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Net Income Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 24, 2014
Jun. 25, 2014
Mar. 26, 2014
Dec. 25, 2013
Sep. 25, 2013
Jun. 26, 2013
Mar. 27, 2013
Dec. 31, 2014
Dec. 25, 2013
Dec. 26, 2012
Earnings Per Share [Abstract]                      
Net income $ 9,678us-gaap_NetIncomeLoss $ 8,343us-gaap_NetIncomeLoss $ 8,273us-gaap_NetIncomeLoss $ 6,431us-gaap_NetIncomeLoss $ 4,262us-gaap_NetIncomeLoss $ 7,031us-gaap_NetIncomeLoss $ 6,198us-gaap_NetIncomeLoss $ 7,081us-gaap_NetIncomeLoss $ 32,725us-gaap_NetIncomeLoss $ 24,572us-gaap_NetIncomeLoss $ 22,309us-gaap_NetIncomeLoss
Weighted average shares outstanding - basic (in shares)                 86,323us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 90,829us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 94,949us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive share-based compensation awards                 2,032us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 2,074us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 1,805us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Weighted average shares outstanding - diluted (in shares)                 88,355us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 92,903us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 96,754us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic net income per share $ 0.11us-gaap_EarningsPerShareBasic [1] $ 0.10us-gaap_EarningsPerShareBasic [1] $ 0.10us-gaap_EarningsPerShareBasic [1] $ 0.07us-gaap_EarningsPerShareBasic [1] $ 0.05us-gaap_EarningsPerShareBasic [2] $ 0.08us-gaap_EarningsPerShareBasic [2] $ 0.07us-gaap_EarningsPerShareBasic [2] $ 0.08us-gaap_EarningsPerShareBasic [2] $ 0.38us-gaap_EarningsPerShareBasic $ 0.27us-gaap_EarningsPerShareBasic $ 0.23us-gaap_EarningsPerShareBasic
Diluted net income per share $ 0.11us-gaap_EarningsPerShareDiluted [1] $ 0.10us-gaap_EarningsPerShareDiluted [1] $ 0.09us-gaap_EarningsPerShareDiluted [1] $ 0.07us-gaap_EarningsPerShareDiluted [1] $ 0.05us-gaap_EarningsPerShareDiluted [2] $ 0.08us-gaap_EarningsPerShareDiluted [2] $ 0.07us-gaap_EarningsPerShareDiluted [2] $ 0.07us-gaap_EarningsPerShareDiluted [2] $ 0.37us-gaap_EarningsPerShareDiluted $ 0.26us-gaap_EarningsPerShareDiluted $ 0.23us-gaap_EarningsPerShareDiluted
Anti-dilutive share-based compensation awards (in shares)                 218us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 331us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 748us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
[1] Per share amounts do not necessarily sum to the total year amounts due to changes in shares outstanding and rounding
[2] Per share amounts do not necessarily sum to the total year amounts due to changes in shares outstanding and rounding.