Reclassification of OCI (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013		Sep. 30, 2014	Sep. 30, 2013
Comprehensive Income Net Of Tax [Line Items]
Balance at beginning of year	$ 7,998	$ (362)		$ 4,649	$ 3,128
Other Comprehensive Income before Reclassifications	5,973	2,976		2,624	113
Amounts Reclassified From Accumulated Other Comprehensive Income Net Of Tax	(48)	0	[1]	(48)	(627)	[1]
Net change in accumulated other comprehensive income	(5,925)	(2,976)		(2,576)	514
Balance at end of period	2,073	2,614		2,073	2,614
Provision (benefit) for income taxes	11,478	(28,013)		50,658	12,727
Foreigh currency translation gain (loss), net of tax
Comprehensive Income Net Of Tax [Line Items]
Balance at beginning of year	7,998	(362)		4,649	2,874
Other Comprehensive Income before Reclassifications	5,973	2,976		2,624	(260)
Amounts Reclassified From Accumulated Other Comprehensive Income Net Of Tax	(48)	0	[1]	(48)	0	[1]
Net change in accumulated other comprehensive income	(5,925)	(2,976)		(2,576)	260
Balance at end of period	2,073	2,614		2,073	2,614
Amounts Reclassified From Accumulated Other Comprehensive Income, before tax				(74)
Provision (benefit) for income taxes				(26)
Marketable securities, net of tax
Comprehensive Income Net Of Tax [Line Items]
Balance at beginning of year	0	0		0	254
Other Comprehensive Income before Reclassifications	0	0		0	373
Amounts Reclassified From Accumulated Other Comprehensive Income Net Of Tax	0	0	[1]	0	(627)	[1]
Net change in accumulated other comprehensive income	0	0		0	254
Balance at end of period	0	0		0	0
Amounts Reclassified From Accumulated Other Comprehensive Income, before tax				964
Provision (benefit) for income taxes				$ 337

[1] pact of this reclassification was $337.