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Long-Term Debt (Maturities of Long-term Debt) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Mar. 31, 2015
Debt Disclosure [Abstract]    
2016 (remaining three months ending March 31, 2016) $ 0  
2017 0  
2018 0  
2019 6,969  
2020 258,525  
Thereafter 1,212,006  
Long-term debt, gross $ 1,477,500 $ 1,593,600