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Share-based compensation Nonqualified Stock Option Activity and Statistics (Details) - Nonqualified stock options (NQSOs)
$ in Thousands
12 Months Ended
Dec. 31, 2013
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Cash received from exercise $ 287
Intrinsic value of shares exercised 128
Tax benefit realized for the deduction of exercises $ 50