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Stockholders' Equity (Details) (USD $) | 0 Months Ended | 1 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 04, 2013 | Nov. 30, 2012 | Nov. 16, 2012 | Feb. 21, 2012 | Dec. 31, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Payments of Dividends |  |  |  |  |  | $ 6,149,000 | $ 0 |
Common Stock, Dividends, Per Share, Cash Paid | $ 0.125 |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  | 100,000,000 |  |  |  |  |
Treasury Stock, Shares, Acquired |  | 256,262 |  |  | 873,146 |  |  | 1,129,408
Treasury Stock Acquired, Average Cost Per Share |  | $ 21.58 |  |  | $ 24.26 |  |  | $ 23.65
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  | 94,470,000 |  |  | 73,268,000 |  |  |
Gross proceeds from the issuance of common stock |  |  |  | 225,000,000 |  |  |  |
Stock issued during period |  |  |  | 6,122,000 |  |  |  |
Sale of stock, price per share |  |  |  | $ 36.75 |  |  |  |
Proceeds from sale of common stock, net of issuance costs |  |  |  |  |  | $ 0 | $ 218,983,000 |
Common Stock, Dividends, Per Share, Declared | $ 0.50 |  |  |  |  |  |  |

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