Equity AOCI (Details) - USD ($) $ in Thousands		3 Months Ended			6 Months Ended
		Jun. 30, 2015		Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Comprehensive Income Net Of Tax [Line Items]
Balance at beginning of year		$ 62,099		$ 5,182	$ 71,959	$ 4,649
Other Comprehensive Income before Reclassifications		(3,741)		2,816	(13,520)	3,349
Amounts Reclassified From Accumulated Other Comprehensive Income Net Of Tax	[1]	(709)			(790)
Net change in accumulated other comprehensive income		(4,450)		2,816	(14,310)	3,349
Balance at end of period		57,649		7,998	57,649	7,998
Gain on disposition of equity securities		1,099		0	1,225
Provision (benefit) for income taxes		1,189		(5,303)	6,101	(1,481)
Foreigh currency translation gain (loss), net of tax
Comprehensive Income Net Of Tax [Line Items]
Balance at beginning of year		0		5,182	0	4,649
Other Comprehensive Income before Reclassifications		0		2,816	0	3,349
Amounts Reclassified From Accumulated Other Comprehensive Income Net Of Tax		0	[1]		0
Net change in accumulated other comprehensive income		0		2,816	0	3,349
Balance at end of period		0		7,998	0	7,998
Marketable securities, net of tax
Comprehensive Income Net Of Tax [Line Items]
Balance at beginning of year		62,099		0	71,959	0
Other Comprehensive Income before Reclassifications		(3,741)		0	(13,520)	0
Amounts Reclassified From Accumulated Other Comprehensive Income Net Of Tax	[1]	(709)			(790)
Net change in accumulated other comprehensive income		(4,450)		0	(14,310)	0
Balance at end of period		57,649		$ 0	57,649	$ 0
Provision (benefit) for income taxes		$ 390			$ 435

[1] Includes a $1,099 and $1,225 impact of AOCI reclassification into “Gain on disposition of equity securities” for net gain on available-for -sale securities for the three and six months ended June 30, 2015, respectively. For the three and six months ended June 30, 2015, the tax impact of this reclassification was $390 and $435, respectively.