Share-based Compensation (Schedule of Stock Option Activity) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Balance at beginning of period, shares	627,000
Exercised, shares	(42,000)
Forfeited or expired, shares	0
Outstanding at end of period, shares	585,000
Exercisable at end of period, shares	585,000
Balance at beginning of period, weighted average exercise price	$ 11.98
Exercised, weighted average exercise price	$ 13.17
Forfeited or expired, weighted average exercise price	$ 0
Outstanding at end of period, weighted average exercise price	$ 11.89
Exercisable at end of period, weighted average exercise price	$ 11.89
Outstanding at end of period, weighted average remaining contractual term	2 years 5 months 9 days
Exercisable at end of period, weighted average remaining contractual term	2 years 5 months 9 days
Outstanding at end of period, aggregate intrinsic value	$ 32,516
Exercisable at end of period, aggregate intrinsic value	$ 32,516