INCOME TAXES (Deferred Tax Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Deferred tax assets:
Net operating loss carryforwards	$ 14,361	$ 18,610
Capital loss carryforwards	16,404	16,175
Accrued expenses	6,864	7,988
Other assets	7,818us-gaap_DeferredTaxAssetsOther	4,893us-gaap_DeferredTaxAssetsOther
R&D credit	3,705	2,824
Foreign tax credits	25,799	25,305
Gross deferred tax assets	74,951us-gaap_DeferredTaxAssetsGross	75,795us-gaap_DeferredTaxAssetsGross
Valuation allowance	(27,503)	(29,087)	(26,561)	(24,145)
Total deferred tax assets	47,448us-gaap_DeferredTaxAssetsNet	46,708us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities:
Property and equipment	(15,751)	(19,308)
Intangible assets	(44,188)	(39,639)
Other liabilities	(2,190)us-gaap_DeferredTaxLiabilitiesOther	(2,375)us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities	(62,129)us-gaap_DeferredTaxLiabilities	(61,322)us-gaap_DeferredTaxLiabilities
Deferred income taxes, net	$ (14,681)us-gaap_DeferredTaxAssetsLiabilitiesNet	$ (14,614)us-gaap_DeferredTaxAssetsLiabilitiesNet

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