Long-Term Debt And Other Long-Term Liabilities (Long-Term Debt) (Details) (USD $)	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Credit agreement with an average interest rate of 4.0% at September 30, 2014	$ 30,800,000	$ 0
6.625% senior subordinated notes due 2021, net of unamortized discount of $4.0 million at September 30, 2014 and $4.3 million at December 31, 2013	646,043,000	645,696,000
Total long-term debt	676,843,000	645,696,000
Revolving credit facility interest rate	4.00%	0.00%
Interest percentage of senior subordinated notes	6.625%
Debt instrument maturity date	May 15, 2021
Debt instrument, unamortized discount	$ 4,000,000	$ 4,300,000