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Debt and Financing Arrangements - Letters of Credit (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Available borrowing capacity $ 224,900  
Payments of Debt Obligations due by Period    
2017 18,750  
2018 21,094  
2019 28,125  
2020 30,470  
2021 271,874  
Long-term Debt 370,313  
Letters of credit    
Outstanding letter of credit 11,600 $ 14,400
Line of credit secured 8,600 $ 4,000
Maximum borrowing capacity $ 24,000