Income Taxes - Net Current and Net Long-Term Deferred Tax Assets and Liabilities by Tax Jurisdiction (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred Tax Assets and Liabilities [Line Items]
Deferred Tax Assets, Current	$ 0	$ 0
Deferred Tax Assets, Long-term	1,933	2,055
Deferred Tax Liabilities, Current	0	0
Deferred Tax Liabilities, Long-term	34,561	39,265
Federal
Deferred Tax Assets and Liabilities [Line Items]
Deferred Tax Assets, Current	0	0
Deferred Tax Assets, Long-term	0	0
Deferred Tax Liabilities, Current	0	0
Deferred Tax Liabilities, Long-term	26,992	30,193
State
Deferred Tax Assets and Liabilities [Line Items]
Deferred Tax Assets, Current	0	0
Deferred Tax Assets, Long-term	0	0
Deferred Tax Liabilities, Current	0	0
Deferred Tax Liabilities, Long-term	2,902	3,728
Foreign
Deferred Tax Assets and Liabilities [Line Items]
Deferred Tax Assets, Current	0	0
Deferred Tax Assets, Long-term	1,933	2,055
Deferred Tax Liabilities, Current	0	0
Deferred Tax Liabilities, Long-term	$ 4,667	$ 5,344