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Fair Value Measurements and Interest Rate Swaps - Fair Value of Financial Assets and Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying amount $ 1,093,655 $ 977,966
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying amount 1,093,655 977,966
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair Value 1,113,951 960,447
Interest Rate Swap | Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Interest rate swap liabilities 4,790 0
Interest Rate Swap | Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Interest rate swap liabilities $ 4,790 $ 0