Condensed Consolidated Statements Of Income Condensed Consolidated Statements of Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Allocated Share-based Compensation Expense	$ 2,191	$ 2,425	$ 6,538	$ 7,108
Cost of Sales [Member]
Allocated Share-based Compensation Expense	82	162	263	581
Selling and Marketing Expense [Member]
Allocated Share-based Compensation Expense	443	465	1,360	1,315
Research and Development Expense [Member]
Allocated Share-based Compensation Expense	175	103	537	311
General and Administrative Expense [Member]
Allocated Share-based Compensation Expense	$ 1,491	$ 1,695	$ 4,378	$ 4,901