Income Tax (Summary Of The Activity Related To Unrecognized Tax Benefits) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax [Abstract]
Unrecognized tax benefits – gross beginning balance	$ 2,171	$ 1,974	$ 8,058
Gross increases – prior period tax positions	193	197
Gross increases – current period tax positions			151
Settlements			(6,235)
Unrecognized tax benefits – gross ending balance	$ 2,364	$ 2,171	$ 1,974