Share Based Payments (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012
Summary of stock option activity under all equity plans
Beginning balance, number of shares	2,750	2,304	2,371
Options granted, number of shares		616	26
Options exercised, number of shares	(123)	(136)	(82)
Options canceled or expired, number of shares	(34)	(34)	(11)
Ending balance, number of shares	2,593	2,750	2,304
Beginning balance, weighted average exercise price	$ 21.03	$ 15.96	$ 15.34
Options granted, weighted average exercise price		$ 40.74	$ 32.90
Options exercised, weighted average exercise price	$ 3.84	$ 1.27	$ 3.48
Options canceled or expired, weighted average exercise price	$ 22.72	$ 112.92	$ 16.03
Ending balance, weighted average exercise price	$ 21.82	$ 21.03	$ 15.96