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Equity (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Equity activity    
Beginning balance $ 660,121us-gaap_StockholdersEquity  
Net income 17,552us-gaap_NetIncomeLoss 17,004us-gaap_NetIncomeLoss
Vesting of stock option and restricted common stock 982us-gaap_ShareBasedCompensation 666us-gaap_ShareBasedCompensation
Reclassification adjustment (9)us-gaap_OtherComprehensiveIncomeLossNetOfTax (9)us-gaap_OtherComprehensiveIncomeLossNetOfTax
Preferred stock dividends (818)us-gaap_DividendsPreferredStockCash  
Common stock dividends (18,116)us-gaap_DividendsCommonStockCash  
Other (328)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation  
Ending balance $ 659,384us-gaap_StockholdersEquity