CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue:
Total revenue	$ 704,589	$ 436,152	$ 421,582
Operating expenses:
Direct service costs, excluding depreciation and amortization	252,284	211,773	198,510
Reimbursed out-of-pocket expenses	236,775	49,690	50,961
Total direct costs	489,059	261,463	249,471
Selling, general and administrative	75,681	63,357	61,507
Depreciation	9,240	8,574	7,442
Amortization	29,561	37,900	50,672
Total operating expenses	603,541	371,294	369,092
Income from operations	101,048	64,858	52,490
Other expense, net:
Loss on extinguishment of debt	0	0	(10,726)
Miscellaneous income (expense), net	1,060	(354)	(423)
Interest expense, net	(8,157)	(7,559)	(19,384)
Total other expense, net	(7,097)	(7,913)	(30,533)
Income before income taxes	93,951	56,945	21,957
Income tax provision	20,766	17,823	8,532
Net income	$ 73,185	$ 39,122	$ 13,425
Net income per share attributable to common shareholders:
Basic	$ 2.05	$ 1.00	$ 0.38
Diluted	$ 1.97	$ 0.98	$ 0.37
Weighted average common shares outstanding:
Basic	35,547	39,056	35,690
Diluted	36,912	39,839	36,329
Revenue Net
Revenue:
Total revenue	$ 704,589	$ 0	$ 0
Direct Service Revenue
Revenue:
Total revenue	0	386,462	370,621
Reimbursed Out of Pocket Revenue
Revenue:
Total revenue	$ 0	$ 49,690	$ 50,961