Segment And Geographic Information (Reconciliation Of Total Segment Income From Operations To Consolidated Income Before Income Taxes) (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, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting [Abstract]
Income from operations for reportable segments	$ 181,145	$ 254,028	$ 295,374	$ 229,280	$ 302,387	$ 306,761	$ 266,788	$ 248,055	$ 959,827	$ 1,123,991	$ 953,464
Interest expense									(34,656)	(37,352)	(18,082)
Other income, (expense), net									38,270	(2,721)	6,790
Income (Loss) from Continuing Operations before Income Taxes									$ 963,441	$ 1,083,918	$ 942,172