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Share-based Compensation (Notes)
 6 Months Ended
Jun. 30, 2015
Share-based Compensation [Abstract]  
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]
Share-based Compensation
During the six months ended June 30, 2015, the Company granted 221 stock options, 117 restricted stock units and 24 performance units, while non-employee directors received 10 stock awards with a fair value of $341. During the six months ended June 30, 2015, participants in the Company’s stock option plans exercised options to purchase 38 shares of the Company’s common stock, while 12 stock options were forfeited.
Stock options generally vest ratably over a four-year vesting period. Restricted stock and restricted stock units generally vest ratably over a three-year period, and performance units and leveraged restricted share units generally vest at the end of a three-year performance period based on the achievement of certain performance conditions. During the six months ended June 30, 2015, 35 restricted stock and restricted stock units vested while 3 shares of restricted stock and restricted stock units were forfeited. Also, during the six months ended June 30, 2015, 27 and 11 performance units and leveraged restricted share units vested, respectively.
Share-based compensation expense was $2,034 and $1,926 for the three months ended June 30, 2015 and 2014, respectively. Share-based compensation expense was $7,786 and $5,883 for the six months ended June 30, 2015 and 2014, respectively. Share-based compensation expense is included in selling, general and administrative expenses in the condensed consolidated statements of income and comprehensive income (loss). As of June 30, 2015, total share-based compensation of $10,617 is expected to be recognized over the weighted-average period of approximately 1.9 years.