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Long-Term Obligations Maturities of Long-term debt (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Second Amended and Restated Credit Agreement | Revolving Credit Facility | Fifth Third Bank | Line of Credit  
Debt Instrument [Line Items]  
2018 $ 0
2019 179,900
2020 0
2021 0
2022 0
Thereafter 0
Total 179,900
2025 Notes | Senior Notes  
Debt Instrument [Line Items]  
2018 0
2019 0
2020 0
2021 0
2022 0
Thereafter 250,000
Total $ 250,000