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Restatement of Previously Issued Consolidated Financial Statements - Consolidated Statement of Changes in Equity Restated (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Net income | $ 67,012 | $ 65,662 | $ 127,498 | $ 114,571
As Reported [Member] |  |  |  |
Net income |  | 76,721 |  | 121,868
Restatement Adjustment [Member] |  |  |  |
Net income |  | $ (11,059) |  | $ (7,297)

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