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Derivative and Hedging Activities (Interest Rate Derivatives Designated as Cash Flow Hedges) (Details)
₩ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2016
KRW (₩)
Dec. 31, 2015
USD ($)
Derivative [Line Items]        
Derivative Asset, Fair Value, Gross Asset $ 381     $ 0
Interest Rate Cash Flow Hedges [Abstract]        
Noncontrolling Interest, Ownership Percentage by Parent 71.00% 72.00% 71.00% 71.00%
Debt Instrument, Description of Variable Rate Basis LIBOR      
Consolidated Subsidiaries Interest Rate Swap 1 [Domain]        
Interest Rate Cash Flow Hedges [Abstract]        
Noncontrolling Interest, Ownership Percentage by Parent 100.00%   100.00%  
Notional amount $ 200,000      
Derivative, Fixed Interest Rate 1.64%   1.64%  
Derivative, Basis Spread on Variable Rate 1.45%   1.45%  
Total Swapped Rate On Loan 3.09%   3.09%  
Derivative, Maturity Date Feb. 01, 2019      
Unsecured Debt $ 475,000      
Derivative, Lower Range of Basis Spread, Variable Rate 1.35%   1.35%  
Derivative, Higher Range of Basis Spread, Variable Rate 1.90%   1.90%  
Consolidated Subsidiaries Interest Rate Swap 1 [Domain] | London Interbank Offered Rate (LIBOR) [Member]        
Interest Rate Cash Flow Hedges [Abstract]        
Debt Instrument, Description of Variable Rate Basis one-month LIBOR      
Consolidated Subsidiaries Interest Rate Swap 2 [Domain]        
Interest Rate Cash Flow Hedges [Abstract]        
Noncontrolling Interest, Ownership Percentage by Parent 100.00%   100.00%  
Notional amount $ 175,000      
Derivative, Fixed Interest Rate 1.65%   1.65%  
Derivative, Basis Spread on Variable Rate 1.45%   1.45%  
Total Swapped Rate On Loan 3.10%   3.10%  
Derivative, Maturity Date Feb. 01, 2019      
Unsecured Debt $ 475,000      
Derivative, Lower Range of Basis Spread, Variable Rate 1.35%   1.35%  
Derivative, Higher Range of Basis Spread, Variable Rate 1.90%   1.90%  
Consolidated Subsidiaries Interest Rate Swap 2 [Domain] | London Interbank Offered Rate (LIBOR) [Member]        
Interest Rate Cash Flow Hedges [Abstract]        
Debt Instrument, Description of Variable Rate Basis one-month LIBOR      
Consolidated Subsidiaries Interest Rate Swap 3 [Domain]        
Interest Rate Cash Flow Hedges [Abstract]        
Noncontrolling Interest, Ownership Percentage by Parent 100.00%   100.00%  
Notional amount $ 100,000      
Derivative, Fixed Interest Rate 1.64%   1.64%  
Derivative, Basis Spread on Variable Rate 1.45%   1.45%  
Total Swapped Rate On Loan 3.09%   3.09%  
Derivative, Maturity Date Feb. 01, 2019      
Unsecured Debt $ 475,000      
Derivative, Lower Range of Basis Spread, Variable Rate 1.35%   1.35%  
Derivative, Higher Range of Basis Spread, Variable Rate 1.90%   1.90%  
Consolidated Subsidiaries Interest Rate Swap 3 [Domain] | London Interbank Offered Rate (LIBOR) [Member]        
Interest Rate Cash Flow Hedges [Abstract]        
Debt Instrument, Description of Variable Rate Basis one-month LIBOR      
Consolidated Subsidiaries Interest Rate Swap 4 [Domain]        
Interest Rate Cash Flow Hedges [Abstract]        
Noncontrolling Interest, Ownership Percentage by Parent 100.00%   100.00%  
Notional amount $ 12,000      
Derivative, Fixed Interest Rate 2.09%   2.09%  
Derivative, Basis Spread on Variable Rate 1.40%   1.40%  
Total Swapped Rate On Loan 3.49%   3.49%  
Derivative, Maturity Date Mar. 01, 2024      
Unconsolidated Joint Ventures Interest Rate Swap 1 (Member)        
Interest Rate Cash Flow Hedges [Abstract]        
Noncontrolling Interest, Ownership Percentage by Parent 50.00%   50.00%  
Notional amount $ 132,534      
Derivative, Fixed Interest Rate 2.40%   2.40%  
Derivative, Basis Spread on Variable Rate 1.70%   1.70%  
Total Swapped Rate On Loan 4.10%   4.10%  
Derivative, Maturity Date Apr. 01, 2018      
Unconsolidated Joint Ventures Interest Rate Swap 2 (Member)        
Interest Rate Cash Flow Hedges [Abstract]        
Noncontrolling Interest, Ownership Percentage by Parent 50.00%   50.00%  
Notional amount $ 132,534      
Derivative, Fixed Interest Rate 2.40%   2.40%  
Derivative, Basis Spread on Variable Rate 1.70%   1.70%  
Total Swapped Rate On Loan 4.10%   4.10%  
Derivative, Maturity Date Apr. 01, 2018      
Unconsolidated Joint Ventures Interest Rate Swap3 [Member]        
Interest Rate Cash Flow Hedges [Abstract]        
Noncontrolling Interest, Ownership Percentage by Parent 50.10%   50.10%  
Notional amount $ 168,983      
Derivative, Fixed Interest Rate 1.83%   1.83%  
Derivative, Basis Spread on Variable Rate 1.75%   1.75%  
Total Swapped Rate On Loan 3.58%   3.58%  
Derivative, Maturity Date Dec. 01, 2021      
Unconsolidated Joint Ventures Interest Rate Swap 4 [Member]        
Interest Rate Cash Flow Hedges [Abstract]        
Noncontrolling Interest, Ownership Percentage by Parent 34.30%   34.30%  
Notional amount $ 52,065   ₩ 60,500,000  
Derivative, Fixed Interest Rate 1.52%   1.52%  
Derivative, Basis Spread on Variable Rate 1.60%   1.60%  
Total Swapped Rate On Loan 3.12%   3.12%  
Derivative, Maturity Date Sep. 01, 2020      
Swapped Foreign Currency Exchange Rate 1,162.0      
Equity Method Investments [Member] | Unconsolidated Properties [Member]        
Derivative [Line Items]        
Derivative Asset, Fair Value, Gross Asset      
Starwood Transaction [Member]        
Interest Rate Cash Flow Hedges [Abstract]        
Gain (Loss) on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net   $ 4,900    
Derivative, Loss on Derivative   $ 2,900