Stock-Based Compensation Plans	9 Months Ended
Stock-Based Compensation Plans	Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation Plans	Stock-based Compensation Plans Grant Activities During the nine months ended September 30, 2016 and 2015, the Company granted 124,077 and 124,170 restricted stock units to employees and non-employee directors under the 2010 Long-Term Incentive Plan at a weighted-average grant date fair value of $38.21 and $32.47, respectively. For the nine months ended September 30, 2016, the Company granted 156,576 performance-based shares to certain of its employees at a weighted-average grant date fair value of $38.47. The 156,576 performance shares represent the maximum number 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 for the full year of 2016, to be measured in early 2017. In 2015, the Company granted 180,526 performance-based shares to employees at a weighted-average grant date fair value of $32.60, of which 142,256 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 and $2.7 million for the three months ended September 30, 2016 and 2015, respectively. During the nine months ended September 30, 2016 and 2015, the Company recognized stock-based compensation cost of $5.5 million and $6.7 million, respectively. Total unrecognized compensation cost related to unvested share-based compensation arrangements was $8.2 million at September 30, 2016, which is expected to be recognized over a weighted-average period of 1.5 years. Total unrecognized compensation cost may be adjusted for any unearned performance shares or forfeited shares.

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.