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Long-Term Obligations - Schedule of Long-Term Debt Maturities (Details)
$ in Thousands
Mar. 31, 2017
USD ($)
Debt Instrument [Line Items]  
2017 $ 27,500
2018 44,000
2019 55,000
2020 77,000
2021 1,105,000
Thereafter 0
Revolving loans  
Debt Instrument [Line Items]  
2017 0
2018 0
2019 0
2020 0
2021 445,000
Thereafter 0
Senior term notes  
Debt Instrument [Line Items]  
2017 27,500
2018 44,000
2019 55,000
2020 77,000
2021 660,000
Thereafter $ 0