Long-Term Debt (Summary of Long-term Debt) (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Gross long-term debt	$ 649,303
Less: deferred issuance costs	(6,500)	$ (8,448)
Total debt	642,803	733,980
Less: current portion, net of debt issuance costs	(16,599)	(8,575)
Long-term debt, net of current portion	626,204	725,405
Senior Notes
Debt Instrument [Line Items]
Gross long-term debt	649,303	742,428
2026 Senior Notes | Senior Notes
Debt Instrument [Line Items]
Gross long-term debt	259,082	280,014
2028 Senior Notes | Senior Notes
Debt Instrument [Line Items]
Gross long-term debt	$ 390,221	$ 462,414