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Commitments and Contingencies (Schedule of Provision for Contingencies) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Loss Contingency Accrual [Roll Forward]      
Balance at beginning of period $ 36,684 $ 26,078 $ 20,139
Accruals, net 35,999 28,577 37,729
Settlements (25,427) (20,554) (24,099)
Reclassifications and increase of judicial deposits (650) (37) (580)
Translation (575) 2,620 (7,111)
Balance at end of period 46,031 36,684 26,078
Judicial Deposits [Roll Forward]      
Judicial deposits, beginning of period (18,572) (5,500) (7,935)
Judicial deposits, accruals 161 0 0
Judicial deposits, settlements 0 0 684
Judicial deposits, reclassifications (60) (11,458) (863)
Judicial deposits, translation 396 (1,614) 2,614
Judicial deposits, end of period (18,075) (18,572) (5,500)
Loss Contingency Accrual, Net of Deposits [Roll Forward]      
Balance at beginning of period 18,112 20,578 12,204
Accruals, net 36,160 28,577 37,729
Settlements (25,427) (20,554) (23,415)
Reclassifications and increase of judicial deposits (710) (11,495) (1,443)
Translation (179) 1,006 (4,497)
Balance at end of period 27,956 18,112 20,578
Tax Contingencies in Brazil [Member]      
Loss Contingency Accrual [Roll Forward]      
Balance at beginning of period 13,312 5,118 1,999
Accruals, net (2,599) 7,196 4,616
Settlements (337) 0 (9)
Reclassifications and increase of judicial deposits (667) 0 (532)
Translation (385) 998 (956)
Balance at end of period 9,324 13,312 5,118
Labor Contingencies in Brazil [Member]      
Loss Contingency Accrual [Roll Forward]      
Balance at beginning of period 11,150 7,013 10,360
Accruals, net 31,448 19,903 19,692
Settlements (21,130) (17,523) (19,877)
Reclassifications and increase of judicial deposits 0 0 (26)
Translation (407) 1,757 (3,136)
Balance at end of period 21,061 11,150 7,013
Other [Member]      
Loss Contingency Accrual [Roll Forward]      
Balance at beginning of period 12,222 13,947 7,780
Accruals, net 7,150 1,478 13,421
Settlements (3,960) (3,031) (4,213)
Reclassifications and increase of judicial deposits 17 (37) (22)
Translation 217 (135) (3,019)
Balance at end of period $ 15,646 $ 12,222 $ 13,947