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Fair Value of Financial Instruments - Fair Value Disclosures (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and Cash Equivalents $ 32,611 $ 17,198
Long-term Debt, Fair Value 2,495,223 2,290,537
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and Cash Equivalents 32,611 17,198
Long-Term Debt (Excluding Debt Issuance Costs) $ 2,628,522 $ 2,387,001