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Long-Term Debt (Senior Notes) (Narrative) (Details) (USD $)
 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2009
Dec. 31, 2010
Nov. 30, 2009
8.50% Senior Notes [Member]
Dec. 31, 2011
8.50% Senior Notes [Member]
Dec. 31, 2010
8.50% Senior Notes [Member]
Dec. 31, 2011
Prior To November 15, 2012 [Member]
8.50% Senior Notes [Member]
Dec. 31, 2011
Prior To November 15, 2013 [Member]
8.50% Senior Notes [Member]
Dec. 31, 2011
On Or After November 15, 2013 [Member]
Maximum [Member]
8.50% Senior Notes [Member]
Dec. 31, 2011
On Or After November 15, 2013 [Member]
Minimum [Member]
8.50% Senior Notes [Member]
Debt Instrument [Line Items]                    
Long-term debt outstanding $ 200,000,000   $ 200,000,000 $ 200,000,000            
Proceeds from issuance of debt, net of issuance costs 198,060,000 193,917,000   193,900,000            
Debt issuance costs, net         6,100,000          
Senior notes interest rate       8.50% 8.50%          
Senior notes, maturity date       Nov. 15, 2017            
Senior notes, interest payment commencement date         May 15, 2010          
Debt instrument, redeemable notes purchase price, percentage         101.00%   108.50% 100.00% 104.25% 100.00%
Maximum redeemable notes from qualified equity offering             35.00%      
Senior notes, fair value         $ 206,500,000 $ 225,000,000