Treasury Stock Treasury stock acquired (Details) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012
Treasury Stock Acquired from Share Awards Swap [Line Items]
Treasury stock shares acquired in share awards swap for income taxes	27,260
Treasury stock acquired - share awards swap for tax payments	$ 1,792	$ 0
Treasuy stock shares acquired from share awards swap	55,704

Treasury stock acquired in share awards swap for employee income taxes paid

No definition available.

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