Equity and Earnings Per Share (Computation Of Basic And Diluted Earnings Per Common Share) (Details) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended	5 Months Ended	12 Months Ended	15 Months Ended	1 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Jun. 30, 2014	Oct. 31, 2014	Jun. 30, 2013	Sep. 30, 2013	Mar. 31, 2013	Sep. 30, 2012	Jun. 02, 2014	Aug. 01, 2013
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	54,774,686		54,774,686		54,661,877
Disclosure of Repurchase Agreements [Abstract]
PercentOfSharesReceivedUnderASR					80.00%
Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract]
Net income attributable to common stock	$ 38,760,000	$ 28,329,000	$ 75,902,000	$ 54,283,000
Weighted average number of shares outstanding, used in computing basic earnings per share	54,823,000	56,517,000	54,781,000	56,386,000
Dilutive common stock equivalents	886,000	878,000	955,000	1,009,000
Weighted average number of shares outstanding used in computing diluted earnings per share	55,709,000	57,395,000	55,736,000	57,395,000
Basic earnings per share	$ 0.71	$ 0.50	$ 1.39	$ 0.96
Diluted earnings per share	$ 0.70	$ 0.49	$ 1.36	$ 0.95
Anti-dilutive options (excluded from the calculation of diluted earnings per share)	814,000	425,000	616,000	260,000
FiscalYear2014StockRepurchasePlan [Member] [Member]
Disclosure of Repurchase Agreements [Abstract]
Stock Repurchase Program Authorized Amount											150,000,000
Treasury Stock, Shares, Acquired	345,165				2,284,844	2,630,009
Treasury Stock, Value, Acquired, Cost Method					150,000,000
Accelerated Share Repurchases, Initial Price Paid Per Share					$ 52.52	$ 57.03
FiscalYear2013StockRepurchasePlan [Member]
Disclosure of Repurchase Agreements [Abstract]
Stock Repurchase Program Authorized Amount												200,000,000
Treasury Stock, Shares, Acquired								5,458,285
Treasury Stock, Value, Acquired, Cost Method				2,400,000			197,600,000	200,000,000
Treasury Stock, Value, Acquired, Average Cost Per Share								$ 36.64
March 2013 Accelerated Share Repurchase [Member]
Disclosure of Repurchase Agreements [Abstract]
Treasury Stock, Shares, Acquired				101,247
Treasury Stock, Value, Acquired, Cost Method									50,000,000
March Open Market Repurchases [Member]
Disclosure of Repurchase Agreements [Abstract]
Treasury Stock, Shares, Acquired				51,071
Treasury Stock, Value, Acquired, Cost Method									50,000,000
September 2012 Accelerated Share Repurchase [Member]
Disclosure of Repurchase Agreements [Abstract]
Treasury Stock, Value, Acquired, Cost Method										50,000,000
September Open Market Repurchases [Member]
Disclosure of Repurchase Agreements [Abstract]
Treasury Stock, Value, Acquired, Cost Method										$ 50,000,000