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Interest Expense
6 Months Ended
Jun. 30, 2020
Interest and Debt Expense [Abstract]  
Interest Expense Interest Expense
The following tables present the components of interest expense: 
For the Three Months Ended June 30,For the Six Months
Ended June 30,
2020201920202019
 (Dollars in thousands)
Interest incurred on debt$19,300  $31,389  $43,392  $63,509  
Accretion of fair value adjustment on Senior Notes549  549  1,098  1,098  
Amortization of debt issuance costs1,031  1,031  2,062  2,062  
Total interest expense$20,880  $32,969  $46,552  $66,669  
Interest Rates
The 2018 Credit Agreement had an effective interest rate of 4.50% as of June 30, 2020 and 5.90% as of December 31, 2019. During the third quarter of 2019, the Company entered into four interest rate swap contracts to fix our cash flows associated with the risk in variability in the one-month US London Interbank Offered Rate ("US LIBOR") for a portion of our outstanding debt. See Note 10 "Derivative Instruments" for details of these transactions.