Treasury Stock Treasury stock acquired (Details) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended
Sep. 30, 2013	Sep. 30, 2012
Treasury Stock Acquired from Share Awards Swap [Line Items]
Treasury stock shares acquired in share awards swap for income taxes	43,188
Treasury stock acquired - share awards swap for tax payments	$ 3,033	$ 0
Treasuy stock shares acquired from share awards swap	94,535

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

No definition available.

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