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Debt (Repayments of Debt) (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Debt Disclosure [Abstract]  
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months $ 402,802
Long-term Debt, Maturities, Repayments of Principal in Year Two 2,919
Long-term Debt, Maturities, Repayments of Principal in Year Three 403,040
Long-term Debt, Maturities, Repayments of Principal in Year Four 3,167
Long-term Debt, Maturities, Repayments of Principal in Year Five 403,299
Long-term Debt, Maturities, Repayments of Principal after Year Five $ 1,593,674