Geographic And Customer Information (Comparison Of Property And Equipment, Net, By Geographic Region) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment, net	$ 319,028	$ 339,653
U.S. [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment, net	308,563	325,636
EMEA [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment, net	9,919	13,317
APAC [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment, net	$ 546	$ 700