v3.8.0.1
Schedule I, Condensed Financial Statements, of financial position (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Jun. 18, 2014
Assets [Abstract]          
Cash and cash equivalents $ 669,387 $ 594,811 $ 514,712 $ 354,154  
Total assets 10,492,339 10,297,799      
Liabilities and Equity [Abstract]          
Total liabilities 8,596,886 8,338,688      
Common Stock 10,022 10,022     $ 2,485
Distributable reserves (477,214) (365,410)      
Total equity 1,895,453 1,959,111 2,023,501 1,839,631  
Total equity and liabilities 10,492,339 10,297,799      
Parent Company [Member]          
Assets [Abstract]          
Investment in affiliates 2,044,967 2,035,598      
Loans to affiliates 647,911 704,916      
Cash and cash equivalents 148,525 122,154 45,487 $ 155,367  
Other assets 3,704 23,936      
Total assets 2,845,107 2,886,604      
Liabilities and Equity [Abstract]          
Borrowings 386,616 412,839      
Notes and bonds 256,468 255,362      
Intercompany liabilities 103,796 54,687      
Other liabilities 11,168 10,296      
Total liabilities 758,048 733,184      
Common Stock 10,022 10,022      
Additional paid-in capital 1,981,881 1,981,881      
Distributable reserves 42,410 116,375      
Other reserves 181 13,879      
Accumulated gains (losses)-net 52,565 31,263      
Total equity 2,087,059 2,153,420 $ 2,158,021    
Total equity and liabilities $ 2,845,107 $ 2,886,604