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Debt And Other Long-Term Liabilities (Narrative Senior Unsecured Notes) (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Debt Instrument [Line Items]    
Proceeds from issurance of senior unsecured notes $ 343,769,000 $ 0
Senior Unsecured Notes [Member]
   
Debt Instrument [Line Items]    
Date entered into indenture Mar. 12, 2013  
Senior unsecured note, face amount 350,000,000  
Proceeds from issurance of senior unsecured notes $ 343,800,000  
Interest rate, per year 6.00%  
Debt Instrument, Maturity Date Mar. 15, 2019  
Percentage of principal amount of notes required to be offered to purchase the Notes upon a change in control 101.00%  
Percentage of principal amount of notes required to be offered to purchase the Notes if certain asset sales are made 100.00%  
Minimum percentage of aggregate principal amount of Notes required to declare the principal amount plus accrued and unpaid interest on the Notes to be immediately due and payable in event of default 25.00%  
Debt instrument, covenant description The terms of the Notes restrict our ability and the ability of certain of its subsidiaries to, among other things: incur additional indebtedness; create liens; pay dividends or make distributions in respect of capital stock; purchase or redeem capital stock; make investments or certain other restricted payments; sell assets; enter into transactions with stockholders or affiliates; or effect a consolidation or merger. However, these and other limitations set forth in the Indenture will be subject to a number of important qualifications and exceptions.  
Senior Unsecured Notes [Member] | Period, March 15, 2016 To March 14, 2017 [Member]
   
Debt Instrument [Line Items]    
Redemption rate applicable to periods 103.00%  
Senior Unsecured Notes [Member] | Period, March 15, 2017 To March 14, 2018 [Member]
   
Debt Instrument [Line Items]    
Redemption rate applicable to periods 101.50%  
Senior Unsecured Notes [Member] | Period, March 15, 2018 To March 15, 2019 [Member]
   
Debt Instrument [Line Items]    
Redemption rate applicable to periods 100.00%  
Senior Unsecured Notes [Member] | Period, March 12, 2013 To March 14, 2016 [Member]
   
Debt Instrument [Line Items]    
Redemption rate applicable to periods 100.00%  
Redemption rate with proceeds of certain equity offerings 106.00%  
Maximum aggregate principal amount of notes redeemable 35.00%  
Minimum aggregate principal amount of Notes outstanding after redemption 65.00%  
Convertible Debt [Member]
   
Debt Instrument [Line Items]    
Interest rate, per year 4.00%  
Debt Instrument, Maturity Date Sep. 01, 2014