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Shareholders' Equity (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2010 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Dividends |  |  |  |
Cash dividends declared per share of common stock (in dollars per share) |  | $ 0.15 | $ 0.15 | $ 0.15
Dividend restriction, base amount |  | $ 50,000,000 |  |
Dividend restriction, percentage of the consolidated net income calculated quarterly for the previous four fiscal quarters |  | 50.00% |  |
Dividend restriction, percentage of the net proceeds of all equity issuances made after the closing date of the Credit Facility and Term Loan Facility |  | 100.00% |  |
Issuance of Common Stock |  |  |  |
Public offering of common stock (in shares) | 9.2 |  |  |
Issue price of common stock (in dollars per share) | $ 25.00 |  |  |
Net proceeds from public offering of common stock | 218,800,000 |  |  | 218,816,000
Commissions paid to underwriters | 10,400,000 |  |  |
Expenses incurred in connection with the offering | 800,000 |  |  |
Stock Repurchase Programs |  |  |  |
Amount available to repurchase shares under stock repurchase program |  | $ 50,000,000 |  |

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