Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 6,598	$ 16,577
Trade accounts receivable, net of allowance for doubtful accounts of $1,223 in 2021 and $1,333 in 2020	53,520	43,837
Inventories	33,271	31,188
Prepaid expenses and other current assets	7,390	5,184
Current assets associated with discontinued operations	0	39
Total current assets	100,779	96,825
Property, plant, and equipment:
Land and building	13,409	13,259
Compressors and equipment	1,072,927	975,375
Vehicles	8,469	7,692
Construction in progress	31,968	12,763
Total property, plant, and equipment	1,126,773	1,009,089
Less accumulated depreciation	(556,311)	(457,688)
Net property, plant, and equipment	570,462	551,401
Other assets:
Deferred tax assets	5	10
Intangible assets, net of accumulated amortization of $33,672 in 2021 and $30,711 in 2020	22,095	25,057
Operating lease right-of-use assets	25,898	32,637
Other assets	3,122	4,036
Total other assets	51,120	61,740
Total assets	722,361	709,966
Current liabilities:
Accounts payable	28,958	19,766
Unearned income	2,187	269
Accrued liabilities and other	39,888	35,801
Amounts payable to affiliates	0	3,234
Current liabilities associated with discontinued operations	262	345
Total current liabilities	71,295	59,415
Other liabilities:
Long-term debt, net	631,141	638,631
Deferred tax liabilities	819	1,478
Operating lease liabilities	17,648	24,059
Other long-term liabilities	299	11,716
Total other liabilities	649,907	675,884
Commitments and contingencies
Partners’ capital:
General partner interest	(1,486)	(885)
Common units (140,386,811 units issued and outstanding at December 31, 2021 and 47,352,291 units issued and outstanding at December 31, 2020)	17,049	(10,055)
Accumulated other comprehensive income (loss)	(14,404)	(14,393)
Total partners’ capital (deficit)	1,159	(25,333)
Total liabilities and partners’ capital	$ 722,361	$ 709,966