PROPERTIES AND EQUIPMENT Impairment of Natural Gas and Crude Oil Properties (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Continuing Operations:
Impairment of proved properties									$ 48,750	$ 0	$ 0
Impairment of significantly unproved properties									1,082	1,629	1,108
Amortization of Individually Insignificant Unproved Properties									3,603	4,266	1,193
Total continuing operations	1,002	4,472	1,502	46,459	4,563	388	356	588	53,435	5,895	2,301
Discontinued operations:
Impairment of proved properties									0	161,185	22,460
Impairment of individually significant unproved properties from discontinued operations									0	313	0
Amortization of Individually Insignificant Unproved Properties, discontinued operations									3	756	398
Total discontinued operations									3	162,254	22,858
Total impairment of natural gas and crude oil properties									53,438	168,149	25,159
Shallow Upper Devonian properties
Continuing Operations:
Impairment of proved properties		$ 3,800		$ 45,000