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Debt and Credit Facilities 5.375% Senior Notes due 2020 (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Sep. 30, 2018
Jan. 31, 2017
Dec. 31, 2018
Sep. 30, 2018
Jan. 09, 2017
Oct. 22, 2012
Aug. 14, 2012
Debt Instrument [Line Items]              
Debt Instrument, Face Amount $ 2,437,000   $ 2,437,000 $ 2,437,000      
Document Period End Date     Dec. 31, 2018        
5.375% Senior Notes due August 15, 2020              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount 300,000     300,000 $ 450,000    
Senior Notes, Noncurrent $ 298,759   $ 298,925 $ 298,759   $ 350,000 $ 700,000
Debt Instrument, Interest Rate, Stated Percentage 5.375%   5.375% 5.375%     5.375%
Unamortized Debt Issuance Expense $ 1,241   $ 1,075 $ 1,241      
Repayments of Debt $ 150,000 $ 600,000          
Loss on extinguishment of debt   $ (18,600)   $ (300)