Condensed Consolidating Financial Information (Schedule Of Condensed Consolidating Statement Of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Condensed Income Statements, Captions [Line Items]
Total revenues	$ 107,324	$ 123,494	$ 188,586	$ 223,544
Total costs and expenses	369,258	196,567	761,794	329,531
Income (loss) from continuing operations before income taxes	(261,934)	(73,073)	(573,208)	(105,987)
Income tax (expense) benefit	(192)	26,103	(313)	37,541
Equity (deficit) in income of subsidiaries	0	0	0	0
Income (loss) from continuing operations	(262,126)	(46,970)	(573,521)	(68,446)
Income (loss) from discontinued operations, net of income taxes	0	838	0	1,104
Net Income (loss)	(262,126)	(46,132)	(573,521)	(67,342)
Eliminations [Member]
Condensed Income Statements, Captions [Line Items]
Total revenues	0	0	0	0
Total costs and expenses	(11)	(6,469)	365	(5,301)
Income (loss) from continuing operations before income taxes	11	6,469	(365)	5,301
Income tax (expense) benefit	(192)	(1,737)	(313)	(1,410)
Equity (deficit) in income of subsidiaries	169,092	(10,817)	450,193	(7,132)
Income (loss) from continuing operations	168,911	(6,085)	449,515	(3,241)
Income (loss) from discontinued operations, net of income taxes	0	0	0	0
Net Income (loss)	168,911	(6,085)	449,515	(3,241)
Parent Company [Member] | Reportable Legal Entities [Member]
Condensed Income Statements, Captions [Line Items]
Total revenues	129	660	244	1,250
Total costs and expenses	92,982	96,843	122,894	123,511
Income (loss) from continuing operations before income taxes	(92,853)	(96,183)	(122,650)	(122,261)
Income tax (expense) benefit	0	33,664	0	42,792
Equity (deficit) in income of subsidiaries	(169,092)	10,817	(450,193)	7,132
Income (loss) from continuing operations	(261,945)	(51,702)	(572,843)	(72,337)
Income (loss) from discontinued operations, net of income taxes	0	838	0	1,104
Net Income (loss)	(261,945)	(50,864)	(572,843)	(71,233)
Combined Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]
Condensed Income Statements, Captions [Line Items]
Total revenues	107,195	122,891	188,342	222,294
Total costs and expenses	276,287	106,409	638,535	211,321
Income (loss) from continuing operations before income taxes	(169,092)	16,482	(450,193)	10,973
Income tax (expense) benefit	0	(5,769)	0	(3,841)
Equity (deficit) in income of subsidiaries	0	0	0	0
Income (loss) from continuing operations	(169,092)	10,713	(450,193)	7,132
Income (loss) from discontinued operations, net of income taxes	0	0	0	0
Net Income (loss)	(169,092)	10,713	(450,193)	7,132
Combined Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]
Condensed Income Statements, Captions [Line Items]
Total revenues	0	(57)	0	0
Total costs and expenses	0	(216)	0	0
Income (loss) from continuing operations before income taxes	0	159	0	0
Income tax (expense) benefit	0	(55)	0	0
Equity (deficit) in income of subsidiaries	0	0	0	0
Income (loss) from continuing operations	0	104	0	0
Income (loss) from discontinued operations, net of income taxes	0	0	0	0
Net Income (loss)	$ 0	$ 104	$ 0	$ 0