Income Taxes - Deferred Tax Assets and Liabilities due to Temporary Differences (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Reserve for receivables	$ 625	$ 699
Accrued liabilities and inventory reserves	3,231	5,887
Net operating loss carryforward	31,555	21,733
Unrealized losses on interest rate swap contracts	1,338	25
Share-based compensation expense	3,044	2,609
Asset retirement obligations	1,101	2,481
Tangible and intangible assets	18,491	19,729
Deferred revenue	4,294	2,262
Other	4,057	6,587
Subtotal	67,736	62,012
Valuation allowance	(11,443)	(9,066)
Noncurrent deferred tax assets	56,293	52,946
Tangible and intangible assets	(88,017)	(79,978)
Asset retirement obligations	(29)	(30)
Unrealized gain on interest rate swap contracts	0	(5,048)
Other	(1,966)	(430)
Noncurrent deferred tax liabilities	(90,012)	(85,486)
Net deferred tax liability	$ (33,719)	$ (32,540)