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Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent     21.00% 35.00%
Accumulated other comprehensive loss $ 190,854 $ 14,618 $ 174,950 $ 70,476
Pretax income (loss) 5,698 43,305    
Income tax effect (3,654) 1,111    
Reclassification of unrealized loss (gain) (18,935) 8,747    
Reclassification of deferred income taxes 4,450 (2,045)    
Other comprehensive income from unconsolidated subsidiaries (3,463) (605)    
Adoption of ASU 2018-02 (see Note 8)   5,345    
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive loss 187,492 20,589 177,597 71,933
Pretax income (loss) (9,895) 48,435    
Income tax effect 0 50    
Reclassification of unrealized loss (gain) 0 0    
Reclassification of deferred income taxes 0 0    
Other comprehensive income from unconsolidated subsidiaries 0 0    
Adoption of ASU 2018-02 (see Note 8)   2,859    
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive loss (11,637) (17,278) (14,374) (11,538)
Pretax income (loss) 15,593 (4,501)    
Income tax effect (3,654) 1,053    
Reclassification of unrealized loss (gain) (19,188) 8,747    
Reclassification of deferred income taxes 4,512 (2,045)    
Other comprehensive income from unconsolidated subsidiaries 0 0    
Adoption of ASU 2018-02 (see Note 8)   2,486    
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive loss 7,884 9,393 8,075 8,772
Pretax income (loss) 0 (629)    
Income tax effect 0 8    
Reclassification of unrealized loss (gain) 253 0    
Reclassification of deferred income taxes (62) 0    
Other comprehensive income from unconsolidated subsidiaries 0 0    
Adoption of ASU 2018-02 (see Note 8)   0    
Accumulated Gain (Loss) from Unconsoldated Subsidiaries [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive loss 7,115 1,914 $ 3,652 $ 1,309
Pretax income (loss) 0 0    
Income tax effect 0 0    
Reclassification of unrealized loss (gain) 0 0    
Reclassification of deferred income taxes 0 0    
Other comprehensive income from unconsolidated subsidiaries (3,463) (605)    
Adoption of ASU 2018-02 (see Note 8)   0    
Cross Currency Fx Forward Contract [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax 4,000 1,000    
Interest Rate Swap [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax   $ 2,000    
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax $ 2,000