Segment And Geographic Information (Narrative) (Details) $ in Thousands	3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 30, 2015 USD ($) region	Sep. 30, 2014 USD ($)	Jun. 30, 2015 region	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of geographic regions where products are sold | region	3		4
Total sales	$ 299,812	$ 313,701		$ 891,117	$ 911,086
Property and equipment, net	260,775			260,775		$ 264,086
Outside The United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total sales	180,000	$ 191,000		544,000	$ 569,000
Property and equipment, net	$ 140,000			$ 140,000		$ 145,000