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Share-based Compensation (Notes)
 6 Months Ended
Jun. 30, 2014
Share-based Compensation [Abstract]  
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]
Share-based Compensation
During the six months ended June 30, 2014, the Company granted 74 stock options, 37 shares of restricted stock and restricted stock units, 16 performance units and 19 leveraged restricted share units. Non-employee directors received 3 stock awards with a fair value of $247. During the six months ended June 30, 2014, participants in the Company’s stock option plans exercised options to purchase 16 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 six months ended June 30, 2014, 42 restricted stock and restricted stock units vested while 1 shares of restricted stock were forfeited. Also, during the six months ended June 30, 2014, 51 performance units vested while 1 performance units were forfeited.
Share-based compensation expense was $1,926 and $2,511 for the three months ended June 30, 2014 and 2013, respectively, and $5,883 and $5,075 for the six months ended June 30, 2014 and 2013, respectively. As of June 30, 2014, total share-based compensation of $13,264 is expected to be recognized over the weighted-average period of approximately 2.2 years.