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Debt - Narrative (Details) - USD ($)
6 Months Ended
Jun. 30, 2019
Nov. 14, 2017
Revolving Credit Facility    
Debt Instrument [Line Items]    
Maximum borrowing capacity   $ 500,000,000
Weighted average interest rate 4.86%  
Remaining borrowing capacity $ 51,300,000  
Revolving Credit Facility | Minimum | Base Rate    
Debt Instrument [Line Items]    
Basis spread on variable rate 1.50%  
Revolving Credit Facility | Maximum | Base Rate    
Debt Instrument [Line Items]    
Basis spread on variable rate 2.50%  
Term Loan    
Debt Instrument [Line Items]    
Maximum borrowing capacity $ 200,000  
Amortization percentage 5.00%  
Sublimit for Issuance of Swing Loans    
Debt Instrument [Line Items]    
Maximum borrowing capacity   55,000,000
Standby Letters of Credit    
Debt Instrument [Line Items]    
Maximum borrowing capacity   $ 50,000,000
Line of credit $ 10,096,000  
Letter of Credit    
Debt Instrument [Line Items]    
Line of credit 2,795,000  
Environmental and Other Matters    
Debt Instrument [Line Items]    
Line of credit $ 7,301,000