Summary of Significant Accounting Policies (Narrative) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2016 USD ($)
Significant Accounting Policies [Line Items]
Number of days to exceed for customary payment terms	90 days
Contract term (in years) of the maintenance services	1 year
Contract term (in years) of fixed-rate programs	1 year
Customary Advanced Billing Period	1 year
Minimum [Member]
Significant Accounting Policies [Line Items]
Recognition period (in years) of revenue from hosting services	1 year
Recognition period (in years) of revenue from cloud-based solutions	1 year
Maximum [Member]
Significant Accounting Policies [Line Items]
Recognition period (in years) of revenue from hosting services	3 years
Recognition period (in years) of revenue from cloud-based solutions	3 years
ASU 2015-03 [Member]
Significant Accounting Policies [Line Items]
New accounting pronouncement, cumulative effect of change on equity or net assets	$ 0.5