Interest And Other Income (Interest And Other Income) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Interest and Other Income [Abstract]
Other income	$ 8,282,000		$ 5,382,000		$ 9,125,000
Equity interest in income (loss) of EFS Midstream	7,266,000		2,183,000		1,925,000
Deferred compensation plan income	5,954,000		1,872,000		1,657,000
Interest income	321,000		1,465,000		697,000
Third-party income from vertical integration services	(4,862,000)	[1]	(11,934,000)	[1]	15,978,000	[1]
Total interest and other income	16,961,000		(1,032,000)		29,382,000
GrossRevenuesIncludedInThirdPartyIncomeFromVerticalIntegrationServices	284,900,000		247,800,000		50,900,000
GrossExpensesIncludedInThirdPartyIncomeFromVerticalIntegrationServices	$ 289,800,000		$ 259,700,000		$ 34,900,000

[1] Income (loss) from vertical integration services represent net margins that result from Company-provided fracture stimulation, drilling and related service operations, which are ancillary to and supportive of the Company's oil and gas joint operating activities, and do not represent intercompany transactions. For the three years ended December 31, 2013, 2012 and 2011, these net margins include $284.9 million, $247.8 million and $50.9 million of gross vertical integration revenues, respectively and $289.8 million, $259.7 million and $34.9 million of total vertical integration costs and expenses, respectively.