Equity (Components Of Accumulated Other Comprehensive Income (Loss)) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Comprehensive Income Net Of Tax [Line Items]
Balance at beginning of year	$ 3,128		$ (6,896)	$ 4,797
Other Comprehensive Income Before Reclassifications Net Of Tax	2,148		10,024	(11,693)
Amounts Reclassified From Accumulated Other Comprehensive Income Net Of Tax	(627)	[1]
Net change in accumulated other comprehensive income	1,521
Balance at end of period	4,649		3,128	(6,896)
Provision for income taxes	30,754		84,656	82,360
Derivatives gain (loss), net of tax
Comprehensive Income Net Of Tax [Line Items]
Balance at beginning of year	0		(12)	(110)
Other Comprehensive Income Before Reclassifications Net Of Tax	0		12	98
Amounts Reclassified From Accumulated Other Comprehensive Income Net Of Tax	0	[1]
Net change in accumulated other comprehensive income	0
Balance at end of period	0		0	(12)
Foreigh currency translation gain (loss), net of tax
Comprehensive Income Net Of Tax [Line Items]
Balance at beginning of year	2,874		(6,078)	6,209
Other Comprehensive Income Before Reclassifications Net Of Tax	1,775		8,952	(12,287)
Amounts Reclassified From Accumulated Other Comprehensive Income Net Of Tax	0	[1]
Net change in accumulated other comprehensive income	1,775
Balance at end of period	4,649		2,874	(6,078)
Marketable securities, net of tax
Comprehensive Income Net Of Tax [Line Items]
Balance at beginning of year	254		(806)	(1,302)
Other Comprehensive Income Before Reclassifications Net Of Tax	373		1,060	496
Amounts Reclassified From Accumulated Other Comprehensive Income Net Of Tax	(627)	[1]
Net change in accumulated other comprehensive income	(254)
Balance at end of period	0		254	(806)
Amounts Reclassified From Accumulated Other Comprehensive Income, before tax	964
Provision for income taxes	$ 337

[1] ) The gain on marketable securities reclassified out of AOCI for the year ended December 31, 2013 is composed of a $964 gain and income tax expense of $337. The gain and income tax expense are included in “Other revenue” and “Provision for income taxes,” respectively, in the consolidated statements of income.