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Debt - Long-Term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Nov. 21, 2014
Debt Instrument [Line Items]      
4.650% Senior Notes due 2024 $ 500,000 $ 500,000 $ 500,000
Unamortized Debt Issuance Expense (6,073) (6,761)  
Fair Value Hedge Liabilities 1,909 230  
Term Loan Facility 300,000 250,000  
Revolving credit facility 0 0  
Long-term Debt $ 795,836 $ 743,469  
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate     4.65%