CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities:
Net income	$ 11,487	$ 28,707
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	48,518	42,709
Non-cash interest expense	197	1,572
Non-cash stock compensation expense	27,696	14,022
Non-cash income tax benefit	(3,323)	(1,558)
Non-cash amortization on investments	2,966	2,653
Cash flows from changes in assets and liabilities, net of effects from acquisitions of businesses:
Restricted cash	84,004	69,383
Accounts receivable, net	(32,064)	(15,752)
Pharmaceutical inventory	(2,919)	5,332
Other assets	(31,551)	(27,675)
Accounts payable and accrued liabilities	(49,898)	(5,434)
Medical claims payable and other medical liabilities	45,544	18,657
Tax contingencies	(578)	1,164
Deferred credits and other long-term liabilities	12,645	3,366
Other	(48)	(95)
Net cash provided by operating activities	112,676	137,051
Cash flows from investing activities:
Capital expenditures	(37,653)	(32,007)
Acquisitions and investments in businesses, net of cash acquired	(55,943)	(124,995)
Purchase of investments	(293,348)	(112,088)
Maturity of investments	215,984	146,532
Net cash used in investing activities	(170,960)	(122,558)
Cash flows from financing activities:
Payments to acquire treasury stock	(68,783)	(65,254)
Proceeds from exercise of stock options and warrants	49,170	34,197
Payments on long-term debt and capital lease obligations	(8,299)	(2,087)
Payments on contingent consideration	(4,439)
Tax benefit from exercise of stock options and vesting of stock awards	3,774	2,384
Other	(616)	(1,143)
Net cash used in provided by financing activities	(29,193)	(31,903)
Net decrease in cash and cash equivalents	(87,477)	(17,410)
Cash and cash equivalents at beginning of period	255,303	203,187
Cash and cash equivalents at end of period	167,826	185,777
Non-cash investing activities:
Property and equipment acquired under capital leases	$ 1,987	$ 216