Long-Term Debt, Maturities of Long-Term Debt (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Maturities of Long-term Debt [Abstract]
2019	$ 69,455
2020	27,500
2021	30,000
2022	37,500
2023	270,000
Thereafter	0
Total	434,455	[1]
Unamortized debt discount and debt issuance costs	$ 4,000

[1] The carrying value of the debt reflects the amounts stated in the above table less a debt discount of $4.0 million, which is not reflected in this table.