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Debt Credit Agreements (Details Textual) (Details)
$ in Thousands
1 Months Ended 12 Months Ended
Dec. 19, 2018
USD ($)
Oct. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Feb. 26, 2019
USD ($)
Mar. 31, 2018
USD ($)
Mar. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]              
Secured debt, percentage of mortgages used as security     80.00%        
Deferred loan costs     $ 2,000        
Repay deficit in agreement, period     6 months        
Borrowings under Credit Agreement     $ 40,000       $ 0
Outstanding letters of credit     3,000        
Long-term line of credit     220,000        
Third Amended Credit Agreement              
Debt Instrument [Line Items]              
Senior secured revolving credit maximum facility   $ 850,000          
Maximum borrowing capacity, amended   1,500,000          
EBITDA ratio, debt outstanding, cash and cash equivalents limit     $ 50,000        
Debt to EBITDA ratio covenant     4.00        
Third Amended Credit Agreement | Minimum              
Debt Instrument [Line Items]              
Commitment fee percentage     0.375%        
Third Amended Credit Agreement | Maximum              
Debt Instrument [Line Items]              
Commitment fee percentage     0.50%        
Eurodollar | Third Amended Credit Agreement | Minimum              
Debt Instrument [Line Items]              
Additional interest rate     1.25%        
Eurodollar | Third Amended Credit Agreement | Maximum              
Debt Instrument [Line Items]              
Additional interest rate     2.25%        
Federal Funds Effective Rate | Third Amended Credit Agreement              
Debt Instrument [Line Items]              
Basis spread on variable rate     0.50%        
Base Rate Loan | Third Amended Credit Agreement | Maximum              
Debt Instrument [Line Items]              
Additional interest rate     1.25%        
Revolving Credit Facility              
Debt Instrument [Line Items]              
Senior secured revolving credit maximum facility   $ 500,000          
Decrease in borrowing rate   0.25%          
Revolving Credit Facility | Minimum              
Debt Instrument [Line Items]              
Leverage ratio   4.00          
Revolving Credit Facility | Maximum              
Debt Instrument [Line Items]              
Leverage ratio   1.00          
Revolving Credit Facility | Credit Agreement              
Debt Instrument [Line Items]              
Senior secured revolving credit maximum facility         $ 725,000 $ 525,000  
Line of Credit | San Mateo Credit Facility              
Debt Instrument [Line Items]              
Senior secured revolving credit maximum facility $ 250,000            
Outstanding letters of credit     $ 0        
Accordian feature, increase limit $ 400,000            
Deferred loan costs     1,900        
Long-term line of credit     $ 220,000        
Line of Credit | San Mateo Credit Facility | Minimum              
Debt Instrument [Line Items]              
Commitment fee percentage 0.30%            
Line of Credit | San Mateo Credit Facility | Maximum              
Debt Instrument [Line Items]              
Commitment fee percentage 0.50%            
Libor Rate | Third Amended Credit Agreement              
Debt Instrument [Line Items]              
Basis spread on variable rate     1.00%        
Base Rate Loan | Minimum              
Debt Instrument [Line Items]              
Additional interest rate     0.25%        
Subsequent Event              
Debt Instrument [Line Items]              
Borrowings under Credit Agreement       $ 80,000      
Outstanding letters of credit       13,700      
Subsequent Event | Line of Credit | San Mateo Credit Facility              
Debt Instrument [Line Items]              
Outstanding letters of credit       16,200      
Debt outstanding       $ 220,000      
Federal Funds Effective Rate | Line of Credit | San Mateo Credit Facility              
Debt Instrument [Line Items]              
Basis spread on variable rate 0.50%            
Adjusted LIBO Rate | Line of Credit | San Mateo Credit Facility              
Debt Instrument [Line Items]              
Basis spread on variable rate 1.00%            
Adjusted LIBO Rate | Line of Credit | San Mateo Credit Facility | Minimum              
Debt Instrument [Line Items]              
Additional interest rate 0.50%            
Adjusted LIBO Rate | Line of Credit | San Mateo Credit Facility | Maximum              
Debt Instrument [Line Items]              
Additional interest rate 1.50%            
Statutory Reserve Rate | Line of Credit | San Mateo Credit Facility | Minimum              
Debt Instrument [Line Items]              
Additional interest rate 1.50%            
Statutory Reserve Rate | Line of Credit | San Mateo Credit Facility | Maximum              
Debt Instrument [Line Items]              
Additional interest rate 2.50%            
The Bank Of Nova Scotia | San Mateo Credit Facility              
Debt Instrument [Line Items]              
Debt to EBITDA ratio covenant 5.00            
Interest coverage ratio 2.50