Summary Of Significant Accounting Policies (Accumulated Amortization Of Other Intangibles) (Details) (USD $) In Thousands, unless otherwise specified											9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 Ecova [Member]	Dec. 31, 2012 Ecova [Member]	Sep. 30, 2013 Other Intangible Assets [Member]	Dec. 31, 2012 Other Intangible Assets [Member]	Sep. 30, 2013 Customer Relationships [Member]	Dec. 31, 2012 Customer Relationships [Member]	Sep. 30, 2013 Software and Software Development Costs [Member]	Dec. 31, 2012 Software and Software Development Costs [Member]	Sep. 30, 2013 Minimum [Member] Other Intangible Assets [Member]	Sep. 30, 2013 Minimum [Member] Customer Relationships [Member]	Sep. 30, 2013 Minimum [Member] Software and Software Development Costs [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life											1 year	2 years	3 years
Client relationships	$ 33,559	$ 32,059
Software development costs	38,148	33,990
Other	3,332	6,237
Total intangible assets	75,039	72,286
Total accumulated amortization	(33,886)	(26,030)			(2,248)	(1,680)	(11,255)	(7,793)	(20,383)	(16,557)
Total intangible assets - net	$ 41,153	$ 46,256	$ 40,400	$ 45,400