General (Tables)

3 Months Ended

Mar. 31, 2013

Schedule of customers generating in excess of ten percent of net revenues for respective segment

Segment	Term Date	2012		2013

Commercial
Customer A	December 31, 2013(1)	$	49,743	$	51,641
Customer B	December 31, 2019		33,727		35,811
Customer C	December 31, 2012 to December 14, 2013(2)(3)		29,326		16,782	*
Public Sector
Customer D	June 30, 2013(4)		55,236		64,312
Radiology Benefits Management
Customer E	December 31, 2015		26,556		31,361
Customer F	June 30, 2014		14,378		15,235
Customer G	July 31, 2015		12,253		16,083
Customer H	January 31, 2014		9,104		9,759
Pharmacy Solutions
Customer I	November 30, 2013 to December 31, 2013(2)		31,044		33,311
Customer J	September 1, 2013 to April 29, 2014(2)		15,626		15,297
Customer K	September 27, 2013 to December 31, 2013(2)		14,647		21,641
Customer L	September 30, 2013(5)		21,108		15,245

*: Revenue amount did not exceed ten percent of net revenues for the respective segment for the period presented. Amount is shown for comparative purposes only.
(1): The customer has informed the Company that, after a competitive evaluation process, it has decided not to renew its contract after the contract expires on December 31, 2013.
(2): The customer has more than one contract. The individual contracts are scheduled to terminate at various points during the time period indicated above.
(3): Revenues for the three months ended March 31, 2012 of $13.2 million relate to a contract that terminated as of December 31, 2012.
(4): Contract has options for the customer to extend the term for two additional one-year periods.
(5): This customer represents a subcontract with a Public Sector customer and is eliminated in consolidation.

Schedule of fair value of financial assets and liabilities

	December 31, 2012

	Level 1		Level 2		Level 3		Total
Cash and cash equivalents(1)	$	—	$	102,137	$	—	$	102,137
Restricted cash(2)		—		82,839		—		82,839
Investments:
U.S. government and agency securities		1,065		—		—		1,065
Obligations of government-sponsored enterprises(3)		—		6,128		—		6,128
Corporate debt securities		—		214,547		—		214,547
Taxable municipal bonds		—		11,800		—		11,800
Certificates of deposit		—		150		—		150

December 31, 2012	$	1,065	$	417,601	$	—	$	418,666

	March 31, 2013

	Level 1		Level 2		Level 3		Total
Cash and cash equivalents(4)	$	—	$	72,282	$	—	$	72,282
Restricted cash(5)		—		117,120		—		117,120
Investments:
U.S. government and agency securities		1,065		—		—		1,065
Obligations of government-sponsored enterprises(3)		—		8,449		—		8,449
Corporate debt securities		—		236,472		—		236,472
Taxable municipal bonds		—		3,866		—		3,866
Certificates of deposit		—		150		—		150

March 31, 2013	$	1,065	$	438,339	$	—	$	439,404

(1): Excludes $87.3 million of cash held in bank accounts by the Company.
(2): Excludes $143.7 million of restricted cash held in bank accounts by the Company.
(3): Includes investments in notes issued by the Federal Home Loan Bank.
(4): Excludes $116.1 million of cash held in bank accounts by the Company.
(5): Excludes $104.7 million of restricted cash held in bank accounts by the Company.

Summary of short-term and long-term "available-for-sale" investments

	December 31, 2012

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
U.S. government and agency securities	$	1,065	$	—	$	—		$	1,065
Obligations of government-sponsored enterprises(1)		6,126		4		(2	)		6,128
Corporate debt securities		214,603		66		(122	)		214,547
Taxable municipal bonds		11,805		—		(5	)		11,800
Certificates of deposit		150		—		—			150

Total investments at December 31, 2012	$	233,749	$	70	$	(129	)	$	233,690

	March 31, 2013

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
U.S. government and agency securities	$	1,065	$	—	$	—		$	1,065
Obligations of government-sponsored enterprises(1)		8,449		4		(4	)		8,449
Corporate debt securities		236,655		49		(232	)		236,472
Taxable municipal bonds		3,871		—		(5	)		3,866
Certificates of deposit		150		—		—			150

Total investments at March 31, 2013	$	250,190	$	53	$	(241	)	$	250,002

(1): Includes investments in notes issued by the Federal Home Loan Bank.

Summary of maturity dates of investments

	Amortized Cost		Estimated Fair Value

2013	$	202,180	$	202,047
2014		44,253		44,205
2015		3,757		3,750

Total investments at March 31, 2013	$	250,190	$	250,002

Schedule of stock option activity

			Weighted Average Exercise Price

Outstanding, beginning of period	4,268,240		$	44.35
Granted	951,133			52.55
Forfeited	(21,122	)		47.13
Exercised	(205,755	)		45.88

Outstanding, end of period	4,992,496		$	45.83

Vested and expected to vest at end of period	4,923,356		$	45.77

Exercisable, end of period	2,813,512		$	42.61

Schedule of nonvested restricted stock award activity

		Weighted Average Grant Date Fair Value

Outstanding, beginning of period	23,672	$	42.25
Awarded	—		—
Vested	—		—
Forfeited	—		—

Outstanding, ending of period	23,672	$	42.25

Schedule of nonvested restricted stock units

			Weighted Grant Date Fair Value

Outstanding, beginning of period	202,690		$	47.38
Awarded	98,580			52.62
Vested	(93,804	)		46.70
Forfeited	(1,310	)		47.95

Outstanding, ending of period	206,156		$	50.19

- Definition

Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

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