Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ 291	$ 2,919
Other comprehensive income before reclassifications	(2,038)	(4,622)
Amounts reclassified from accumulated other comprehensive income	83	39
Net increase (decrease) in other comprehensive income	(1,955)	(4,583)
Ending balance	(1,664)	(1,664)
Foreign currency items [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(908)	1,381
Other comprehensive income before reclassifications	30	(2,259)
Amounts reclassified from accumulated other comprehensive income	0	0
Net increase (decrease) in other comprehensive income	30	(2,259)
Ending balance	(878)	(878)
Change in unrealized gains on available for sale securities [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	1,199	1,538
Other comprehensive income before reclassifications	(2,068)	(2,363)
Amounts reclassified from accumulated other comprehensive income	83	39
Net increase (decrease) in other comprehensive income	(1,985)	(2,324)
Ending balance	$ (786)	$ (786)