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Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying amount $ 1,076,759 $ 977,966
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying amount 1,076,759 977,966
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair Value 1,083,095 960,447
Interest Rate Swap | Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Interest rate swap agreements 1,647,029 0
Interest Rate Swap | Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Interest rate swap agreements $ 1,647,029 $ 0