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Consolidated Statements of Changes in Stockholders Equity (USD $) In Thousands, except Share data, unless otherwise specified | Total | Preferred Class A [Member] | Common Stock [Member] | Preferred Stock [Member] | Preferred Stock [Member] Preferred Class A [Member] | Common Stock [Member] | Common Stock [Member] | Additional Paid In Capital [Member] | Additional Paid In Capital [Member] Preferred Class A [Member] | Additional Paid In Capital [Member] Common Stock [Member] | Returned Earnings/ (Accumulated Deficit) [Member] | Accumulated Other Comprehensive Loss [Member]
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Beginning balance at Dec. 31, 2011 |  | $ 336,978 us-gaap_StockholdersEquity |  |  |  |  | $ 206 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | $ 336,209 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | $ 0 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 563 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Beginning balance, Shares at Dec. 31, 2011 |  |  |  |  |  |  | 20,561,032 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Capital increase related to Equity Incentive Plan |  | 2,845 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  |  |  |  |  |  | 2,845 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |
Issuance of restricted stock |  | 0 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross |  |  |  |  | 0 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Issuance of restricted stock, Shares |  |  |  |  |  |  | 11,080 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Issuance of stock |  |  | 86,250 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredClassAMember | 124,472 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  | 35 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  | 74 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 86,215 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 124,398 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Issuance of stock, Shares |  |  |  |  |  | 3,450,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  | 7,471,994 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Offering costs |  | (3,602)us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts |  |  |  |  |  |  | (3,602)us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |
Net income |  | 40,181 us-gaap_NetIncomeLoss |  |  |  |  |  |  |  |  |  | 40,181 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Change in other comprehensive income |  | (593)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent |  |  |  |  |  |  |  |  |  |  | (593)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Dividends on preferred stock |  | (3,079)us-gaap_DividendsPreferredStock |  |  |  |  |  |  |  |  |  | (3,079)us-gaap_DividendsPreferredStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Dividends on common stock |  | (36,528)us-gaap_DividendsCommonStock |  |  |  |  |  |  |  |  |  | (36,528)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Ending balance at Dec. 31, 2012 |  | 546,924 us-gaap_StockholdersEquity |  |  | 35 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  | 280 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 546,065 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 574 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (30)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Ending balance, Shares at Dec. 31, 2012 |  |  |  |  | 3,450,000 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  | 28,044,106 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Capital increase related to Equity Incentive Plan |  | 3,457 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  |  |  |  |  |  | 3,457 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |
Issuance of restricted stock | [1] |  |  |  |  |  | 0 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Issuance of restricted stock, Shares |  |  |  |  |  |  | 36,304 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Issuance of stock |  |  |  | 148,804 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  |  |  | 89 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 148,715 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Issuance of stock, Shares |  |  |  |  |  |  |  | 8,808,057 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Offering costs |  | (627)us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts |  |  |  |  |  |  | (627)us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |
Net income |  | 52,485 us-gaap_NetIncomeLoss |  |  |  |  |  |  |  |  |  | 52,485 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Change in other comprehensive income |  | (840)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent |  |  |  |  |  |  |  |  |  |  | (840)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Dividends on preferred stock |  | (7,440)us-gaap_DividendsPreferredStock |  |  |  |  |  |  |  |  |  | (7,440)us-gaap_DividendsPreferredStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Dividends on common stock |  | (59,807)us-gaap_DividendsCommonStock |  |  |  |  |  |  |  |  |  | (59,807)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Ending balance at Dec. 31, 2013 |  | 682,956 us-gaap_StockholdersEquity |  |  | 35 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  | 369 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 697,610 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | (14,188)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (870)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Ending balance, Shares at Dec. 31, 2013 |  |  |  |  | 3,450,000 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  | 36,888,467 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Capital increase related to Equity Incentive Plan |  | 698 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  |  |  |  | 2 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 696 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |
Issuance of restricted stock |  | 1 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross |  |  |  |  | 1 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Issuance of restricted stock, Shares |  |  |  |  |  |  | 65,698 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Issuance of stock |  |  |  | 158,693 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  |  |  | 97 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 158,596 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Issuance of stock, Shares |  |  |  |  |  |  | 240,277 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 9,706,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Offering costs |  | (312)us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts |  |  |  |  |  |  | (312)us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |
Convertible senior notes |  | 11,445 us-gaap_AdjustmentsToAdditionalPaidInCapitalConvertibleDebtWithConversionFeature |  |  |  |  |  |  | 11,445 us-gaap_AdjustmentsToAdditionalPaidInCapitalConvertibleDebtWithConversionFeature / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |
Net income |  | 82,739 us-gaap_NetIncomeLoss |  |  |  |  |  |  |  |  |  | 82,739 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Change in other comprehensive income |  | (2,115)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent |  |  |  |  |  |  |  |  |  |  | (2,115)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Dividends on preferred stock |  | (7,440)us-gaap_DividendsPreferredStock |  |  |  |  |  |  |  |  |  | (7,440)us-gaap_DividendsPreferredStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Dividends on common stock |  | (71,596)us-gaap_DividendsCommonStock |  |  |  |  |  |  |  |  |  | (71,596)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Ending balance at Dec. 31, 2014 |  | $ 855,069 us-gaap_StockholdersEquity |  |  | $ 35 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  | $ 469 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | $ 868,035 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | $ (10,485)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (2,985)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Ending balance, Shares at Dec. 31, 2014 |  |  |  |  | 3,450,000 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  | 46,900,442 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
[1] | Rounds to zero.

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