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Shareholders' Equity (Common Stock) (Details) (USD $) In Millions, except Share data, unless otherwise specified | 0 Months Ended | 1 Months Ended | 3 Months Ended |  |  |  |  | 1 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 04, 2013 | Jul. 19, 2012 | Mar. 31, 2012 | May 04, 2013 | Feb. 02, 2013 | Sep. 27, 2012 | Jul. 17, 2012 | Apr. 28, 2012 | Mar. 31, 2012 Performance Based Vesting Schedule [Member] | May 14, 2013 Subsequent Event [Member]
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Options cancelled (shares) |  |  | 2,020,620 |  |  |  |  |  | 1,010,310 |
Restricted stock units vesting percentage (percent) |  |  | 33.00% |  |  |  |  |  |  |
Restricted stock units, reminaing percentage to vest (percent) |  |  |  | 67.00% |  |  |  |  |  |
Compensation expense |  |  | $ 17.4 |  |  |  |  |  |  |
Expenses on date of modification |  |  | 5.3 |  |  |  |  |  |  |
Vesting period from the date of grant (years) |  |  | 2 years |  |  |  |  |  |  |
Reverse stock split ratio |  |  |  |  |  |  | 0.3460 |  |  |
Common stock, shares authorized |  |  |  | 120,000,000 | 120,000,000 |  | 120,000,000 | 120,000,000 |  |
Preferred stock dividend, percentage |  | 8.00% |  |  |  |  |  |  |  |
Number of shares of common stock reserved for issuance (years) |  |  |  |  |  | 500,000 |  |  |  |
Discount on common stock fair value for employee purchases (percent) |  |  |  |  |  | 10.00% |  |  |  |
Initial public offering shares | 13,012,250 |  |  |  |  |  |  |  |  |
Initial public offering shares price per share | $ 35.65 |  |  |  |  |  |  |  |  |
Underwriters discount and legal, accounting, and other expenses | 1.0 |  |  |  |  |  |  |  |  |
Secondary stock offering, shareholder shares to be sold (shares) |  |  |  |  |  |  |  |  |  | 8,563,172
Secondary stock offering, maximum number of additional shareholder shares to be sold for overallotment of shares (shares) |  |  |  |  |  |  |  |  |  | 1,284,475
Estimated stock offering expenses payable |  |  |  |  |  |  |  |  |  | $ 1.0

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