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Options and Awards Sale of Stock by Subsidiary (Details) - USD ($)
shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Subsidiary, Sale of Stock [Line Items]      
Payments for Repurchase of Common Stock $ 1,972 $ 7,288 $ 30,000
Proceeds from sale of subsidiary shares (Note 15) $ 1,972 $ 0 $ 0
Subsidiaries [Member] | Subsidiaries Stock awards [Member]      
Subsidiary, Sale of Stock [Line Items]      
Stock Repurchased During Period, Shares 865    
Payments for Repurchase of Common Stock $ 1,972    
Proceeds from sale of subsidiary shares (Note 15) $ 1,972