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Stock Based Compensation (Tables)
3 Months Ended
Mar. 31, 2015
Share-based Compensation [Abstract]  
Schedule of Share-based Compensation, Common Stock, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
Weighted-average
Number grant dateAggregate Vesting
of shares fair valuefair valueperiod
Restricted stock 299$55.81$16,6921 - 4 years
Restricted stock units 455.782454 years