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Debt Debt (Schedule of Long Term Debt Maturities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Schedule of Long Term Debt Maturities [Abstract]    
Long-term Debt, Maturities, Repayments of Principal in Next Rolling Twelve Months $ 768  
Long-term Debt, Maturities, Repayments of Principal in Rolling Year Two 794  
Long-term Debt, Maturities, Repayments of Principal in Rolling Year Three 821  
Long-term Debt, Maturities, Repayments of Principal in Rolling Year Four 849  
Long-term Debt, Maturities, Repayments of Principal in Rolling Year Five 284,878  
Long-term Debt, Maturities, Repayments of Principal in Rolling after Year Five 645,582  
Long-term Debt, Gross 933,692  
Debt Instrument, Unamortized Discount (7,435)  
Debt, Long-term and Short-term, Combined Amount $ 926,257 $ 862,726