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Long-Term Debt And Other Long-Term Liabilities (Narrative) (Details) (USD $)
 0 Months Ended 1 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Sep. 13, 2011
May 18, 2011
Dec. 31, 2011
Dec. 31, 2010
Sep. 13, 2011
Minimum [Member]
Dec. 31, 2011
Minimum [Member]
Sep. 13, 2011
Maximum [Member]
Dec. 31, 2011
Maximum [Member]
Dec. 31, 2011
Senior Unsecured Credit Facility [Member]
May 18, 2011
Senior Notes, 6.625% Due 2021 [Member]
Dec. 31, 2011
Senior Notes, 6.625% Due 2021 [Member]
Dec. 31, 2011
Line Of Credit Facility Lender Determined Amount [Member]
Dec. 31, 2011
Line Of Credit Facility Commitment Amount [Member]
Debt Instrument [Line Items]                          
Credit facility maximum credit amount     $ 750,000,000                    
Credit facility maturity date     May 24, 2012           September 13, 2016        
Credit facility current credit amount                       600,000,000 250,000,000
Commitment fee percentage under credit facility         0.375%   0.50%            
Commitment fee under credit facility standard 1.00%                        
Origination, agency and syndication fees     1,800,000                    
LIBOR plus interest rate           1.75%   2.50%          
LIBOR interest rate plus one percent     LIBOR plus 1.00%                    
Outstanding borrowings subject to LIBOR     50,000,000                    
Payments of dividends exceeding percentage     30.00%                    
Current ratio of credit facility     1 to 1                    
Leverage ratio of long-term debt     4 to 1                    
6.625% senior subordinated notes due 2021     250,000,000 0                  
Interest percentage of senior subordinated notes     6.625%                    
Debt instrument maturity date     2021                    
Senior subordinated notes maturity period                     May 15, 2021    
Proceeds from sale of notes                   244,000,000      
Aggregate principal amount                   250,000,000      
Deducting fees for debt issuance     6,000,000                    
Repayment of outstanding borrowings under unsecured credit facility   220,300,000                      
Significant restrictions on received funds from subsidiaries     0                    
Debt instrument redemption date     May 15, 2016                    
Percentage of maximum, aggregate principal equity amount     35.00%                    
Proceed from equity offerings redemption price percentage     106.625%                    
Minimum redemption percentage of debt outstanding     65.00%                    
Equal redemption price percentage of principal amount of debt     100.00%                    
Senior notes repurchase price in percentage     101.00%                    
2012     12,200,000                    
2013     3,100,000                    
2014     20,000,000                    
2015     2,900,000                    
2016     $ 52,900,000