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Share-based Compensation (Notes)
 3 Months Ended
Mar. 31, 2015
Share-based Compensation [Abstract]  
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]
Share-based Compensation
During the three months ended March 31, 2015, the Company granted 221 stock options, 116 restricted stock units and 24 performance units. Non-employee directors received 5 stock awards with a fair value of $171. During the three months ended March 31, 2015, participants in the Company’s stock option plans exercised options to purchase 37 shares of the Company’s common stock while 4 stock options were forfeited.
Stock options generally have a four-year graded 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 three months ended March 31, 2015, 34 restricted stock and restricted stock units vested while 2 shares of restricted stock and restricted stock units were forfeited. Also, during the three months ended March 31, 2015, 27 and 11 performance units and leveraged restricted share units vested, respectively.
Share-based compensation expense was $5,752 and $3,957 for the three months ended March 31, 2015 and 2014, respectively, and is included in selling, general and administrative expenses in the condensed consolidated statements of income and comprehensive (loss) income. As of March 31, 2015, total share-based compensation of $12,682 is expected to be recognized over the weighted-average period of approximately 2.2 years.