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Long-Term Debt (Maturities of Long-term Debt) (Details)
$ in Thousands
Mar. 31, 2016
USD ($)
Approximate Aggregate Maturities of Long-term Debt  
2017 $ 6,400
2018 6,400
2019 608,000
Thereafter 300,000
Total long-term debt, including current portion $ 920,800