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Goodwill and Identifiable Intangible Assets, Net (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Identifiable Intangible Assets, Net      
Gross Book Value $ 82,925us-gaap_FiniteLivedIntangibleAssetsGross $ 73,504us-gaap_FiniteLivedIntangibleAssetsGross  
Accumulated Amortization (37,259)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization (36,121)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization  
Amortization expense 7,653us-gaap_AmortizationOfIntangibleAssets 7,132us-gaap_AmortizationOfIntangibleAssets 8,837us-gaap_AmortizationOfIntangibleAssets
Future amortization expense of identifiable intangible assets      
2015 7,131us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths    
2016 5,492us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo    
2017 4,340us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree    
2018 3,550us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour    
2019 3,076us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive    
Thereafter 22,077us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive    
Total 45,666us-gaap_FiniteLivedIntangibleAssetsNet    
Customer relationships      
Identifiable Intangible Assets, Net      
Gross Book Value 50,440us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
40,404us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
 
Accumulated Amortization (26,287)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
(20,978)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
 
Customer relationships | Minimum      
Identifiable Intangible Assets, Net      
Estimated Useful Lives in Years 2 years    
Customer relationships | Maximum      
Identifiable Intangible Assets, Net      
Estimated Useful Lives in Years 15 years    
Backlog      
Identifiable Intangible Assets, Net      
Gross Book Value 1,600us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OrderOrProductionBacklogMember
6,515us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OrderOrProductionBacklogMember
 
Accumulated Amortization (829)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OrderOrProductionBacklogMember
(6,515)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OrderOrProductionBacklogMember
 
Backlog | Minimum      
Identifiable Intangible Assets, Net      
Estimated Useful Lives in Years 1 year    
Backlog | Maximum      
Identifiable Intangible Assets, Net      
Estimated Useful Lives in Years 2 years    
Noncompete agreements      
Identifiable Intangible Assets, Net      
Gross Book Value 2,890us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
2,890us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
 
Accumulated Amortization (2,868)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
(2,649)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
 
Noncompete agreements | Minimum      
Identifiable Intangible Assets, Net      
Estimated Useful Lives in Years 2 years    
Noncompete agreements | Maximum      
Identifiable Intangible Assets, Net      
Estimated Useful Lives in Years 7 years    
Tradenames      
Identifiable Intangible Assets, Net      
Gross Book Value 27,995us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
23,695us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
 
Accumulated Amortization $ (7,275)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
$ (5,979)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
 
Tradenames | Minimum      
Identifiable Intangible Assets, Net      
Estimated Useful Lives in Years 2 years    
Tradenames | Maximum      
Identifiable Intangible Assets, Net      
Estimated Useful Lives in Years 25 years