Equity (Schedule Of Restricted Stock Award And Restricted Stock Unit Activity) (Details) - $ / shares		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Restricted Stock Awards [Member]
Schedule of Restricted Stock Award and Restricted Stock Unit Activity [Line Items]
Unvested beginning balance		7,488	210,490	355,509
Granted		15,987	9,973	21,590
Vested	[1]	(15,480)	(68,420)	(89,006)
Forfeited		(1,328)	(144,555)	(77,603)
Unvested ending balance		6,667	7,488	210,490
Weighted average grant date fair value beginning balance		$ 15.61	$ 13.43	$ 13.37
Weighted average grant date fair value of granted		15.01	15.04	16.56
Weighted average grant date fair value of vested		15.30	15.03	14.81
Weighted average grant date fair value of forfeited		15.00	12.67	12.46
Weighted average grant date fair value ending balance		$ 15.00	$ 15.61	$ 13.43
Restricted Stock Units [Member]
Schedule of Restricted Stock Award and Restricted Stock Unit Activity [Line Items]
Unvested beginning balance		1,997,471	1,965,667	1,414,661
Granted		2,866,562	1,749,993	1,637,114
Vested	[1]	(505,025)	(541,888)	(329,542)
Forfeited		(1,270,630)	(1,176,301)	(756,566)
Unvested ending balance		3,088,378	1,997,471	1,965,667
Weighted average grant date fair value beginning balance		$ 15.78	$ 16.50	$ 20.61
Weighted average grant date fair value of granted		10.14	16.05	14.96
Weighted average grant date fair value of vested		16.20	17.64	21.52
Weighted average grant date fair value of forfeited		14.14	16.51	14.71
Weighted average grant date fair value ending balance		$ 10.75	$ 15.78	$ 16.50

[1] The RSAs vested during the years ended December 31, 2015, 2014, and 2013 consisted entirely of time-based awards. The RSUs vested during the year ended December 31, 2015 consisted of 67,893 performance-based awards and 437,132 time-based awards. The RSUs vested during the year ended December 31, 2014 consisted of 30,946 performance-based awards and 510,942 time-based awards. The RSUs vested during the year ended December 31, 2013 consisted of 52,288 performance-based awards and 277,254 time-based awards.