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Long-Term Debt - Credit Facilities (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Debt Disclosure [Abstract]    
Credit facility outstanding $ 0 $ 222,500
Available for borrowings 1,050,000 1,177,500
Total borrowing commitments 1,050,000 1,400,000
Maximum amount outstanding at any month-end 214,500 685,000
Average daily amount outstanding $ 44,938 $ 358,929
Average daily amount outstanding (percent) 1.72% 1.60%
Amount outstanding at period-end (percent) 0.00% 1.64%