in both the Haynesville and Bossier shales based on our enhanced completion methods. The upward revisions also reflect a reduction in capital costs and operating expenses.

[8] Total revisions due to Other factors include upward revisions of approximately 67.1 Bcfe in the Shelby area, approximately 45.9 Bcfe in the Appalachia region, and approximately 5.8 Bcfe in the Holly area. The upward revisions were primarily due to improved well performance resulting from enhanced well designs and completion techniques.

[9] Total revisions due to Other factors were downward revisions primarily in the Haynesville shale as a result of operational matters including scaling, liquid loading due to high-line pressure and the impact of drainage on new wells drilled directly offset to the unit wells.

[10] Sales of reserves in place in 2014 consist primarily of the sale of our entire interest in Compass.

[11] Sales of reserves in place in 2013 include 327.6 Bcfe as a result of our contribution of properties to Compass and 30.6 Bcfe from the sale of undeveloped properties in the Eagle Ford in connection with the Participation Agreement.

[12] Beginning in 2015, we began reporting our NGLs as a component of natural gas as NGLs are not considered to be significant. Primarily all of our prior period NGLs were associated with properties owned by Compass, which EXCO divested in 2014. Prior period information has been conformed to be consistent with current period information.

[13] The above reserves do not include our equity interest in OPCO, which was not significant in any period presented.