Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Fair Value Measurements (Details)

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Summary of Significant Accounting Policies - Fair Value Measurements (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Carrying value of fixed-rate long-term debt in excess of fair value $ (1,869)  
Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt value $ 309,377 $ 211,823