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Long-Term Debt - Maturity Schedule (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]  
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months $ 14,588
Long-term Debt, Maturities, Repayments of Principal in Year Two 33,625
Long-term Debt, Maturities, Repayments of Principal in Year Three 10,408
Long-term Debt, Maturities, Repayments of Principal in Year Four 5,349
Long-term Debt, Maturities, Repayments of Principal in Year Five 4,500
Long-term Debt, Maturities, Repayments of Principal after Year Five $ 428,625