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PROPERTY AND EQUIPMENT (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Property and equipment      
Property and equipment, gross $ 19,340us-gaap_PropertyPlantAndEquipmentGross $ 17,308us-gaap_PropertyPlantAndEquipmentGross  
Accumulated depreciation (6,190)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (4,930)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment  
Property and equipment, net 13,150us-gaap_PropertyPlantAndEquipmentNet 12,378us-gaap_PropertyPlantAndEquipmentNet  
Depreciation expense 1,474us-gaap_Depreciation 1,365us-gaap_Depreciation 1,798us-gaap_Depreciation
Land      
Property and equipment      
Property and equipment, gross 332us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
332us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
 
Buildings      
Property and equipment      
Property and equipment, gross 8,362us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
7,419us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
 
Buildings | Maximum      
Property and equipment      
Useful Life 40 years    
Building and leasehold improvements      
Property and equipment      
Property and equipment, gross 760us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= dplo_BuildingAndLeaseholdImprovementsMember
889us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= dplo_BuildingAndLeaseholdImprovementsMember
 
Building and leasehold improvements | Minimum      
Property and equipment      
Useful Life 5 years    
Building and leasehold improvements | Maximum      
Property and equipment      
Useful Life 15 years    
Equipment and fixtures      
Property and equipment      
Property and equipment, gross 7,221us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= dplo_EquipmentAndFixturesMember
6,572us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= dplo_EquipmentAndFixturesMember
 
Equipment and fixtures | Minimum      
Property and equipment      
Useful Life 5 years    
Equipment and fixtures | Maximum      
Property and equipment      
Useful Life 10 years    
Computer equipment      
Property and equipment      
Property and equipment, gross 2,665us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ComputerEquipmentMember
2,096us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ComputerEquipmentMember
 
Computer equipment | Minimum      
Property and equipment      
Useful Life 3 years    
Computer equipment | Maximum      
Property and equipment      
Useful Life 5 years    
Assets held-for-sale      
Property and equipment      
Carrying value of properties held for sale   300us-gaap_DisposalGroupIncludingDiscontinuedOperationLongLivedAssets
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_AssetsHeldForSaleMember
1,232us-gaap_DisposalGroupIncludingDiscontinuedOperationLongLivedAssets
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_AssetsHeldForSaleMember
Impairment loss   932us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_AssetsHeldForSaleMember
 
Gain (loss) on sale of assets $ 0us-gaap_GainLossOnDispositionOfAssets1
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_AssetsHeldForSaleMember