Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Computation of Basic and Diluted Earnings Per Share
Net income, as reported	$ 15,729us-gaap_NetIncomeLoss	$ 197us-gaap_NetIncomeLoss
Less: net income attributable to participating securities	794	10
Net income available to common shareholders	$ 14,935	$ 187
Weighted average common shares	36,403,492	35,783,417
Basic and diluted net income per share	$ 0.41us-gaap_EarningsPerShareBasicAndDiluted	$ 0.01us-gaap_EarningsPerShareBasicAndDiluted
Number of unvested participating shares	1,934,858	1,841,949

This element represents nonvested share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid). Basic and dilutive earnings per share are generally disclosed for such shares using the two-class method.

+ References+ Details

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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+ Details