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Share-Based Compensation (Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding and Exercisable) (Details) (Stock Options and Stock Appreciation Rights (SARs), USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Stock Options and Stock Appreciation Rights (SARs)
 
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Outstanding, December 31, 2014 271avca_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardsOutstandingNumber
/ us-gaap_AwardTypeAxis
= avca_StockOptionsAndStockAppreciationRightsSarsMember
Granted 0avca_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= avca_StockOptionsAndStockAppreciationRightsSarsMember
Exercised (9)avca_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardsExercisesInPeriod
/ us-gaap_AwardTypeAxis
= avca_StockOptionsAndStockAppreciationRightsSarsMember
Expired or cancelled 0avca_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardsForfeituresAndExpirationsInPeriod
/ us-gaap_AwardTypeAxis
= avca_StockOptionsAndStockAppreciationRightsSarsMember
Outstanding, March 31, 2015 262avca_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardsOutstandingNumber
/ us-gaap_AwardTypeAxis
= avca_StockOptionsAndStockAppreciationRightsSarsMember
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]  
Outstanding, December 31, 2014 $ 6.67avca_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= avca_StockOptionsAndStockAppreciationRightsSarsMember
Granted $ 0.00avca_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= avca_StockOptionsAndStockAppreciationRightsSarsMember
Exercised $ 8.19avca_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= avca_StockOptionsAndStockAppreciationRightsSarsMember
Expired or cancelled $ 0.00avca_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= avca_StockOptionsAndStockAppreciationRightsSarsMember
Outstanding, March 31, 2015 $ 6.62avca_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= avca_StockOptionsAndStockAppreciationRightsSarsMember
Exercisable, shares 249avca_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardsExercisableNumber
/ us-gaap_AwardTypeAxis
= avca_StockOptionsAndStockAppreciationRightsSarsMember
Exercisable, Weighted Average Exercise Price $ 6.66avca_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardsExercisableWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= avca_StockOptionsAndStockAppreciationRightsSarsMember