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Share-Based Compensation - Summary of Assumptions Used in the Option-Pricing Model (Details) (USD $)
6 Months Ended
Jun. 30, 2014
Share-based Compensation [Abstract]  
Expected volatility 50.10%
Dividend yield 3.20%
Risk-free interest rate 2.00%
Expected term 6 years
Weighted average grant date fair value of stock options $ 20.15
Share-based Compensation Arrangement by Share-based Payament Award, Fair Value Assumptions, Historical Average Volatility Rate of Peer Group 50.00%
Share-based Compensation Arrangement by Share-based Payament Award, Fair Value Assumptions, Historical Average Volatility Rate 50.00%