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Stock-Based Compensation Plans	3 Months Ended
Stock-Based Compensation Plans	Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation Plans	Stock-based Compensation Plans Grant Activities During the three months ended March 31, 2016 and 2015, the Company granted 55,545 and 60,165 restricted stock units to employees and non-employee directors from the 2010 Long-Term Incentive Plan at a weighted-average grant date fair value of $76.15 and $65.26, respectively. In the first quarter of 2016, the Company granted 72,564 performance-based shares to certain of its employees at a weighted-average grant date fair value of $76.35. The 72,564 performance shares represent the maximum that can be earned. The number of performance shares that employees ultimately earn will be based on the Company’s achievement of certain specified performance targets in 2016. In 2015, the Company granted 90,263 performance-based shares to employees at a weighted-average grant date fair value of $65.19, of which 71,128 shares were ultimately earned. Stock-based Compensation Cost Total stock-based compensation cost recognized in the unaudited condensed consolidated statements of operations as a component of selling, general and administrative expenses was $1.9 million for the three months ended March 31, 2016 and 2015. Total unrecognized compensation cost related to unvested share-based compensation arrangements was $11.5 million at March 31, 2016, which is expected to be recognized over a weighted-average period of 2.0 years. Total unrecognized compensation cost may be adjusted for any unearned performance shares or forfeited shares.