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Selected Quarterly Financial Data (Unaudited) Selected Quarterly Financial Data (Unaudited) (Quarterly Financial Information - 2013) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Selected Quarterly Financial Data [Abstract]                      
Net revenues $ 45,735us-gaap_Revenues $ 44,478us-gaap_Revenues $ 44,160us-gaap_Revenues $ 43,136us-gaap_Revenues $ 32,790us-gaap_Revenues $ 30,845us-gaap_Revenues $ 27,089us-gaap_Revenues $ 27,104us-gaap_Revenues $ 177,509us-gaap_Revenues $ 117,828us-gaap_Revenues $ 93,317us-gaap_Revenues
Investment and other gains 0us-gaap_RealizedInvestmentGainsLosses 0us-gaap_RealizedInvestmentGainsLosses 0us-gaap_RealizedInvestmentGainsLosses 0us-gaap_RealizedInvestmentGainsLosses 3,267us-gaap_RealizedInvestmentGainsLosses 3us-gaap_RealizedInvestmentGainsLosses 14us-gaap_RealizedInvestmentGainsLosses 22us-gaap_RealizedInvestmentGainsLosses      
Income from continuing operations attributable to common stockholders 27,532us-gaap_IncomeLossFromContinuingOperations 25,250us-gaap_IncomeLossFromContinuingOperations 25,294us-gaap_IncomeLossFromContinuingOperations 23,533us-gaap_IncomeLossFromContinuingOperations 24,114us-gaap_IncomeLossFromContinuingOperations 22,035us-gaap_IncomeLossFromContinuingOperations 18,300us-gaap_IncomeLossFromContinuingOperations 14,050us-gaap_IncomeLossFromContinuingOperations 101,609us-gaap_IncomeLossFromContinuingOperations 78,499us-gaap_IncomeLossFromContinuingOperations 72,667us-gaap_IncomeLossFromContinuingOperations
Discontinued operations 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity 3,661us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity 20,709us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity 1,621us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity 1,693us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity      
Net income attributable to common stockholders $ 27,532us-gaap_NetIncomeLoss $ 25,250us-gaap_NetIncomeLoss $ 25,294us-gaap_NetIncomeLoss $ 23,533us-gaap_NetIncomeLoss $ 27,775us-gaap_NetIncomeLoss $ 42,744us-gaap_NetIncomeLoss $ 19,921us-gaap_NetIncomeLoss $ 15,743us-gaap_NetIncomeLoss $ 101,609us-gaap_NetIncomeLoss $ 106,183us-gaap_NetIncomeLoss $ 90,731us-gaap_NetIncomeLoss
Weighted average common shares outstanding:                      
Basic 34,343,706us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 33,055,992us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 33,052,750us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 33,051,415us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 29,831,176us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 27,876,176us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 27,876,176us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 27,876,176us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 33,375,966us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 28,362,398us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 27,811,813us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted 34,402,969us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 33,088,570us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 33,087,283us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 33,085,232us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 29,860,614us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 27,905,545us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 27,913,727us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 27,911,584us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 33,416,014us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 28,397,702us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 27,838,720us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic:                      
Income from continuing operations attributable to common stockholders $ 0.80us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.76us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.77us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.71us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.81us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.79us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.65us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.50us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 3.04us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 2.77us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 2.61us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Discontinued operations $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ 0.12us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ 0.74us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ 0.06us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ 0.06us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ 0.97us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ 0.65us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Net income per common share attributable to common stockholders $ 0.80us-gaap_EarningsPerShareBasic $ 0.76us-gaap_EarningsPerShareBasic $ 0.77us-gaap_EarningsPerShareBasic $ 0.71us-gaap_EarningsPerShareBasic $ 0.93us-gaap_EarningsPerShareBasic $ 1.53us-gaap_EarningsPerShareBasic $ 0.71us-gaap_EarningsPerShareBasic $ 0.56us-gaap_EarningsPerShareBasic $ 3.04us-gaap_EarningsPerShareBasic $ 3.74us-gaap_EarningsPerShareBasic $ 3.26us-gaap_EarningsPerShareBasic
Diluted:                      
Income from continuing operations attributable to common stockholders $ 0.80us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.76us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.76us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.71us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.81us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.79us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.65us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.50us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 3.04us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 2.77us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 2.61us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Discontinued operations $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ 0.12us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ 0.74us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ 0.06us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ 0.06us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ 0.97us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ 0.65us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
Net income per common share attributable to common stockholders $ 0.80us-gaap_EarningsPerShareDiluted $ 0.76us-gaap_EarningsPerShareDiluted $ 0.76us-gaap_EarningsPerShareDiluted $ 0.71us-gaap_EarningsPerShareDiluted $ 0.93us-gaap_EarningsPerShareDiluted $ 1.53us-gaap_EarningsPerShareDiluted $ 0.71us-gaap_EarningsPerShareDiluted $ 0.56us-gaap_EarningsPerShareDiluted $ 3.04us-gaap_EarningsPerShareDiluted $ 3.74us-gaap_EarningsPerShareDiluted $ 3.26us-gaap_EarningsPerShareDiluted