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Long-Term Debt (Tables)
 9 Months Ended
Sep. 30, 2016
Debt Disclosure [Abstract]  
Schedule Of Long-Term Debt
Long-term debt consists of the following:
 
 
September 30, 2016
 
December 31, 2015
 
 
Principal
Amount
 
Unamortized
Premium,
Discount
and Debt
Issuance
Costs (1)
 
Net
Long-term
Debt
 
Principal
Amount
 
Unamortized
Discount
and Debt
Issuance
Costs  (1)
 
Net
Long-term
Debt
Revolving credit facility
 
$
325,000

 
$
—

 
$
325,000

 
$
—

 
$
—

 
$
—

4.625% senior notes due 2021 (the
   "4.625% Westlake 2021 Senior Notes")
 
624,793

 
28,463

 
653,256

 
—

 
—

 
—

4.625% senior notes due 2021
   (the "4.625% Subsidiary 2021 Senior
   Notes")
 
63,207

 
3,036

 
66,243

 
—

 
—

 
—

3.60% senior notes due 2022
 
250,000

 
(1,976
)
 
248,024

 
250,000

 
(2,232
)
 
247,768

4.875% senior notes due 2023 (the
   "4.875% Westlake 2023 Senior Notes")
 
433,793

 
13,958

 
447,751

 
—

 
—

 
—

4.875% senior notes due 2023
   (the "4.875% Subsidiary 2023 Senior
   Notes")
 
16,207

 
562

 
16,769

 
—

 
—

 
—

3.60% senior notes due 2026
   (the "3.60% 2026 Senior Notes")
 
750,000

 
(10,918
)
 
739,082

 
—

 
—

 
—

Loan related to tax-exempt waste
   disposal revenue bonds due 2027
 
10,889

 
—

 
10,889

 
10,889

 
—

 
10,889

6 ½% senior notes due 2029
 
100,000

 
(934
)
 
99,066

 
100,000

 
(989
)
 
99,011

6 ¾% senior notes due 2032
 
250,000

 
(1,913
)
 
248,087

 
250,000

 
(2,002
)
 
247,998

6 ½% senior notes due 2035 (the "6 ½%
   2035 GO Zone Senior Notes")
 
89,000

 
(851
)
 
88,149

 
89,000

 
(884
)
 
88,116

6 ½% senior notes due 2035 (the "6 ½%
   2035 IKE Zone Senior Notes")
 
65,000

 
(610
)
 
64,390

 
65,000

 
(634
)
 
64,366

5.0% senior notes due 2046 (the "5.0%
   2046 Senior Notes")
 
700,000

 
(26,121
)
 
673,879

 
—

 
—

 
—

Long-term debt, net
 
$
3,677,889

 
$
2,696

 
$
3,680,585

 
$
764,889

 
$
(6,741
)
 
$
758,148

_____________
(1)
Includes unamortized debt issuance costs of $21,286 and $5,967 at September 30, 2016 and December 31, 2015, respectively.