CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Statement [Abstract]
Revenue from Contract with Customer, Product and Service [Extensible List]	Service	Service	Service
Revenue from services	$ 2,019,728	$ 2,806,609	$ 1,676,652
Operating expenses:
Direct operating expenses	1,569,318	2,178,923	1,301,653
Selling, general and administrative expenses	300,391	324,935	216,360
Bad debt expense	14,562	9,609	4,783
Depreciation and amortization	18,347	12,576	9,852
Restructuring costs	2,553	1,861	2,630
Legal settlement charges	1,125	0	0
Impairment charges	719	5,597	2,070
Total operating expenses	1,907,015	2,533,501	1,537,348
Income from operations	112,713	273,108	139,304
Other expenses (income):
Interest expense	8,094	14,391	6,866
Loss on early extinguishment of debt	1,723	3,728	0
Other expense (income), net	2	(1,336)	(770)
Income before income taxes	102,894	256,325	133,208
Income tax expense	30,263	67,864	1,206
Net income attributable to common stockholders	72,631	188,461	132,002
Other comprehensive income:
Unrealized foreign currency translation income (loss), net of tax	2	(94)	(13)
Comprehensive income (loss) attributable to common stockholders	$ 72,633	$ 188,367	$ 131,989
Net income per share attributable to common stockholders - Basic (usd per share)	$ 2.07	$ 5.09	$ 3.60
Net income per share attributable to common stockholders - Diluted (usd per share)	$ 2.05	$ 5.02	$ 3.53
Weighted average common shares outstanding:
Basic (in shares)	35,158	37,012	36,689
Diluted (in shares)	35,476	37,536	37,392