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Debt - Narrative (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2016
USD ($)
Maximum [Member]  
Debt Instrument [Line Items]  
Debt instrument, face amount $ 915,000
Senior Notes [Member]  
Debt Instrument [Line Items]  
Debt instrument, face amount $ 375,000
Debt instrument, interest rate, stated percentage 4.75%
Debt instrument maturity date Jul. 15, 2022
Surplus Note [Member]  
Debt Instrument [Line Items]  
Debt instrument, face amount $ 454,000
Debt instrument, interest rate, stated percentage 4.50%
Debt instrument maturity date Dec. 31, 2029