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Consolidated Statements Of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Net income	$ 725us-gaap_NetIncomeLoss	$ 4,486us-gaap_NetIncomeLoss	$ 2,575us-gaap_NetIncomeLoss	$ 1,892us-gaap_NetIncomeLoss	$ 105,338us-gaap_NetIncomeLoss	$ 237us-gaap_NetIncomeLoss	$ 6,368us-gaap_NetIncomeLoss	$ 1,738us-gaap_NetIncomeLoss	$ 9,678us-gaap_NetIncomeLoss	$ 113,681us-gaap_NetIncomeLoss	$ 37,050us-gaap_NetIncomeLoss
Unrealized losses on securities held as available for sale, net of tax:
Unrealized net holding losses arising during the period									0	0	(32)
Less: Reclassification adjustment for realized gains included in earnings									0	0	(230)
Foreign currency translation adjustments									(12,081)	(9,952)	2,969
Comprehensive income (loss)									$ (2,403)us-gaap_ComprehensiveIncomeNetOfTax	$ 103,729us-gaap_ComprehensiveIncomeNetOfTax	$ 39,757us-gaap_ComprehensiveIncomeNetOfTax