Consolidated Statement Of Shareholder's Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Earnings [Member]	Non-controlling Interests [Member]	Total
Beginning balance at Dec. 31, 2018	$ 744	$ 270,369	$ 158,641	$ 45,611	$ 475,365
Beginning balance, shares at Dec. 31, 2018	74,445,923
Net income			15,153	1,716	16,869
Dividends to shareholders			(12,655)		(12,655)
Ending balance at Mar. 31, 2019	$ 744	270,369	161,139	47,327	479,579
Ending balance, shares at Mar. 31, 2019	74,445,923
Beginning balance at Dec. 31, 2018	$ 744	270,369	158,641	45,611	475,365
Beginning balance, shares at Dec. 31, 2018	74,445,923
Net income					33,392
Ending balance at Sep. 30, 2019	$ 744	270,369	144,971	54,706	470,790
Ending balance, shares at Sep. 30, 2019	74,445,923
Beginning balance at Mar. 31, 2019	$ 744	270,369	161,139	47,327	479,579
Beginning balance, shares at Mar. 31, 2019	74,445,923
Net income			(11,183)	5,131	(6,052)
Dividends to shareholders			(12,657)		(12,657)
Ending balance at Jun. 30, 2019	$ 744	270,369	137,299	52,458	460,870
Ending balance, shares at Jun. 30, 2019	74,445,923
Net income			20,327	2,248	22,575
Dividends to shareholders			(12,655)		(12,655)
Ending balance at Sep. 30, 2019	$ 744	270,369	144,971	54,706	470,790
Ending balance, shares at Sep. 30, 2019	74,445,923
Beginning balance at Dec. 31, 2019	$ 744	269,534	145,847	49,534	465,659
Beginning balance, shares at Dec. 31, 2019	74,362,693
Net income			201	736	937
Dividends to shareholders			(9,667)		(9,667)
Stock repurchase, value	$ (19)	(11,722)			(11,741)
Stock repurchase, shares	(1,878,400)
Ending balance at Mar. 31, 2020	$ 725	257,812	136,381	50,270	445,188
Ending balance, shares at Mar. 31, 2020	72,484,293
Beginning balance at Dec. 31, 2019	$ 744	269,534	145,847	49,534	465,659
Beginning balance, shares at Dec. 31, 2019	74,362,693
Net income					5,293
Ending balance at Sep. 30, 2020	$ 725	257,812	51,196	53,555	363,288
Ending balance, shares at Sep. 30, 2020	72,484,293
Beginning balance at Mar. 31, 2020	$ 725	257,812	136,381	50,270	445,188
Beginning balance, shares at Mar. 31, 2020	72,484,293
Net income			(8,830)	641	(8,189)
Ending balance at Jun. 30, 2020	$ 725	257,812	127,551	50,911	436,999
Ending balance, shares at Jun. 30, 2020	72,484,293
Net income			9,901	2,644	12,545
Dividends to shareholders			(86,256)		(86,256)
Ending balance at Sep. 30, 2020	$ 725	$ 257,812	$ 51,196	$ 53,555	$ 363,288
Ending balance, shares at Sep. 30, 2020	72,484,293