CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total	Common Stock at Par Value	Capital in Excess of Par Value	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests
Effect of new accounting principles	$ 0	$ 0	$ 0	$ 0	$ 22,354	$ (22,354)	$ 0
Balance at Dec. 31, 2017	4,997,940	125,424	1,114,167	(1,762,239)	5,596,786	(124,883)	48,685
Consolidated net income (loss)	721,574	0	0	0	716,195	0	5,379
Other comprehensive income (loss)	(154,743)	0	0	0	0	(152,212)	(2,531)
Amortization of stock-based compensation	46,238	0	46,238	0	0	0	0
Shares issued for stock-based compensation awards	8,819	0	(24,471)	33,290	0	0	0
Repurchases of common stock	(243,305)	0	0	(243,305)	0	0	0
Distributions	(157)	0	0	0	0	0	(157)
Balance at Dec. 31, 2018	5,376,366	125,424	1,135,934	(1,972,254)	6,335,335	(299,449)	51,376
Consolidated net income (loss)	(200,168)	0	0	0	(204,087)	0	3,919
Other comprehensive income (loss)	36,564	0	0	0	0	37,238	(674)
Amortization of stock-based compensation	41,070	0	41,070	0	0	0	0
Shares issued for stock-based compensation awards	16,911	0	(26,998)	43,909	0	0	0
Repurchases of common stock	(404,203)	0	0	(404,203)	0	0	0
Distributions	(147)	0	0	0	0	0	(147)
Balance at Dec. 31, 2019	4,866,393	125,424	1,150,006	(2,332,548)	6,131,248	(262,211)	54,474
Effect of new accounting principles	(35,935)	0	0	0	(35,935)	0	0
Consolidated net income (loss)	586,464	0	0	0	584,438	0	2,026
Other comprehensive income (loss)	160,600	0	0	0	0	157,326	3,274
Amortization of stock-based compensation	35,288	0	35,288	0	0	0	0
Shares issued for stock-based compensation awards	21,037	0	(19,444)	40,481	0	0	0
Repurchases of common stock	(484,754)	0	0	(484,754)	0	0	0
Distributions	(141)	0	0	0	0	0	(141)
Balance at Dec. 31, 2020	$ 5,148,952	$ 125,424	$ 1,165,850	$ (2,776,821)	$ 6,679,751	$ (104,885)	$ 59,633