| **Stock Repurchase Program (Details) - USD ($)**                                             |               | 9 Months Ended |        |               |
|----------------------------------------------------------------------------------------------|---------------|----------------|--------|---------------|
||
| **Equity, Class of Treasury Stock [Line Items]**                                             |          |           |   |          |   |
| Stock Repurchase Program, Remaining Authorized Repurchase Amount                             |          | $ 5,700,000    |   |          |   |
| Payments for Repurchase of Common Stock                                                      |          | $ 304,924,000  | $ 0    |          |   |
| Subsequent Event                                                                             |          |           |   |          |   |
| **Equity, Class of Treasury Stock [Line Items]**                                             |          |           |   |          |   |
| Stock Repurchase Program, Authorized Amount                                                  |          |           |   | $ 200,000,000 |   |
| Stock Repurchase Program, Remaining Authorized Repurchase Amount                             |          |           |   | $ 205,700,000 |   |
| August 2015 Share Repurchase                                                                 |          |           |   |          |   |
| **Equity, Class of Treasury Stock [Line Items]**                                             |          |           |   |          |   |
| Stock Repurchase Program, Authorized Amount                                                  |          |           |   |          | $ 300,000,000.0 |
| Stock Repurchased During Period, Shares                                                      |          | 16,982,739     |   |          |   |
| August 2015 Share Repurchase Pursuant To Tender Offer                                        |          |           |   |          |   |
| **Equity, Class of Treasury Stock [Line Items]**                                             |          |           |   |          |   |
| Treasury Stock Acquired, Average Cost Per Share (in dollars per share)                       | $ 18.00       |           |   |          |   |
| Stock Repurchased During Period, Shares                                                      | 16,348,143    |           |   |          |   |
| Payments for Repurchase of Common Stock                                                      | $ 294,300,000 |           |   |          |   |
| August 2015 Share Repurchase Pursuant To Tender Offer | Fairholme Capital Management, L.L.C. |          |           |   |          |   |
| **Equity, Class of Treasury Stock [Line Items]**                                             |          |           |   |          |   |
| Stock Repurchased During Period, Shares                                                      | 100,000       |           |   |          |   |
| Previous Stock Repurchase Program                                                            |          |           |   |          |   |
| **Equity, Class of Treasury Stock [Line Items]**                                             |          |           |   |          |   |
| Stock Repurchase Program, Remaining Authorized Repurchase Amount                             |          |           |   |          | $ 93,600,000 |
| Treasury Stock Acquired, Average Cost Per Share (in dollars per share)                       |          | $ 16.03        |   |          |   |
| Stock Repurchased During Period, Shares                                                      |          | 634,596        |   |          |   |

| X                                                                                                                                                                                                                                                                                                                                                                                                                           |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash outflow to reacquire common stock during the period.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228
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| X                                                                                                                                                                                                                                                                               |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of stock repurchase plan authorized.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                              |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount remaining of a stock repurchase plan authorized.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Total cost of shares repurchased divided by the total number of shares repurchased.
+ References
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| X                                                                                                                                                               |
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