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Revolving Credit Facility Narrative (Details) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Debt Disclosure [Abstract]    
Maximum borrowing capacity $ 175,000,000  
Line of credit facility expiration date Feb. 28, 2015  
Line of Credit Facility, Amount Outstanding 52,000,000  
Line of Credit Facility, Remaining Borrowing Capacity 123,000,000  
Repayments of Lines of Credit $ (50,500,000) $ (18,900,000)