Income Taxes - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Income tax expense	$ (1,093)	$ (1,685)	$ (265)	$ (2,323)
Pre-tax income	$ 1,616	$ 11,249	$ (1,078)	$ 15,577
Effective income tax rate (percent)	67.60%	15.00%	(24.60%)	14.90%
Effective income tax rate reconciliation, tax exempt income, amount	$ (1,563)		$ (1,563)
Asset impairments	$ 6,514		$ 3,847	$ 0