CONDENSED CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Common Stock [Member]	Retained Earnings/Accumulated Deficit [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Parent [Member]	Noncontrolling Interests [Member]	Total	Redeemable Noncontrolling Interests [Member]
Balance at Dec. 31, 2019	$ 25	$ (701)	$ 1,003,450	$ (106,342)	$ 896,432	$ 1,003	$ 897,435	$ 50,385
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Redemptions of noncontrolling interests	0	0	0	0	0	0	0	(531)
Net income/(loss)	0	(73,355)	0	0	(73,355)	(52)	(73,407)	(3,945)
Purchase of treasury stock	0	0	0	(3,225)	(3,225)	0	(3,225)	0
Balance at Mar. 31, 2020	25	(74,056)	1,003,450	(109,567)	819,852	951	820,803	45,909
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income/(loss)	0	35,237	0	0	35,237	(48)	35,189	(1,167)
Dividends declared ($0.10 per share)	0	(2,237)	0	0	(2,237)	0	(2,237)	2,436
Purchase of treasury stock	0	0	0	(1,068)	(1,068)	0	(1,068)	0
Balance at Jun. 30, 2020	25	(41,056)	1,003,450	(110,635)	851,784	903	852,687	47,178
Balance at Dec. 31, 2020	25	13,649	999,047	(113,783)	898,938	2,451	901,389	206,828
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Contributions from redeemable noncontrolling interests								136
Redemptions of noncontrolling interests	0	0	0	0	0	0	0	(12,066)
Net income/(loss)		18,555	0	0	18,555	0	18,555	172
Purchase of treasury stock	0	0	0	(4,198)	(4,198)	0	(4,198)	0
Balance at Mar. 31, 2021	25	32,204	999,047	(117,981)	913,295	2,451	915,746	195,070
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Contributions from redeemable noncontrolling interests								665
Net income/(loss)	0	29,716	0	0	29,716	0	29,716	(532)
Dividends declared ($0.10 per share)	0	(2,211)	0	0	(2,211)	0	(2,211)	0
Purchase of treasury stock	0	0	0	(1,893)	(1,893)	0	(1,893)	0
Accretion of redeemable noncontrolling interests to redemption value	0	0	(6,001)	0	(6,001)	(2,892)	(8,893)	8,893
Other changes to redeemable noncontrolling interests	0	0	0	0	0	0	0	(7,527)
Balance at Jun. 30, 2021	$ 25	$ 59,709	$ 993,046	$ (119,874)	$ 932,906	$ (441)	$ 932,465	$ 196,569