Investments in Non-Consolidated Affiliates (Unaudited) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Noncontrolling Interest [Line Items]
Assets, Current	$ 272,736				$ 266,791				$ 272,736	$ 266,791
NET EARNINGS									32,115	61,202	$ 69,285
Liabilities, Current	301,988				263,239				301,988	263,239
Liabilities	2,146,248				2,359,836				2,146,248	2,359,836
REVENUES	399,358	$ 404,146	$ 377,794	$ 389,277	403,351	$ 366,073	$ 334,576	$ 348,183	1,570,575	1,452,183	892,345
Noncontrolling Interest [Member]
Noncontrolling Interest [Line Items]
Assets, Current	10,154				64,392				10,154	64,392
Total Expenses									(19,166)	(143,775)	(228,169)
NET EARNINGS									(19,033)	(29,510)	(26,141)
Long-Lived Assets	495				213,940				495	213,940
Liabilities, Current	(1,127)				(155,451)				(1,127)	(155,451)
Liabilities	0				(123,837)				0	(123,837)
Stockholders' Equity Attributable to Noncontrolling Interest	$ (9,522)				$ 956				(9,522)	956
REVENUES									$ 133	$ 114,265	$ 202,028