UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Revenues	$ 265,302	$ 246,508
Costs and expenses:
Instructional and support costs	132,936	134,050
General and administration	69,226	64,139
Amortization of intangible assets	15,417	15,417
Merger and integration costs	3,764	7,179
Total costs and expenses	221,343	220,785
Income from operations	43,959	25,723
Other income	2,123	3,327
Income before income taxes	46,082	29,050
Provision for income taxes	10,843	17,550
Net income	$ 35,239	$ 11,500
Earnings per share:
Basic (dollars per share)	$ 1.62	$ 0.53
Diluted (dollars per share)	$ 1.60	$ 0.52
Weighted average shares outstanding:
Basic (in shares)	21,810	21,499
Diluted (in shares)	22,071	22,050