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Other Assets and Other Liabilities (Schedule of Other Liabilities) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other Significant Noncash Transactions [Line Items]      
Accrued expenses $ 101,035 $ 72,693  
Other liabilities 79,015 75,993  
Accrued interest payable 49,933 54,033  
Intangible liabilities, net 8,021 8,851  
Accounts payable, accrued expenses and other liabilities 238,004 211,570  
Profit sharing payable 29,200 24,000  
Special assessment bond 6,200 8,500  
Below market lease, accumulated amortization 7,800 6,400  
Amortization of below market lease $ 1,300 1,100 $ 1,500
Weighted average useful life 19 years 2 months 12 days    
Assets Held-for-Sale      
Other Significant Noncash Transactions [Line Items]      
Accrued expenses $ 2,500 1,800  
Other liabilities $ 1,600 $ 1,700