Debt And Other Long-Term Liabilities (Narrative Term Loan And Revolver) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Line Of Credit Facility [Line Items]
Line of credit facility, initiation date	Jul. 15, 2011
Credit facility term	5 years
Line of credit facility option to increase borrowing capacity	$ 250.0
Credit facility maturity date	Jul. 15, 2016
Line of credit facility, covenant terms	The credit facility is secured by a first priority security interest in substantially all of our assets and the assets of our domestic subsidiaries, as well as a pledge of a substantial portion of certain equity interests in our subsidiaries. As of March 31, 2013, there was no outstanding revolving line of credit borrowing and we were in compliance with the covenants of the credit facility.
Base Rate [Member]
Line Of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate	0.25%
LIBOR Rate [Member]
Line Of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate	1.25%
Revolving Credit Facility [Member]
Line Of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	450.0
Line of credit facility, amount outstanding	0
Term Loan [Member]
Line Of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	175.0
Line of credit facility total amount borrowed	$ 175.0
Term loan interest rate	1.45%