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Segment Information (Sales) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Segment Reporting Information [Line Items] |  |
Net external sales | $ 1,942,616 | $ 975,187
Income (loss) from operations | 235,298 | 202,276
Depreciation and amortization | 150,269 | 65,714
Other income (expense), net | 5,071 | 2,645
Provision for (benefit from) income taxes | 55,883 | 69,300
Capital expenditures | 134,285 | 136,328
Operating Segments [Member] |  |
Segment Reporting Information [Line Items] |  |
Net external sales | 1,942,616 | 975,187
Operating Segments [Member] | Olefins [Member] |  |
Segment Reporting Information [Line Items] |  |
Net external sales | 542,995 | 431,020
Income (loss) from operations | 179,817 | 149,235
Depreciation and amortization | 41,040 | 28,697
Other income (expense), net | 1,370 | 1,513
Provision for (benefit from) income taxes | 57,811 | 52,533
Capital expenditures | 25,350 | 95,152
Operating Segments [Member] | Vinyls [Member] |  |
Segment Reporting Information [Line Items] |  |
Net external sales | 1,399,621 | 544,167
Income (loss) from operations | 71,441 | 62,116
Depreciation and amortization | 107,273 | 36,287
Other income (expense), net | 3,878 | (1,519)
Provision for (benefit from) income taxes | 14,958 | 17,270
Capital expenditures | 108,081 | 40,256
Operating Segments [Member] | Polyethylene [Member] | Olefins [Member] |  |
Segment Reporting Information [Line Items] |  |
Net external sales | 385,942 | 346,032
Operating Segments [Member] | Styrene, Feedstock And Other [Member] | Olefins [Member] |  |
Segment Reporting Information [Line Items] |  |
Net external sales | 157,053 | 84,988
Operating Segments [Member] | PVC, Caustic Soda And Other [Member] | Vinyls [Member] |  |
Segment Reporting Information [Line Items] |  |
Net external sales | 1,131,129 | 430,902
Operating Segments [Member] | Building Products [Member] | Vinyls [Member] |  |
Segment Reporting Information [Line Items] |  |
Net external sales | 268,492 | 113,265
Corporate and other [Member] |  |
Segment Reporting Information [Line Items] |  |
Income (loss) from operations | (15,960) | (9,075)
Depreciation and amortization | 1,956 | 730
Other income (expense), net | (177) | 2,651
Provision for (benefit from) income taxes | (16,886) | (503)
Capital expenditures | 854 | 920
Intersegment sales [Member] |  |
Segment Reporting Information [Line Items] |  |
Net external sales | 86,236 | 28,313
Intersegment sales [Member] | Olefins [Member] |  |
Segment Reporting Information [Line Items] |  |
Net external sales | 85,944 | 27,949
Intersegment sales [Member] | Vinyls [Member] |  |
Segment Reporting Information [Line Items] |  |
Net external sales | $ 292 | $ 364

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