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Stockholders' Equity (Details) (USD $) | 0 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Nov. 16, 2012 | Feb. 21, 2012 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Mar. 30, 2011
Stockholders Equity [Line Items] |  |  |  |  |  |
Gross proceeds from the sale of common stock |  | $ 225,000,000 |  |  |  |
Sale of common stock, price per share |  | $ 36.75 |  |  |  | $ 31.50
Sale of common stock, value |  |  | 218,961,000 |  |  |
Net proceeds from sale of common stock |  |  |  | 175,229,000 |  |
Stock repurchase program, authorized amount | 100,000,000 |  |  |  |  |
Restricted stock awards, value of shares withheld for taxes |  |  | 26,732,000 | 0 | 0 |
Common Stock [Member] |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |
Sale of common stock, shares |  |  | 6,122,449 | 5,750,000 |  |
Sale of common stock, value |  |  | $ 6,000 | $ 6,000 |  |

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