CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating activities
Net income	$ 49,166	$ 43,905	$ 55,324
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	19,212	19,085	18,584
Amortization of deferred financing costs and debt discount	1,214	1,214	1,214
Loss on disposal of fixed assets		185
Stock-based compensation	3,239	4,550	3,500
Provision for losses on accounts receivable	1,361	531	1,475
Deferred income taxes	(2,123)	9,551	(15,242)
Earnout liability	(417)	(900)	(1,786)
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	(7,747)	(511)	(1,154)
Inventories	4,054	(12,347)	894
Prepaid assets, refundable income taxes and other assets	(2,140)	(1,114)	65
Accounts payable	(2,562)	3,039	(2,487)
Accrued expenses and other current liabilities	6,491	312	5,481
Benefit obligations and other long-term liabilities	7,548	(9,319)	486
Net cash provided by operating activities	77,296	58,181	66,354
Investing activities
Capital expenditures	(11,533)	(9,690)	(7,563)
Acquisition of businesses			(7,385)
Net cash used in investing activities	(11,533)	(9,690)	(14,948)
Financing activities
Shares withheld on restricted stock vesting paid for employees' taxes	(50)	(23)	(923)
Payments of financing costs			(1,608)
Earnout payment			(5,487)
Dividends paid	(25,183)	(24,383)	(21,974)
Repayment of long-term debt	(32,685)	(33,140)	(3,148)
Net cash provided used in financing activities	(57,918)	(57,546)	(33,140)
Change in cash and cash equivalents	7,845	(9,055)	18,266
Cash and cash equivalents at beginning of year	27,820	36,875
Cash and cash equivalents at end of year	35,665	27,820	36,875
Non-cash operating and financing activities
Truck chassis inventory acquired through floorplan obligations	44,929	38,129	45,472
Pension settlement	6,609
Supplemental disclosure of cash flow information
Income taxes paid	13,283	8,465	6,607
Interest paid	$ 15,779	$ 15,878	$ 17,224