Business Segment Information (Details 1) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Revenues	$ 2,995,443	$ 2,482,700	$ 2,750,109
Property and equipment, net of accumulated depreciation of $532,631 and $490,429	345,381	378,441
Total Assets	4,744,276	4,926,711	4,657,666
UNITED STATES
Segment Reporting Information [Line Items]
Revenues	805,028	725,135	716,576
Property and equipment, net of accumulated depreciation of $532,631 and $490,429	59,469	55,573
Total Assets	1,040,190	1,255,983
Non-US
Segment Reporting Information [Line Items]
Revenues	2,190,415	1,757,565	2,033,533
Property and equipment, net of accumulated depreciation of $532,631 and $490,429	285,912	322,868
Total Assets	3,704,086	3,670,728
GERMANY
Segment Reporting Information [Line Items]
Revenues	631,550	533,999	518,146
Property and equipment, net of accumulated depreciation of $532,631 and $490,429	32,126	38,808
Total Assets	901,724	797,627
SPAIN
Segment Reporting Information [Line Items]
Revenues	157,766	118,934	189,104
Property and equipment, net of accumulated depreciation of $532,631 and $490,429	50,321	61,563
Total Assets	317,199	291,254
UNITED KINGDOM
Segment Reporting Information [Line Items]
Revenues	143,914	118,024	135,006
Property and equipment, net of accumulated depreciation of $532,631 and $490,429	13,783	20,150
Total Assets	371,090	402,587
ITALY
Segment Reporting Information [Line Items]
Revenues	130,095	92,006	130,929
Property and equipment, net of accumulated depreciation of $532,631 and $490,429	18,279	21,225
Total Assets	207,347	231,548
POLAND
Segment Reporting Information [Line Items]
Revenues	93,654	89,688	130,104
Property and equipment, net of accumulated depreciation of $532,631 and $490,429	24,091	33,087
Total Assets	201,506	206,016
INDIA
Segment Reporting Information [Line Items]
Revenues	173,154	123,343	113,146
Property and equipment, net of accumulated depreciation of $532,631 and $490,429	32,705	26,126
Total Assets	206,378	182,073
FRANCE
Segment Reporting Information [Line Items]
Revenues	166,655	119,265	94,352
Property and equipment, net of accumulated depreciation of $532,631 and $490,429	7,038	2,731
Total Assets	134,981	112,335
GREECE
Segment Reporting Information [Line Items]
Revenues	61,627	39,705	79,716
Property and equipment, net of accumulated depreciation of $532,631 and $490,429	10,815	13,252
Total Assets	80,778	78,439
MALAYSIA
Segment Reporting Information [Line Items]
Revenues	50,039	73,541	74,948
Property and equipment, net of accumulated depreciation of $532,631 and $490,429	1,998	2,319
Total Assets	91,813	115,448
AUSTRALIA
Segment Reporting Information [Line Items]
Revenues	46,851	46,062	51,686
Property and equipment, net of accumulated depreciation of $532,631 and $490,429	2,791	1,575
Total Assets	56,275	68,577
NEW ZEALAND
Segment Reporting Information [Line Items]
Revenues	56,480	47,368	47,611
Property and equipment, net of accumulated depreciation of $532,631 and $490,429	3,949	3,772
Total Assets	231,468	254,580
Other countries [Member]
Segment Reporting Information [Line Items]
Revenues	478,630	355,630	$ 468,785
Property and equipment, net of accumulated depreciation of $532,631 and $490,429	88,016	98,260
Total Assets	$ 903,527	$ 930,244

Segment Reporting Information [Line Items]