v2.4.0.8

Stockholders' Equity (Details) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Class of Stock [Line Items] |  |  |  |
Allocated Share-based Compensation Expense | $ 2,810,000 | $ 2,361,000 | $ 8,423,000 | $ 6,781,000
Treasury Stock, Shares, Acquired | 505,137 | 393,031 |  | 898,168
Treasury Stock Acquired, Average Cost Per Share | $ 13.98 | $ 13.49 | $ 15.37 | $ 13.76
Shares Repurchased to date |  |  | 5,853,975 |
2008 Repurchase Program [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  | 90,000,000 |
2012 Repurchase Program [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  | 50,000,000 |
Performance Shares [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Allocated Share-based Compensation Expense | $ 400,000 | $ 200,000 | $ 1,200,000 | $ 800,000

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