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Components Of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Jan. 01, 2019
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income [Roll Forward]            
Accumulated other comprehensive income (loss) $ (1,034)     $ 14,563    
Change in derivative instruments designated as cash flow hedges, net of income tax effect of ($2,144) and $3,354 (14,323) $ 12,459        
Reclassification of (gain) loss on derivative instruments designated as cash flow hedges, net of income tax effect of ($606) and ($352) (1,749) (1,472)        
Foreign currency translation adjustment 43 92        
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]            
Accumulated Other Comprehensive Income [Roll Forward]            
Accumulated other comprehensive income (loss) 3,403 39,173   19,043   $ 31,215
Change in derivative instruments designated as cash flow hedges, net of income tax effect of ($2,144) and $3,354 (14,323) 12,459        
Reclassification of (gain) loss on derivative instruments designated as cash flow hedges, net of income tax effect of ($606) and ($352) (1,749) (1,472)        
Foreign currency translation adjustment 0 0        
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax (15,640) 7,958        
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]            
Accumulated Other Comprehensive Income [Roll Forward]            
Accumulated other comprehensive income (loss) (4,437) (4,181)   (4,480)   (4,273)
Change in derivative instruments designated as cash flow hedges, net of income tax effect of ($2,144) and $3,354 0 0        
Reclassification of (gain) loss on derivative instruments designated as cash flow hedges, net of income tax effect of ($606) and ($352) 0 0        
Foreign currency translation adjustment 43 92        
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax 43 92        
AOCI Attributable to Parent [Member]            
Accumulated Other Comprehensive Income [Roll Forward]            
Accumulated other comprehensive income (loss) (1,034) 34,992   $ 14,563   $ 26,942
Change in derivative instruments designated as cash flow hedges, net of income tax effect of ($2,144) and $3,354 (14,323) 12,459        
Reclassification of (gain) loss on derivative instruments designated as cash flow hedges, net of income tax effect of ($606) and ($352) (1,749) (1,472)        
Foreign currency translation adjustment 43 92        
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax $ (15,597) $ 8,050        
Accounting Standards Update 2018-02 [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]            
Accumulated Other Comprehensive Income [Roll Forward]            
Cumulative effect in period of adoption         $ (3,029)  
Accounting Standards Update 2018-02 [Member] | Accumulated Foreign Currency Adjustment Attributable to Parent [Member]            
Accumulated Other Comprehensive Income [Roll Forward]            
Cumulative effect in period of adoption         0  
Accounting Standards Update 2018-02 [Member] | AOCI Attributable to Parent [Member]            
Accumulated Other Comprehensive Income [Roll Forward]            
Cumulative effect in period of adoption         $ (3,029)  
Accounting Standards Update 2017-12 [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]            
Accumulated Other Comprehensive Income [Roll Forward]            
Cumulative effect in period of adoption     $ 432      
Accounting Standards Update 2017-12 [Member] | Accumulated Foreign Currency Adjustment Attributable to Parent [Member]            
Accumulated Other Comprehensive Income [Roll Forward]            
Cumulative effect in period of adoption     0      
Accounting Standards Update 2017-12 [Member] | AOCI Attributable to Parent [Member]            
Accumulated Other Comprehensive Income [Roll Forward]            
Cumulative effect in period of adoption     $ 432