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Debt and Credit Agreements - Outstanding Amounts Under Revolving Credit Facility (Details) - Line of Credit [Member]
$ in Thousands
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]  
Line of Credit Facility, Remaining Borrowing Capacity $ 607,648
Line of Credit Facility, Maximum Borrowing Capacity 700,000
Long-term Line of Credit 67,000
Letters of Credit Outstanding, Amount $ 25,352