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Other Investments (Summarized financial information) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Investments, All Other Investments [Abstract]      
Total assets $ 2,803,411 $ 3,597,587  
Total liabilities 683,079 768,622  
Noncontrolling interests 23,544 19,208  
Total equity 2,096,788 2,809,757  
Revenues 272,281 481,224 $ 626,039
Expenses (227,720) (245,968) (185,603)
Net income attributable to parent entities $ 42,209 $ 234,529 $ 440,210