Dividends And Stock Repurchase Program (Narrative) (Details) (USD $)	0 Months Ended	6 Months Ended				6 Months Ended	0 Months Ended	6 Months Ended	0 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended
	Nov. 02, 2011	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 Authorized On May 20, 2011 [Member]	Dec. 31, 2011 Seventh Authorized Repurchase Program [Member]	Dec. 31, 2011 Sixth Repurchase Program [Member]	May 20, 2011 Declared On May 20, 2011 [Member]	Dec. 31, 2011 Declared On May 20, 2011 [Member]	Nov. 02, 2011 Declared On November 2, 2011 [Member]	Dec. 31, 2011 Declared On November 2, 2011 [Member]	Sep. 30, 2011 Recorded On June 30, 2011 [Member]	Dec. 31, 2011 Recorded On June 30, 2011 [Member]
Dividends And Stock Repurchase Program [Line Items]
Total dividend paid, recorded as reduction to retained earnings								$ 8,285,000		$ 10,039,000
The total dividend declared, recorded as reduction to retained earnings		10,039,000	8,360,000						10,040,000
Declaration date								May 20, 2011		Nov. 02, 2011
Stock repurchase program, expiry date				June 30, 2013	December 31, 2013
Stock repurchase program, completion date						December 2011
Repurchase program commencement date						June 2011
Authorized amount for repurchase							$ 100,000,000		$ 100,000,000
Record date	Dec. 08, 2011							Jun. 20, 2011		Dec. 08, 2011		Jun. 30, 2011
Payment date	Jan. 10, 2012	Jul. 11, 2011						Jul. 11, 2011		Jan. 10, 2012	Jul. 11, 2011