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Supplemental Disclosure of Statement of Cash Flow Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other Significant Noncash Transactions [Line Items]      
Interest paid $ 75,069 $ 87,692 $ 88,725
Income taxes paid, net 2,340 1,240 741
Interests Sold [Member]      
Other Significant Noncash Transactions [Line Items]      
Loans assumed   242,269 55,000
Conveyed Interest [Member]      
Other Significant Noncash Transactions [Line Items]      
Mortgage loans on real estate, foreclosures 12,616 21,582 47,528
LCIF [Member]      
Other Significant Noncash Transactions [Line Items]      
Interest paid 15,846 27,262 28,191
Income taxes paid, net $ 119 34 $ 60
Mortgage loan related to property sales   $ 242,269