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Acquisitions - Identifiable assets and liabilities (Details) - USD ($)
$ in Thousands
Apr. 02, 2018
Feb. 28, 2018
Noralta    
Acquired Indefinite-lived Intangible Assets [Line Items]    
Amortizable Intangible Assets $ 114,383  
Amortizable Intangible Liabilities 2,456  
Net intangible assets 111,927  
Noralta | Unfavorable Lease Contracts    
Acquired Indefinite-lived Intangible Assets [Line Items]    
Amortizable Intangible Liabilities 2,456  
Noralta | Trade name    
Acquired Indefinite-lived Intangible Assets [Line Items]    
Amortizable Intangible Assets 1,474  
Noralta | Contract-Based Intangible Assets    
Acquired Indefinite-lived Intangible Assets [Line Items]    
Amortizable Intangible Assets 110,413  
Noralta | Favorable lease contract    
Acquired Indefinite-lived Intangible Assets [Line Items]    
Amortizable Intangible Assets $ 2,496  
Lakeland    
Acquired Indefinite-lived Intangible Assets [Line Items]    
Amortizable Intangible Assets   $ 8,200