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Net Income Per Common Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Jun. 30, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  |  |  |  |  |  |  |  |  |  | 15,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Net income (loss) |  |  |  |  |  |  |  |  | $ 27,806 us-gaap_NetIncomeLoss | $ 68,069 us-gaap_NetIncomeLoss | $ 74,042 us-gaap_NetIncomeLoss
Preferred Stock Dividends |  |  |  |  |  |  |  |  | (9,176)us-gaap_PreferredStockDividendsIncomeStatementImpact | (7,902)us-gaap_PreferredStockDividendsIncomeStatementImpact | (2,036)us-gaap_PreferredStockDividendsIncomeStatementImpact
Net income to common shareholders | 1,379 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 28,572 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | (3,028)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 19,266 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | (6,921)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 29,442 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 18,381 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | (8,293)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 18,630 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 60,167 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 72,006 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Weighted average common shares - basic and diluted |  |  |  |  |  |  |  |  | 54,701,485 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 54,647,643 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 53,146,416 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted
Effect of dilutive instruments on net income |  |  |  |  |  |  |  |  | 0 us-gaap_DilutiveSecuritiesEffectOnBasicEarningsPerShareOther | 0 us-gaap_DilutiveSecuritiesEffectOnBasicEarningsPerShareOther | 0 us-gaap_DilutiveSecuritiesEffectOnBasicEarningsPerShareOther
Diluted net income to common shareholders |  |  |  |  |  |  |  |  | $ 18,630 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | $ 60,167 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | $ 72,006 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Effect of dilutive instruments on weighted average common shares |  |  |  |  |  |  |  |  | 0 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment | 0 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment | 0 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Diluted, Weighted Average Number Common Shares |  |  |  |  |  |  |  |  | 54,701,485 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 54,647,643 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 53,146,416 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net income per common share - basic and diluted | $ 0.03 us-gaap_EarningsPerShareBasicAndDiluted | $ 0.52 us-gaap_EarningsPerShareBasicAndDiluted | $ (0.06)us-gaap_EarningsPerShareBasicAndDiluted | $ 0.35 us-gaap_EarningsPerShareBasicAndDiluted | $ (0.13)us-gaap_EarningsPerShareBasicAndDiluted | $ 0.54 us-gaap_EarningsPerShareBasicAndDiluted | $ 0.34 us-gaap_EarningsPerShareBasicAndDiluted | $ (0.15)us-gaap_EarningsPerShareBasicAndDiluted | $ 0.34 us-gaap_EarningsPerShareBasicAndDiluted | $ 1.10 us-gaap_EarningsPerShareBasicAndDiluted | $ 1.35 us-gaap_EarningsPerShareBasicAndDiluted

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