XML 38 R28.htm IDEA: XBRL DOCUMENT v3.20.1
Long-Term Debt - Summary (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
May 30, 2017
Debt Instrument [Line Items]        
Total long-term debt $ 652,263 $ 631,568 $ 551,053  
Deferred finance costs, net 3,300 3,400 3,900  
Revolving Unsecured Credit Facility due 2024 | Line of Credit        
Debt Instrument [Line Items]        
Total long-term debt 330,000 335,000 255,000  
Revolving Unsecured Uncommitted Credit Facility due 2023 | Line of Credit        
Debt Instrument [Line Items]        
Total long-term debt 25,519 0 0  
5.375% senior unsecured notes due 2024 | Senior Notes        
Debt Instrument [Line Items]        
Total long-term debt $ 296,744 $ 296,568 $ 296,053  
Stated interest rate (as a percent) 5.375%     5.375%