Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 128,458	$ 110,635
Restricted cash	7,232	9,103
Accounts receivable, net of allowance for doubtful accounts of $648 and $851 at March 31, 2017 and December 31, 2016, respectively; and net of estimated allowance for refunds and appeals of $35,518 and $41,020 at March 31, 2017 and December 31, 2016, respectively	62,072	67,735
Prepaid expenses and other current assets	17,847	14,957
Total current assets	215,609	202,430
Property and equipment, net	70,286	67,640
Goodwill	1,196,121	1,196,024
Intangible assets, net	518,131	533,305
Other long-term assets	2,746	2,864
TOTAL ASSETS	2,002,893	2,002,263
Current liabilities:
Current maturities of long-term debt	18,000	18,000
Customer deposits	7,232	9,103
Accounts payable and accrued other expenses	26,736	23,162
Accrued compensation costs	29,379	58,589
Estimated liability for refunds and appeals	61,766	62,539
Total current liabilities	143,113	171,393
Long-term liabilities:
Long-term debt	758,348	762,202
Other long-term liabilities	5,765	8,799
Deferred tax liabilities	119,759	120,533
Total long-term liabilities	883,872	891,534
Total liabilities	1,026,985	1,062,927
Commitments and contingencies (Note 6)
Stockholders' equity:
Common stock ($0.001 par value; 600,000,000 shares authorized, 91,845,947 and 90,748,740 issued, and 91,838,470 and 90,741,340 outstanding at March 31, 2017 and December 31, 2016, respectively)	92	91
Additional paid-in capital	921,186	911,582
Retained earnings	60,892	33,917
Accumulated other comprehensive loss	(6,161)	(6,156)
Treasury stock, at cost (7,477 and 7,400 shares at March 31, 2017 and December 31, 2016, respectively)	(101)	(98)
Total stockholders' equity	975,908	939,336
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 2,002,893	$ 2,002,263