Summary Of Significant Accounting Policies (Accumulated Amortization Of Other Intangibles) (Details) (USD $) In Thousands, unless otherwise specified											3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Ecova [Member]	Dec. 31, 2013 Ecova [Member]	Mar. 31, 2014 Other Intangible Assets [Member]	Dec. 31, 2013 Other Intangible Assets [Member]	Mar. 31, 2014 Customer Relationships [Member]	Dec. 31, 2013 Customer Relationships [Member]	Mar. 31, 2014 Software and Software Development Costs [Member]	Dec. 31, 2013 Software and Software Development Costs [Member]	Mar. 31, 2014 Minimum [Member] Other Intangible Assets [Member]	Mar. 31, 2014 Minimum [Member] Customer Relationships [Member]	Mar. 31, 2014 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	$ 33,562	$ 33,562
Software development costs	41,146	39,327
Other	3,312	3,321
Total intangible assets	78,020	76,210
Total accumulated amortization	(39,410)	(36,634)			(2,626)	(2,437)	(13,347)	(12,336)	(23,437)	(21,861)
Total intangible assets - net	$ 38,610	$ 39,576	$ 38,610	$ 39,576