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Other Investments (Summarized financial information) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Investments, All Other Investments [Abstract]      
Total assets $ 2,493,798 $ 2,803,411  
Total liabilities 1,169,125 683,079  
Noncontrolling interests 13,258 23,544  
Total equity 1,311,415 2,096,788  
Revenues 261,867 272,281 $ 481,224
Expenses (167,999) (227,720) (245,968)
Net income attributable to parent entities $ 91,633 $ 42,209 $ 234,529