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Stockholders' Equity (Details 3 )
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Reconciliation of the number of shares outstanding with the number of shares used in computing basic and diluted earnings per share      
Common shares outstanding, end of period 37,270,000fix_CommonStockSharesOutstandingExcludingUnvestedSharesContingentlyIssuable 37,578,000fix_CommonStockSharesOutstandingExcludingUnvestedSharesContingentlyIssuable 37,069,000fix_CommonStockSharesOutstandingExcludingUnvestedSharesContingentlyIssuable
Effect of using weighted average common shares outstanding 277,000fix_EffectOfUsingWeightedAverageCommonSharesOutstanding (333,000)fix_EffectOfUsingWeightedAverageCommonSharesOutstanding 43,000fix_EffectOfUsingWeightedAverageCommonSharesOutstanding
Shares used in computing earnings per share - basic 37,547,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 37,245,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 37,112,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of shares issuable under stock option plans based on the treasury stock method 147,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 183,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 87,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Effect of contingently issuable restricted shares 103,000us-gaap_IncrementalCommonSharesAttributableToContingentlyIssuableShares 108,000us-gaap_IncrementalCommonSharesAttributableToContingentlyIssuableShares 60,000us-gaap_IncrementalCommonSharesAttributableToContingentlyIssuableShares
Shares used in computing earnings per share - diluted 37,797,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 37,536,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 37,259,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Number of shares of unvested contingently issuable restricted stock outstanding   100,000fix_NumberOfUnvestedSharesContingentlyIssuableExcludedFromComputationOfBasicEarningsPerShare 200,000fix_NumberOfUnvestedSharesContingentlyIssuableExcludedFromComputationOfBasicEarningsPerShare