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Share-based Compensation (Notes)
 3 Months Ended
Mar. 31, 2016
Share-based Compensation [Abstract]  
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]
Share-based Compensation
During the three months ended March 31, 2016, the Company granted 465 stock options, 249 restricted stock units and 48 performance units, while non-employee directors received 10 stock awards with a fair value of $171. During the three months ended March 31, 2016, participants in the Company’s stock option plans exercised options to purchase 1 shares of the Company’s common stock, while 34 stock options were forfeited and 10 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, 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, 2016, 71 restricted stock and restricted stock units vested while 16 shares of restricted stock and restricted stock units were forfeited. Also, during the three months ended March 31, 2016, 27 performance units vested while 5 performance units were forfeited. Additionally, during the three months ended March 31, 2016, 14 leveraged restricted share units vested.
Share-based compensation expense was $5,537 and $5,752 for the three months ended March 31, 2016 and 2015, respectively. Share-based compensation expense is included in selling, general and administrative expenses in the condensed consolidated statements of operations and comprehensive income (loss). As of March 31, 2016, total share-based compensation of $8,597 is expected to be recognized over the weighted-average period of approximately 2.3 years.