Supplemental Quarterly Information (Unaudited) - (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Significant items for the results of operations on a quarterly basis
Revenues from continuing operations	$ 1,018,169	$ 584,372	$ 560,643	$ 478,209	$ 519,761	$ 596,324	$ 578,900	$ 688,002	$ 2,641,393	$ 2,382,987	$ 2,154,655
Gross profit (loss) from continuing operations	545,557	24,076	(26,772)	(12,792)	61,863	51,159	57,514	249,455	530,069	419,991	84,354
Selling, general, and administrative expenses including research and development expense	41,052	24,762	27,041	25,354	27,579	21,933	24,539	32,688	118,209	106,739	95,843
Impairment of property, plant and equipment	595	11,145	468	0	879	0	0	0	12,208	879	49,873
Income (loss) from operations	503,910	(11,831)	(54,281)	(38,146)	33,405	29,226	32,975	216,767	399,652	312,373	(61,362)
Other expense, net	(825)	(2,551)	(3,444)	(3,671)	250	(2,900)	(96)	(128)	(10,491)	(2,874)	(35,407)
Net income (loss) from continuing operations	502,506	(13,753)	(57,635)	(41,387)	31,270	25,472	29,042	217,844	389,731	303,628	(66,279)
Net income (loss) from discontinued operations	(995)	(2,193)	(4,462)	(2,017)	(12,196)	(469)	4,808	(3,455)	(9,667)	(11,312)	(12,800)
Net income (loss)	501,511	(15,946)	(62,097)	(43,404)	19,074	25,003	33,850	214,389	380,064	292,316	(79,079)
Net income (loss) from continuing operations available to common stockholders	492,556	(13,753)	(57,635)	(41,387)	30,448	24,799	28,277	212,608	381,112	295,804	(66,279)
Net income (loss) from discontinued operations available to common stockholders	$ (995)	$ (2,193)	$ (4,462)	$ (2,017)	$ (12,197)	$ (469)	$ 4,681	$ (3,455)	$ (9,667)	$ (11,312)	$ (12,800)
Basic net income (loss) per share available to common stockholders
Continuing operations (in dollars per share)	$ 12.64	$ (0.35)	$ (1.52)	$ (1.11)	$ 0.82	$ 0.67	$ 0.76	$ 5.48	$ 9.95	$ 7.85	$ (1.71)
Discontinued operations (in dollars per share)	(0.03)	(0.06)	(0.12)	(0.05)	(0.33)	(0.01)	0.13	(0.09)	(0.25)	(0.30)	(0.33)
Net income (loss) per share (in dollars per share)	12.62	(0.41)	(1.64)	(1.16)	0.50	0.65	0.88	5.39	9.71	7.56	(2.04)
Diluted net income (loss) per share available to common stockholders
Continuing operations (in dollars per share)	11.52	(0.35)	(1.52)	(1.11)	0.66	0.55	0.67	5.38	9.01	6.78	(1.71)
Discontinued operations (in dollars per share)	(0.03)	(0.06)	(0.12)	(0.05)	(0.33)	(0.01)	0.11	(0.09)	(0.25)	(0.30)	(0.33)
Net income (loss) per share (in dollars per share)	$ 11.50	$ (0.41)	$ (1.64)	$ (1.16)	$ 0.40	$ 0.53	$ 0.78	$ 5.30	$ 8.78	$ 6.52	$ (2.04)