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Basis of Presentation (Narrative) (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
segment
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Number of reportable segments | segment   4    
Distributed earnings from unconsolidated subsidiaries   $ 4,595 $ 12,894  
Changes in fair value of investments previously reported as cost method investments $ 3,600 5,900    
Retained Earnings        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Reclassification from AOCI to retained earnings for stranded tax effects   (3,400)    
Accumulated Other Comprehensive Income (Loss)        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Reclassification from AOCI to retained earnings for stranded tax effects   $ 3,400    
Accounting Standards Update 2016-15        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Distributions from unconsolidated subsidiaries, investing activities     (12,900)  
Distributed earnings from unconsolidated subsidiaries     $ 12,900  
Accounting Standards Update 2016-01        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cumulative-effect adjustment adoption of ASU [1]       $ 8,334
Accounting Standards Update 2016-01 | Retained Earnings        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cumulative-effect adjustment adoption of ASU [1]       $ 8,334
[1] See Note 1 for discussion of accounting guidance adopted during the period.