Employee Share Based Plans (Details) (USD $)	0 Months Ended			1 Months Ended	3 Months Ended		9 Months Ended		36 Months Ended		60 Months Ended
	Dec. 15, 2016	Dec. 15, 2015	Dec. 15, 2014	Dec. 31, 2011	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2013	Jul. 31, 2012	Oct. 31, 2014	Dec. 15, 2013	Dec. 15, 2016	Oct. 31, 2012
Employee Share Based Plans Details [Abstract]
Unvested Shares Issued To CEO				64,700
Incentive Compensation Plan Percentage Of Common Stock Vested	50%	30%	20%
Share-based Compensation Expense					$ 1,848,000	$ 2,119,000	$ 5,505,000	$ 4,195,000
Liability					$ 12,076,000		$ 12,076,000					$ 10,631,000
Employee Stock Purchase Plan Exercise Price As A Percentage Of Fair Market Value					95.00%
Vesting Period For Common Stock Granted Years											5 years
Number Of Performance Periods Under Icp Plans Performance Awards									3 years
Number Of Performance Periods Under Icp Plans Retention Award										3 years
Maximum Statutory Withholdings Allowed					50.00%		50.00%