Summary Of Operations And Significant Accounting Policies (Summary Of Financial Information By Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Segment Reporting Information [Line Items]
Hosted services - Business	$ 36,144	$ 31,240
Hosted services - Consumer	3,620	3,848
Professional services	2,732	1,671
Total revenue	42,496	36,759
Cost of revenue	10,134	7,923
Sales and marketing	14,478	11,089
Amortization of intangibles	224	77
Unallocated corporate expenses	18,259	12,782
(Loss) income from operations	(599)	4,888
Corporate
Segment Reporting Information [Line Items]
Hosted services - Business
Hosted services - Consumer
Professional services
Total revenue
Cost of revenue
Sales and marketing
Amortization of intangibles
Unallocated corporate expenses	18,259	12,782
(Loss) income from operations	(18,259)	(12,782)
Business
Segment Reporting Information [Line Items]
Hosted services - Business	36,144	31,240
Hosted services - Consumer
Professional services	2,732	1,671
Total revenue	38,876	32,911
Cost of revenue	9,536	7,368
Sales and marketing	13,206	9,489
Amortization of intangibles	224	77
Unallocated corporate expenses
(Loss) income from operations	15,910	15,977
Consumer
Segment Reporting Information [Line Items]
Hosted services - Business
Hosted services - Consumer	3,620	3,848
Professional services
Total revenue	3,620	3,848
Cost of revenue	598	555
Sales and marketing	1,272	1,600
Amortization of intangibles
Unallocated corporate expenses
(Loss) income from operations	$ 1,750	$ 1,693