Income Taxes (Summary Of Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of year	$ (6,262)	$ (10,322)	$ (11,515)
Additions based on tax positions related to the current year	(30,712)	(2,940)	(309)
Reductions based on tax positions related to the current year	102	581	995
Additions for tax positions of prior years	(2,128)	(1,037)	(1,090)
Reductions for tax positions of prior years	1,990	2,495	959
Settlements	0	4,961	638
Balance at end of year	$ (37,010)	$ (6,262)	$ (10,322)