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Senior Notes (Details)
12 Months Ended
Dec. 31, 2015
USD ($)
senior_note
Debt Disclosure [Abstract]  
Number of senior notes outstanding | senior_note 3
2022 Senior Notes  
Debt Instrument  
Senior Notes Redeemed, Canceled and Retired | $ $ 140,000,000.0
Stated interest rate 5.25%
Debt Instrument, Redemption Price, Percentage 100.00%