Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - Debt Redemption (Details)

v3.19.1
Long-Term Debt - Debt Redemption (Details)
 3 Months Ended
Mar. 31, 2019
5.0% Notes | Period One  
Debt Instrument, Redemption [Line Items]  
Redemption percentage of principal amount 102.50%
5.0% Notes | Period Two  
Debt Instrument, Redemption [Line Items]  
Redemption percentage of principal amount 101.667%
5.0% Notes | Period Three  
Debt Instrument, Redemption [Line Items]  
Redemption percentage of principal amount 100.833%
5.0% Notes | Period Four  
Debt Instrument, Redemption [Line Items]  
Redemption percentage of principal amount 100.00%
6.125% Notes | Period One  
Debt Instrument, Redemption [Line Items]  
Redemption percentage of principal amount 103.063%
6.125% Notes | Period Two  
Debt Instrument, Redemption [Line Items]  
Redemption percentage of principal amount 102.042%
6.125% Notes | Period Three  
Debt Instrument, Redemption [Line Items]  
Redemption percentage of principal amount 101.021%
6.125% Notes | Period Four  
Debt Instrument, Redemption [Line Items]  
Redemption percentage of principal amount 100.00%