Schedule of Long-term Debt Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total long-term debt	$ 210,000	$ 261,000
Debt issuance costs	(1,834)	(1,567)
Long-term debt, net	208,166	259,433
2011 Senior Notes [Member]
Debt Instrument [Line Items]
Total long-term debt	150,000	150,000
2021 Senior Notes [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 60,000
Credit Facility [Member]
Debt Instrument [Line Items]
Total long-term debt		$ 111,000