Property and Equipment (Components Of Property and Equipment) (Details) (USD $) In Thousands, unless otherwise specified															12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Equipment	Dec. 31, 2011 Equipment	Dec. 31, 2012 Computer Software	Dec. 31, 2011 Computer Software	Dec. 31, 2012 Buildings	Dec. 31, 2011 Buildings	Dec. 31, 2012 Leasehold Improvements	Dec. 31, 2011 Leasehold Improvements	Dec. 31, 2012 Furniture	Dec. 31, 2011 Furniture	Dec. 31, 2012 Land	Dec. 31, 2011 Land	Dec. 31, 2012 Minimum [Member]	Dec. 31, 2012 Minimum [Member] Equipment	Dec. 31, 2012 Minimum [Member] Computer Software	Dec. 31, 2012 Minimum [Member] Buildings	Dec. 31, 2012 Minimum [Member] Leasehold Improvements	Dec. 31, 2012 Minimum [Member] Furniture	Dec. 31, 2012 Maximum [Member]	Dec. 31, 2012 Maximum [Member] Equipment	Dec. 31, 2012 Maximum [Member] Computer Software	Dec. 31, 2012 Maximum [Member] Buildings	Dec. 31, 2012 Maximum [Member] Leasehold Improvements	Dec. 31, 2012 Maximum [Member] Furniture
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 115,535	$ 106,549	$ 59,580	$ 55,221	$ 26,864	$ 26,709	$ 15,122	$ 10,469	$ 7,334	$ 7,394	$ 4,457	$ 5,007	$ 2,178	$ 1,749
Less: Accumulated depreciation and amortization	(63,282)	(60,911)
Property and equipment, net	$ 52,253	$ 45,638
Property and equipment, estimated useful lives (years)															1 year	1 year	1 year	10 years	1 year	1 year	40 years	10 years	5 years	40 years	10 years	13 years