Shareholders' Equity (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Components of share-based compensation expense
Total share-based payment expense	$ 300	$ 464	$ 585	$ 930
Stock Option expense [Member]
Components of share-based compensation expense
Total share-based payment expense	66	137	132	253
Restricted stock expense [Member]
Components of share-based compensation expense
Total share-based payment expense	8	89	17	168
Restricted stock unit expense [Member]
Components of share-based compensation expense
Total share-based payment expense	58	48	110	107
SAR expense [Member]
Components of share-based compensation expense
Total share-based payment expense	168	156	326	334
ESPP expense [Member]
Components of share-based compensation expense
Total share-based payment expense		$ 34		$ 68