Condensed Consolidated Statements of Equity (Unaudited) - USD ($) $ in Thousands	Cumulative Effect, Period of Adoption, Adjustment [Member] Common Stock [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Additional Paid-in Capital [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Retained Earnings [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] AOCI Attributable to Parent [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Noncontrolling Interest [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Noncontrolling Interest [Member]	Total
Balance at Dec. 31, 2019	$ 0	$ 0	$ (163)	$ 0	$ 0	$ (163)	$ 40	$ 1,367,521	$ (352,526)	$ (236)	$ 1,611	$ 1,016,410
Total comprehensive income (loss)							0	0	(166,995)	1,342	(274)	(165,927)
Amortization of share-based awards							0	3,257	0	0	0	3,257
Balance at Sep. 30, 2020							40	1,370,778	(519,684)	1,106	1,337	853,577
Balance at Jun. 30, 2020							40	1,369,645	(481,757)	581	1,491	890,000
Total comprehensive income (loss)							0	0	(37,927)	525	(154)	(37,556)
Amortization of share-based awards							0	1,133	0	0	0	1,133
Balance at Sep. 30, 2020							40	1,370,778	(519,684)	1,106	1,337	853,577
Balance at Dec. 31, 2020							41	1,371,809	(548,931)	(804)	1,157	823,272
Total comprehensive income (loss)							0	0	(91,035)	(485)	(546)	(92,066)
Amortization of share-based awards							0	3,406	0	0	0	3,406
Balance at Sep. 30, 2021							41	1,375,215	(639,966)	(1,289)	611	734,612
Balance at Jun. 30, 2021							41	1,373,727	(613,708)	(1,082)	760	759,738
Total comprehensive income (loss)							0	0	(26,258)	(207)	(149)	(26,614)
Amortization of share-based awards							0	1,488	0	0	0	1,488
Balance at Sep. 30, 2021							$ 41	$ 1,375,215	$ (639,966)	$ (1,289)	$ 611	$ 734,612