Long-Term Debt And Other Long-Term Liabilities (Long-Term Debt) (Details) (USD $)	6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Credit Agreement	$ 0	$ 0
6.625% senior subordinated notes due 2021, net of unamortized discount of $4.1 million at June 30, 2014 and $4.3 million at December 31, 2013	645,925,000	645,696,000
Total long-term debt	645,925,000	645,696,000
Revolving credit facility interest rate	0.00%	0.00%
Interest percentage of senior subordinated notes	6.625%
Debt instrument maturity date	May 15, 2021
Debt instrument, unamortized discount	$ 4,100,000	$ 4,300,000