Stock-Based Compensation (Schedule Of Non-Cash Compensation Expense) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total cost of non-cash compensation included in loss before provision for income taxes	$ 22,671	$ 17,205	$ 13,968
Amount charged against loss	22,671	17,205	13,968
Cost of Revenues [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total cost of non-cash compensation included in loss before provision for income taxes	386	230	187
Selling, General And Administrative Expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total cost of non-cash compensation included in loss before provision for income taxes	$ 22,285	$ 16,975	$ 13,781