Summary Of Significant Accounting Policies (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011 years	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Letters of credit, outstanding	$ 8,300,000
Research and development expense	16,414,000	13,971,000	11,159,000
Reduce in research and development expense	3,500,000	5,100,000	3,500,000
Minimum vesting period (in years)	four
Maximum vesting period (in years)	six
Contractual term (in years)	10
Purchase of intangible assets other than goodwill, percentage	85.00%
Impairment of intangible assets	0
Amortization of software development costs	125,000	430,000	743,000
Cash and cash equivalents	1,326,000	2,114,000	9,696,000	1,762,000
Percentage of retention of billing	10.00%
Unbilled receivables	7,200,000	11,700,000
Retention payable after completion of the contract	1,900,000	2,400,000
Accounts receivable due from one customer		4,200,000
Likelihood percentage fair value of a reporting unit is less than its carrying amount	50.00%
Notional amount of performance guarantees outstanding	$ 61,300,000
Minimum [Member]
Length of ASP and software subscriptions (in years)	3
Appraisal project implementation	1
Maximum length of contract (in years)	3
Maximum [Member]
Length of ASP and software subscriptions (in years)	6
Appraisal project implementation	3
Maximum length of contract (in years)	5