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Share-Based Compensation - Stock Option Activity (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Stock option activity  
Options outstanding (in shares) 380,430us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Options exercised (in shares) (8,910)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Options forfeited (in shares) (3,160)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod
Options outstanding (in shares) 368,360us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Options vested or expected to vest (in shares) 364,495us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
Options exercisable (in shares) 302,780us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber
Stock option activity, weighted average exercise price  
Options Outstanding, weighted average exercise price (in dollars per share) $ 8.83us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Options exercised, weighted average exercise price (in dollars per share) $ 6.22us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
Options canceled, weighted average exercise price (in dollars per share) $ 8.81us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice
Options Outstanding, weighted average exercise price (in dollars per share) $ 8.89us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Options vested or expected to vest, weighted average exercise price (in dollars per share) $ 8.91us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice
Options exercisable, weighted average exercise price (in dollars per share) $ 9.19us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice
Options outstanding, weighted average remaining contractual term 3 years 8 months 4 days
Options vested or expected to vest, weighted average remaining contractual term 3 years 7 months 25 days
Options exercisable, weighted average remaining contractual term 2 years 10 months 25 days
Options outstanding, aggregate intrinsic value $ 1,081us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
Options vested or expected to vest, aggregate intrinsic value 1,067us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue
Options exercisable, aggregate intrinsic value $ 848us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue