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Share-based Compensation (Notes)
 3 Months Ended
Mar. 31, 2017
Share-based Compensation [Abstract]  
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]
Share-based Compensation
During the three months ended March 31, 2017, the Company granted 324 stock options, 137 restricted stock units, 7 restricted stock, and 22 performance units. In addition, non-employee directors received 4 stock awards with a fair value of $146. During the three months ended March 31, 2017, participants in the Company’s stock option plans exercised options to purchase 1 shares of the Company’s common stock, while 5 stock options were forfeited and 2 stock options expired.
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. Performance 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, 2017, 118 restricted stock and restricted stock units vested while 2 restricted stock units were forfeited. Also, during the three months ended March 31, 2017, 22 performance units vested. Additionally, during the three months ended March 31, 2017, 6 leveraged restricted share units vested.
Share-based compensation expense was $6,274 and $5,537 for the three months ended March 31, 2017 and 2016, respectively. Share-based compensation expense is included in selling, general, and administrative expenses in the condensed consolidated statements of operations and comprehensive (loss) income. As of March 31, 2017, total share-based compensation of $10,736 is expected to be recognized over the weighted-average period of approximately 2.68 years.