CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 68,812	$ 48,102	$ 15,751
Reconciliation of net income to net cash provided by operating activities:
Depreciation	8,423	9,585	9,946
Amortization of intangible assets and fixed assets	21,682	18,915	17,197
Amortization of deferred financing costs	2,991	1,842	1,558
(Recovery of) provision for credit losses	(885)	659	67
Payment of contingent consideration liability in excess of acquisition-date fair value	(160)	(781)	(45)
Fair value adjustment on contingent consideration	1,738	2,311	504
Loss on debt extinguishment	1,201	0	0
Gain on sale of property and equipment	0	0	(282)
Restricted stock compensation expense	3,072	1,850	1,823
Deferred income taxes	(9,059)	(7,541)	6,140
Loss on sale of interest in VIE	0	1,193	0
Changes in operating assets and liabilities, and other:
Accounts receivable, net	13,293	(93,940)	(43,736)
Cost and estimated profits in excess of billings	(18,720)	(6,429)	3,991
Inventories	(2,026)	2,072	(5,290)
Prepaid expenses and other assets	9,666	(11,865)	649
Accounts payable and accrued expenses	10,604	35,965	27,004
Billings in excess of costs and estimated profits	(916)	6,858	(772)
Other long-term liabilities	(3,494)	(2,902)	2,584
Net cash provided by operating activities	106,222	5,894	37,089
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of property and equipment	(12,263)	(4,916)	(5,999)
Proceeds from the sale of property and equipment	0	0	1,669
Acquisition of businesses, net of cash acquired	(10,384)	(48,506)	(64,693)
Net cash used in investing activities	(22,647)	(53,422)	(69,023)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings on asset-backed credit facility	7,870	827,152	0
Repayments on asset-backed credit facility	(7,870)	(827,152)	0
Proceeds from debt	550,000	105,000	0
Principal debt payments	(429,508)	(3,567)	(3,300)
Debt issuance costs	(12,061)	(8,398)	0
Shares repurchased held in treasury	(56,215)	(47,872)	(33,511)
Payment for acquisition contingent consideration liability	(5,673)	(469)	(955)
Preferred dividends paid	(90)	(90)	(90)
Payment for employee taxes withheld from stock awards	(527)	(292)	(637)
Principal repayments on finance lease obligations	(2,347)	0	0
Net cash provided by (used in) financing activities	43,579	44,312	(38,493)
Effect of foreign currency on cash	(60)	253	88
Net change in cash and restricted cash	127,094	(2,963)	(70,339)
Cash and restricted cash at beginning of year	46,117	49,080	119,419
Cash and restricted cash at end of year	$ 173,211	$ 46,117	$ 49,080