Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Revenues	$ 389,006	$ 396,785	$ 791,931	$ 811,156
Operating expenses:
Direct salaries and related costs	252,161	264,924	513,889	539,996
General and administrative	104,282	102,037	208,962	204,477
Depreciation, net	13,052	14,560	26,949	29,396
Amortization of intangibles	4,127	3,629	8,413	7,842
Impairment of long-lived assets	129	5,175	1,711	8,701
Total operating expenses	373,751	390,325	759,924	790,412
Income from operations	15,255	6,460	32,007	20,744
Other income (expense):
Interest income	192	175	377	346
Interest (expense)	(1,179)	(1,149)	(2,357)	(2,355)
Other income (expense), net	(533)	(537)	77	(382)
Total other income (expense), net	(1,520)	(1,511)	(1,903)	(2,391)
Income before income taxes	13,735	4,949	30,104	18,353
Income taxes	2,466	(2,229)	7,148	227
Net income	$ 11,269	$ 7,178	$ 22,956	$ 18,126
Net income per common share:
Basic	$ 0.27	$ 0.17	$ 0.55	$ 0.43
Diluted	$ 0.27	$ 0.17	$ 0.54	$ 0.43
Weighted average common shares outstanding:
Basic	42,038	42,125	42,107	42,035
Diluted	42,094	42,160	42,200	42,197