Consolidated Statements Of Stockholders' Equity (USD $) In Thousands, except Share data	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Other Comprehensive Income [Member]	Accumulated Deficit [Member]	Total
Stockholders' Equity Attributable to Parent, Beginning Balance at Dec. 31, 2009	$ 47	$ 222,229	$ 22	$ (164,905)	$ 57,393
Balance, shares at Dec. 31, 2009	47,218,000
Net income				21,081	21,081
Other comprehensive income			45		45
Issuance of common stock from exercise of stock options and employee stock purchase plan	1	1,401			1,402
Issuance of common stock from exercise of stock options and employee stock purchase plan, shares	746,000
Issuance of common stock from exercise of warrants, net of repurchases, shares	47,000
Compensation related to stock option awards		2,267			2,267
Stockholders' Equity Attributable to Parent, Ending Balance at Dec. 31, 2010	48	225,897	67	(143,824)	82,188
Balance, shares at Dec. 31, 2010	48,011,000
Net income				28,122	28,122
Other comprehensive income			2,277		2,277
Issuance of common stock for acquisition of NovaMed	8	31,522			31,530
Issuance of common stock for acquisition of NovaMed, shares	8,298,000				8,298,110
Issuance of common stock from exercise of stock options and employee stock purchase plan	3	6,319			6,322
Issuance of common stock from exercise of stock options and employee stock purchase plan, shares	2,319,000
Compensation related to stock option awards		3,175			3,175
Repurchase of common stock	(1)			(3,494)	(3,495)
Repurchase of common stock, shares	(781,000)				(781,000)
Stockholders' Equity Attributable to Parent, Ending Balance at Dec. 31, 2011	58	266,913	2,344	(119,196)	150,119
Balance, shares at Dec. 31, 2011	57,847,000
Net income				9,620	9,620
Other comprehensive income			644		644
Issuance of common stock from exercise of stock options, restricted stock units, and employee stock purchase plan	1	3,491			3,492
Issuance of common stock from exercise of stock options, restricted stock units, and employee stock purchase plan, shares	1,346,000
Compensation related to stock option awards		3,983			3,983
Repurchase of common stock	(5)			(24,831)	(24,836)
Repurchase of common stock, shares	(4,709,000)				(4,709,000)
Stockholders' Equity Attributable to Parent, Ending Balance at Dec. 31, 2012	$ 54	$ 274,387	$ 2,988	$ (134,407)	$ 143,022
Balance, shares at Dec. 31, 2012	54,484,000