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Derivative and Hedging Activities (Interest Rate Derivatives) (Details)
₩ in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
Mar. 31, 2020
KRW (₩)
Dec. 31, 2019
USD ($)
Derivative [Line Items]      
Derivative Liability, Fair Value, Gross Liability $ 32,940   $ 15,922
Cash flow hedges of interest rate risk [Abstract]      
Noncontrolling Interest, Ownership Percentage by Parent 70.00% 70.00%  
London Interbank Offered Rate (LIBOR) [Member]      
Cash flow hedges of interest rate risk [Abstract]      
Debt Instrument, Description of Variable Rate Basis one-month LIBOR    
Consolidated Subsidiaries Interest Rate Swap 1 [Domain]      
Cash flow hedges of interest rate risk [Abstract]      
Noncontrolling Interest, Ownership Percentage by Parent 100.00% 100.00%  
Derivative, Notional Amount $ 100,000    
Derivative, Fixed Interest Rate 2.14% 2.14%  
Derivative, Basis Spread on Variable Rate 1.55% 1.55%  
Total Swapped Rate On Loan 3.69% 3.69%  
Derivative, Maturity Date Feb. 01, 2022    
Consolidated Subsidiaries Interest Rate Swap 2 [Domain]      
Cash flow hedges of interest rate risk [Abstract]      
Noncontrolling Interest, Ownership Percentage by Parent 100.00% 100.00%  
Derivative, Notional Amount $ 100,000    
Derivative, Fixed Interest Rate 2.14% 2.14%  
Derivative, Basis Spread on Variable Rate 1.55% 1.55%  
Total Swapped Rate On Loan 3.69% 3.69%  
Derivative, Maturity Date Feb. 01, 2022    
Consolidated Subsidiaries Interest Rate Swap 3 [Domain]      
Cash flow hedges of interest rate risk [Abstract]      
Noncontrolling Interest, Ownership Percentage by Parent 100.00% 100.00%  
Derivative, Notional Amount $ 50,000    
Derivative, Fixed Interest Rate 2.14% 2.14%  
Derivative, Basis Spread on Variable Rate 1.55% 1.55%  
Total Swapped Rate On Loan 3.69% 3.69%  
Derivative, Maturity Date Feb. 01, 2022    
Consolidated Subsidiaries Interest Rate Swap 4 [Domain]      
Cash flow hedges of interest rate risk [Abstract]      
Noncontrolling Interest, Ownership Percentage by Parent 100.00% 100.00%  
Derivative, Notional Amount $ 50,000    
Derivative, Fixed Interest Rate 2.14% 2.14%  
Derivative, Maturity Date Feb. 01, 2022    
Unsecured Debt $ 25,000    
Consolidated Subsidiaries Interest Rate Swap 4 [Domain] | Line of Credit [Member]      
Cash flow hedges of interest rate risk [Abstract]      
Derivative, Basis Spread on Variable Rate 1.38% 1.38%  
Total Swapped Rate On Loan 3.51% 3.51%  
Unsecured Debt $ 1,100,000    
Derivative, Lower Range of Basis Spread, Variable Rate 1.05% 1.05%  
Derivative, Higher Range of Basis Spread, Variable Rate 1.60% 1.60%  
Derivative, Lower Range of Effective Rate, Variable Rate 3.19% 3.19%  
Derivative, Upper Range of Effective Rate, Variable Rate 3.74% 3.74%  
Consolidated Subsidiaries Interest Rate Swap 4 [Domain] | Unsecured Debt 275M Term Loan [Member]      
Cash flow hedges of interest rate risk [Abstract]      
Derivative, Basis Spread on Variable Rate 1.55% 1.55%  
Total Swapped Rate On Loan 3.69% 3.69%  
Unsecured Debt $ 275,000    
Derivative, Lower Range of Basis Spread, Variable Rate 1.15% 1.15%  
Derivative, Higher Range of Basis Spread, Variable Rate 1.80% 1.80%  
Derivative, Lower Range of Effective Rate, Variable Rate 3.29% 3.29%  
Derivative, Upper Range of Effective Rate, Variable Rate 3.94% 3.94%  
Consolidated Subsidiaries Interest Rate Swap 5 [Domain]      
Cash flow hedges of interest rate risk [Abstract]      
Noncontrolling Interest, Ownership Percentage by Parent 100.00% 100.00%  
Derivative, Notional Amount $ 125,000    
Derivative, Fixed Interest Rate 3.02% 3.02%  
Derivative, Basis Spread on Variable Rate 1.60% 1.60%  
Total Swapped Rate On Loan 4.62% 4.62%  
Derivative, Maturity Date Mar. 01, 2023    
Unsecured Debt $ 250,000    
Derivative, Lower Range of Basis Spread, Variable Rate 1.25% 1.25%  
Derivative, Higher Range of Basis Spread, Variable Rate 1.90% 1.90%  
Derivative, Lower Range of Effective Rate, Variable Rate 4.27% 4.27%  
Derivative, Upper Range of Effective Rate, Variable Rate 4.92% 4.92%  
Consolidated Subsidiaries Interest Rate Swap 6 [Domain]      
Cash flow hedges of interest rate risk [Abstract]      
Noncontrolling Interest, Ownership Percentage by Parent 100.00% 100.00%  
Derivative, Notional Amount $ 75,000    
Derivative, Fixed Interest Rate 3.02% 3.02%  
Derivative, Basis Spread on Variable Rate 1.60% 1.60%  
Total Swapped Rate On Loan 4.62% 4.62%  
Derivative, Maturity Date Mar. 01, 2023    
Consolidated Subsidiaries Interest Rate Swap 7 [Domain]      
Cash flow hedges of interest rate risk [Abstract]      
Noncontrolling Interest, Ownership Percentage by Parent 100.00% 100.00%  
Derivative, Notional Amount $ 50,000    
Derivative, Fixed Interest Rate 3.02% 3.02%  
Derivative, Basis Spread on Variable Rate 1.60% 1.60%  
Total Swapped Rate On Loan 4.62% 4.62%  
Derivative, Maturity Date Mar. 01, 2023    
Consolidated Subsidiaries Interest Rate Swap 8 [Domain]      
Cash flow hedges of interest rate risk [Abstract]      
Noncontrolling Interest, Ownership Percentage by Parent 100.00% 100.00%  
Derivative, 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]      
Cash flow hedges of interest rate risk [Abstract]      
Noncontrolling Interest, Ownership Percentage by Parent 50.10% 50.10%  
Derivative, Notional Amount $ 157,666    
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 2 (Member)      
Cash flow hedges of interest rate risk [Abstract]      
Noncontrolling Interest, Ownership Percentage by Parent 17.15% 17.15%  
Derivative, 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