Condensed Consolidating Financial Information (Schedule Of Condensed Consolidating Statement Of Cash Flows) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Net cash provided by operating activities - continuing operations	$ 91,182	$ 83,678
Net cash used in investing activities - continuing operations	(191,961)	(216,680)
Net cash provided by financing activities - continuing operations	693	129,463
Net cash provided by (used in) discontinued operations	119,118	(1,004)
Net increase (decrease) in cash and cash equivalents	19,032	(4,543)
CASH AND CASH EQUIVALENTS, beginning of period	52,614	28,112
CASH AND CASH EQUIVALENTS, end of period	71,646	23,569
Parent Company [Member]
Net cash provided by operating activities - continuing operations	(8,924)	30,071
Net cash used in investing activities - continuing operations	(91,671)	(192,616)
Net cash provided by financing activities - continuing operations	693	143,578
Net cash provided by (used in) discontinued operations	119,637	0
Net increase (decrease) in cash and cash equivalents	19,735	(18,967)
CASH AND CASH EQUIVALENTS, beginning of period	51,894	19,134
CASH AND CASH EQUIVALENTS, end of period	71,629	167
Combined Guarantor Subsidiaries [Member]
Net cash provided by operating activities - continuing operations	100,106	53,607
Net cash used in investing activities - continuing operations	(238,759)	(178,270)
Net cash provided by financing activities - continuing operations	138,469	140,091
Net cash provided by (used in) discontinued operations	0	0
Net increase (decrease) in cash and cash equivalents	(184)	15,428
CASH AND CASH EQUIVALENTS, beginning of period	201	7,263
CASH AND CASH EQUIVALENTS, end of period	17	22,691
Combined Non-Guarantor Subsidiaries [Member]
Net cash provided by operating activities - continuing operations	0	0
Net cash used in investing activities - continuing operations	0	0
Net cash provided by financing activities - continuing operations	0	0
Net cash provided by (used in) discontinued operations	(519)	(1,004)
Net increase (decrease) in cash and cash equivalents	(519)	(1,004)
CASH AND CASH EQUIVALENTS, beginning of period	519	1,715
CASH AND CASH EQUIVALENTS, end of period	0	711
Eliminations [Member]
Net cash provided by operating activities - continuing operations	0	0
Net cash used in investing activities - continuing operations	138,469	154,206
Net cash provided by financing activities - continuing operations	(138,469)	(154,206)
Net cash provided by (used in) discontinued operations	0	0
Net increase (decrease) in cash and cash equivalents	0	0
CASH AND CASH EQUIVALENTS, beginning of period	0	0
CASH AND CASH EQUIVALENTS, end of period	$ 0	$ 0