Equity and Earnings Per Share (Computation Of Basic And Diluted Earnings Per Common Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		5 Months Ended	6 Months Ended		12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Oct. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Jun. 30, 2015	Jun. 30, 2014	Sep. 15, 2015	Sep. 14, 2015	Jun. 02, 2014
Class of Stock [Line Items]
Preferred Stock, Shares Authorized	5,000,000			5,000,000		5,000,000
Preferred Stock, Par or Stated Value Per Share	$ 0.01			$ 0.01		$ 0.01
Preferred Stock, Shares Outstanding	0			0		0
Common Stock, Shares Authorized	150,000,000			150,000,000		150,000,000
Common Stock, Par or Stated Value Per Share	$ 0.01			$ 0.01		$ 0.01
Common Stock, Shares, Outstanding	53,300,000			53,300,000		55,200,000
Disclosure of Repurchase Agreements [Abstract]
PercentOfSharesReceivedUnderASR	80.00%
Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract]
Net income attributable to common stock	$ 39,400	$ 38,800		$ 64,300	$ 75,900
Weighted average number of shares outstanding, used in computing basic earnings per share	53,300,000	54,800,000		54,100,000	54,800,000
Dilutive common stock equivalents	700,000	900,000		800,000	900,000
Weighted average number of shares outstanding used in computing diluted earnings per share	54,000,000	55,700,000		54,900,000	55,700,000
Basic earnings per share	$ 0.74	$ 0.71		$ 1.19	$ 1.39
Diluted earnings per share	$ 0.73	$ 0.70		$ 1.17	$ 1.36
Anti-dilutive options (excluded from the calculation of diluted earnings per share)	1,400,000	800,000		1,200,000	600,000
FY2016StockRepurchasePlan [Member] [Member] [Domain]
Disclosure of Repurchase Agreements [Abstract]
Stock Repurchase Program Authorized Amount								$ 200,000	$ 200,000
Treasury Stock, Shares, Acquired	2,274,343
Treasury Stock, Value, Acquired, Cost Method	$ 0
Accelerated Share Repurchases, Initial Price Paid Per Share	$ 70.35
FiscalYear2014StockRepurchasePlan [Member] [Member]
Disclosure of Repurchase Agreements [Abstract]
Stock Repurchase Program Authorized Amount										$ 150,000
Treasury Stock, Shares, Acquired	345,165		2,630,009			2,284,844
Treasury Stock, Value, Acquired, Cost Method						$ 150,000	$ 150,000
Accelerated Share Repurchases, Initial Price Paid Per Share			$ 57.03			$ 52.52