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Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying amount $ 1,034,907 $ 977,966
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying amount 1,034,907 977,966
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair Value 1,027,913 960,447
Interest Rate Swap | Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Interest rate swap agreements 572 0
Interest Rate Swap | Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Interest rate swap agreements $ 572 $ 0