Shareholder's Equity (Narrative) (Details) (USD $)	0 Months Ended			3 Months Ended		9 Months Ended								3 Months Ended		9 Months Ended		0 Months Ended			9 Months Ended	0 Months Ended		0 Months Ended
	Aug. 29, 2014	Aug. 09, 2013	Apr. 24, 2012	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2013 Stock Repurchased Under Repurchase Program [Member]	Sep. 30, 2014 Stock Repurchased To Cover Employee Tax Withholdings [Member]	Sep. 30, 2013 Stock Repurchased To Cover Employee Tax Withholdings [Member]	Sep. 30, 2014 Stock Options [Member] Y	Sep. 30, 2014 Outside Directors [Member] Restricted Stock [Member]	Sep. 30, 2014 Employees [Member] Restricted Stock [Member] Y	Sep. 30, 2014 Stock Options [Member]	Sep. 30, 2013 Stock Options [Member]	Sep. 30, 2014 Stock Options [Member]	Sep. 30, 2013 Stock Options [Member]	Jul. 02, 2014 Common Stock [Member]	Aug. 29, 2014 Mandatory Convertible Preferred Stock [Member]	Jul. 02, 2014 Mandatory Convertible Preferred Stock [Member]	Sep. 30, 2014 Mandatory Convertible Preferred Stock [Member]	Jul. 16, 2014 Sheridan Healthcare [Member] Delay registration	Jul. 16, 2014 Sheridan Healthcare [Member]	Jul. 16, 2014 Sheridan Healthcare [Member] Common Stock [Member]	Sep. 30, 2014 Minimum [Member] Mandatory Convertible Preferred Stock [Member]	Sep. 30, 2014 Maximum [Member] Mandatory Convertible Preferred Stock [Member]
Issuance of stock (in shares)																		9,775,000		1,725,000
Issuance of stock, price per share																		$ 45.00		$ 100.00
Stock offering expenses																		$ 18,500,000		$ 5,900,000
Common Stock:
Shares of common stock issued for acquisition																								5,713,909
Minimum offering price																							100,000,000.0
Minimum anticipated offering price																							50,000,000.0
Number of demand registrations in a 360 day period																						3
Number of demands registration in 90 day period																						1
Registration effectiveness delay period																						60 days
Number of delays of registration effectiveness in 12 month period																						3
Registration effectiveness maximum delay in 12 month period																						120 days
Stock repurchased program authorized by the board of directors		40,000,000.0	40,000,000.0
Amount remaining under stock repurchase plan						27,100,000
Repurchase of common stock, shares								920,851	68,748	102,252
Repurchase of common stock								32,200,000	2,900,000	3,300,000
Average price per share								$ 34.91
Mandatory Convertible Preferred Stock
Dividend rate																					5.25%
Initial liquidation preference (usd per share)																					$ 100
Conversion rate																									1.8141	2.2222
Consecutive trading day																					20 days
Dividends declared (usd per share)																			$ 1.2979
Preferred stock dividends	2,200,000			2,239,000	0	2,239,000	0
Future preferred stock dividends (usd per share)																					$ 1.3125
Stock Incentive Plans:
Number of shares authorized for grant under share incentive plan				1,200,000		1,200,000
Shares available for future grants/issuance under stock incentive plan				1,132,862		1,132,862
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period											4 years	1 year	4 years
Number of installments in restricted stock granted.													3
Options term											10
Unrecognized compensation cost on non vested awards				$ 10,900,000		$ 10,900,000
Weighted average period						1 year 2 months 12 days
Number of anti-dilutive options														0	0	0	0