Reclassification of OCI (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Comprehensive Income Net Of Tax [Line Items]
Balance at beginning of year	$ 71,959		$ 4,649
Other Comprehensive Income before Reclassifications	(9,779)		533
Amounts Reclassified From Accumulated Other Comprehensive Income Net Of Tax	(81)	[1]
Net change in accumulated other comprehensive income	(9,860)		533
Balance at end of period	62,099		5,182
Provision for income taxes	4,912		3,822
Foreigh currency translation gain (loss), net of tax
Comprehensive Income Net Of Tax [Line Items]
Balance at beginning of year	0		4,649
Other Comprehensive Income before Reclassifications	0		533
Amounts Reclassified From Accumulated Other Comprehensive Income Net Of Tax	0	[1]
Net change in accumulated other comprehensive income	0		533
Balance at end of period	0		5,182
Marketable securities, net of tax
Comprehensive Income Net Of Tax [Line Items]
Balance at beginning of year	71,959		0
Other Comprehensive Income before Reclassifications	(9,779)		0
Amounts Reclassified From Accumulated Other Comprehensive Income Net Of Tax	(81)	[1]
Net change in accumulated other comprehensive income	(9,860)		0
Balance at end of period	62,099		0
Amounts Reclassified From Accumulated Other Comprehensive Income, before tax	126
Provision for income taxes	$ 45

[1] Includes a $126 impact of AOCI reclassification into “Gain on disposition of equity securities” for net gain on available-for-sale securities for the three months ended March 31, 2015. The tax impact of this reclassification was $45.