Shareholder's Equity (Narrative) (Details)				3 Months Ended		6 Months Ended
	Mar. 03, 2015 USD ($) $ / shares	Jul. 16, 2014 shares	Jul. 02, 2014 USD ($) $ / shares shares	Jun. 30, 2015 USD ($) $ / shares shares	Jun. 30, 2014 USD ($) shares	Jun. 30, 2015 USD ($) installment $ / shares shares	Jun. 30, 2014 USD ($) shares	Aug. 09, 2013 USD ($)
Common Stock:
Stock repurchased program authorized by the board of directors | $								$ 40,000,000.0
Mandatory Convertible Preferred Stock
Preferred stock dividends | $	$ 2,300,000			$ 2,264,000	$ 0	$ 4,528,000	$ 0
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				893,347		893,347
Unrecognized compensation cost on non vested awards | $				$ 24,400,000		$ 24,400,000
Weighted average period						1 year 2 months 13 days
Number of units granted						313,498
Grant date value of common stock | $ / shares						$ 56.19
Stock Repurchased To Cover Employee Tax Withholdings [Member]
Common Stock:
Repurchase of common stock, shares						67,000	68,014
Repurchase of common stock | $						$ 3,700,000	$ 2,900,000
Stock Options [Member]
Stock Incentive Plans:
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period						4 years
Options term						10 years
Employees [Member] | Restricted Stock [Member]
Stock Incentive Plans:
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period						4 years
Number of installments in restricted stock granted. | installment						3
Mandatory Convertible Preferred Stock [Member]
Stock Incentive Plans:
Number of anti-dilutive options				3,100,000		3,100,000
Stock Options [Member]
Stock Incentive Plans:
Number of anti-dilutive options				0	0	0	0
Common Stock [Member]
Issuance of stock (in shares)			9,775,000
Issuance of stock, price per share | $ / shares			$ 45.00
Stock offering expenses | $			$ 18,500,000
Mandatory Convertible Preferred Stock [Member]
Issuance of stock (in shares)			1,725,000
Issuance of stock, price per share | $ / shares			$ 100.00
Stock offering expenses | $			$ 5,900,000
Mandatory Convertible Preferred Stock
Dividend rate						5.25%
Initial liquidation preference (usd per share) | $ / shares				$ 100		$ 100
Consecutive trading day						20 days
Dividends declared (usd per share) | $ / shares	$ 1.3125
Sheridan Healthcare [Member] | Common Stock [Member]
Common Stock:
Shares of common stock issued for acquisition		5,713,909
Minimum [Member] | Mandatory Convertible Preferred Stock [Member]
Mandatory Convertible Preferred Stock
Conversion rate				1.8141		1.8141
Maximum [Member] | Mandatory Convertible Preferred Stock [Member]
Mandatory Convertible Preferred Stock
Conversion rate				2.2222		2.2222
Performance-based Restricted Stock Units [Member]
Stock Incentive Plans:
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period						3 years
Number of units granted						68,533
Grant date value of common stock | $ / shares						$ 55.40
Performance goal period for vesting						1 year
Projected vesting percentage						150.00%
Performance-based Restricted Stock Units [Member] | Minimum [Member]
Stock Incentive Plans:
Projected vesting percentage						0.00%
Performance-based Restricted Stock Units [Member] | Maximum [Member]
Stock Incentive Plans:
Projected vesting percentage						150.00%