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14. Segment Information Segment Asset Reconciliation (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets $ 5,611,068 $ 4,273,012
Operating Segments [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets 1,405,100 1,496,200
Other Current Assets [Member] | Segment Reconciling Items [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets 1,047,200 965,800
Property, Plant and Equipment excluding segment specific [Member] | Segment Reconciling Items [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets 79,900 57,000
Goodwill [Member] | Segment Reconciling Items [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets 219,800 506,100
Other Noncurrent Assets [Member] | Segment Reconciling Items [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets $ 2,859,100 $ 1,247,900