CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Stock Issued	Common Stock Treasury	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Noncontrolling Interests
Beginning balance at Dec. 31, 2020	$ 713,399	$ 144,288	$ (843,230)	$ 204,078	$ 1,797,759	$ (645,741)	$ 56,245
Increase (Decrease) in Stockholders' Equity
Net income (loss)	1,565				135		1,430
Total other comprehensive income	1,229					2,295	(1,066)
Stock appreciation rights exercised, net	(70)	9	(70)	(9)
Vesting of restricted stock units and other stock grants, net	(1,850)	312	(1,850)	(312)
Vesting of performance share units, net	(1,032)	155	(1,032)	(155)
Amortization of unearned portion of stock-based compensation, net of forfeitures	3,342			3,342
Ending balance at Mar. 31, 2021	716,583	144,764	(846,182)	206,944	1,797,894	(643,446)	56,609
Beginning balance at Dec. 31, 2020	713,399	144,288	(843,230)	204,078	1,797,759	(645,741)	56,245
Increase (Decrease) in Stockholders' Equity
Net income (loss)	16,645
Total other comprehensive income	19,142
Ending balance at Jun. 30, 2021	749,383	144,836	(846,401)	209,992	1,811,282	(626,206)	55,880
Beginning balance at Mar. 31, 2021	716,583	144,764	(846,182)	206,944	1,797,894	(643,446)	56,609
Increase (Decrease) in Stockholders' Equity
Net income (loss)	15,080				13,388		1,692
Noncontrolling interests	(3,094)						(3,094)
Total other comprehensive income	17,913					17,240	673
Stock appreciation rights exercised, net	(219)	28	(219)	(28)
Vesting of performance share units, net	0	44		(44)
Amortization of unearned portion of stock-based compensation, net of forfeitures	3,120			3,120
Ending balance at Jun. 30, 2021	749,383	144,836	(846,401)	209,992	1,811,282	(626,206)	55,880
Beginning balance at Dec. 31, 2021	805,770	144,883	(846,622)	215,528	1,794,510	(560,139)	57,610
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(38,680)				(39,839)		1,159
Total other comprehensive income	12,008					12,490	(482)
Vesting of restricted stock units and other stock grants, net	(1,632)	378	(1,632)	(378)
Amortization of unearned portion of stock-based compensation, net of forfeitures	3,629			3,629
Ending balance at Mar. 31, 2022	781,095	145,261	(848,254)	218,779	1,754,671	(547,649)	58,287
Beginning balance at Dec. 31, 2021	805,770	144,883	(846,622)	215,528	1,794,510	(560,139)	57,610
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(143,176)
Total other comprehensive income	(17,118)
Ending balance at Jun. 30, 2022	651,703	145,319	(848,320)	221,117	1,649,080	(573,872)	58,379
Beginning balance at Mar. 31, 2022	781,095	145,261	(848,254)	218,779	1,754,671	(547,649)	58,287
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(104,496)				(105,591)		1,095
Total other comprehensive income	(29,126)					(26,223)	(2,903)
Contributions from noncontrolling interests	1,900						1,900
Stock appreciation rights exercised, net	(66)	29	(66)	(29)
Vesting of restricted stock units and other stock grants, net	0	29		(29)
Amortization of unearned portion of stock-based compensation, net of forfeitures	2,396			2,396
Ending balance at Jun. 30, 2022	$ 651,703	$ 145,319	$ (848,320)	$ 221,117	$ 1,649,080	$ (573,872)	$ 58,379