Segment Information (Schedule Of Income (Loss) From Operations By Geographic Area) (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Loss from operations	$ (565,921)	$ (34,637)	$ (23,842)	$ (17,524)	$ 4,228	$ 8,208	$ 4,362	$ 9,517	$ 17,976	$ 28,570	$ 16,796	$ 17,519	$ (641,924)	$ 26,315	$ 80,861
Subtotal [Member]
Segment Reporting Information [Line Items]
Loss from operations													(640,052)	27,398	82,393
Inter-Segment Elimination [Member]
Segment Reporting Information [Line Items]
Loss from operations													(1,872)	(1,083)	(1,532)
Americas [Member]
Segment Reporting Information [Line Items]
Loss from operations													(587,435)	(24,663)	43,743
Germany [Member]
Segment Reporting Information [Line Items]
Loss from operations													337	2,749	302
Other EMEA [Member]
Segment Reporting Information [Line Items]
Loss from operations													(82,593)	9,181	7,849
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Loss from operations													$ 29,639	$ 40,131	$ 30,499