CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands	Total	Common Stock Issued	Treasury	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests
Balances at Dec. 31, 2020	$ 713,399	$ 144,288	$ (843,230)	$ 204,078	$ 1,797,759	$ (645,741)	$ 56,245
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	2,729				(3,249)		5,978
Cash dividends declared:
Noncontrolling interests	(3,116)						(3,116)
Total other comprehensive income (loss)	84,105					85,602	(1,497)
Stock appreciation rights exercised	(376)	58	(376)	(58)
Vesting of restricted stock units and other stock grants	(1,983)	382	(1,983)	(382)
Vesting of performance share units	(1,033)	155	(1,033)	(155)
Amortization of unearned stock-based compensation, net of forfeitures	12,045			12,045
Balances at Dec. 31, 2021	805,770	144,883	(846,622)	215,528	1,794,510	(560,139)	57,610
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(176,431)				(180,069)		3,638
Cash dividends declared:
Noncontrolling interests	(4,841)						(4,841)
Total other comprehensive income (loss)	(11,607)					(7,497)	(4,110)
Proceeds from (Payments to) Noncontrolling Interests	1,901						1,901
Strategic venture exit	(598)						(598)
Stock appreciation rights exercised	(66)	29	(66)	(29)
Vesting of restricted stock units and other stock grants	(1,882)	536	(1,882)	(536)
Amortization of unearned stock-based compensation, net of forfeitures	10,796			10,796
Balances at Dec. 31, 2022	623,042	145,448	(848,570)	225,759	1,614,441	(567,636)	53,600
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(88,098)				(86,121)		(1,977)
Cash dividends declared:
Noncontrolling interests	(5)						(5)
Total other comprehensive income (loss)	27,325					27,942	(617)
Purchase of subsidiary shares from noncontrolling interest	0			398			(398)
Proceeds from (Payments to) Noncontrolling Interests	1,654						1,654
Vesting of restricted stock units and other stock grants	(1,426)	657	(1,426)	(657)
Amortization of unearned stock-based compensation, net of forfeitures	12,916			12,916
Balances at Dec. 31, 2023	$ 575,408	$ 146,105	$ (849,996)	$ 238,416	$ 1,528,320	$ (539,694)	$ 52,257