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Note 13 - Segment and Geographical Information (Details) - Reconciliation of Segment Profit to the Consolidated Statement of Comprehensive Loss (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Reconciliation of Segment Profit to the Consolidated Statement of Comprehensive Loss [Abstract]    
Segment Profit $ 31,952exam_SegmentProfit $ 28,010exam_SegmentProfit
Depreciation and amortization (14,848)us-gaap_DepreciationAndAmortization (14,342)us-gaap_DepreciationAndAmortization
Share-based compensation expense (6,136)us-gaap_ShareBasedCompensation (5,353)us-gaap_ShareBasedCompensation
Acquisition related transaction costs 382us-gaap_BusinessCombinationAcquisitionRelatedCosts (1,192)us-gaap_BusinessCombinationAcquisitionRelatedCosts
Other expenses (210)exam_ExamOtherExpenses  
Income from operations $ 11,140us-gaap_OperatingIncomeLoss $ 7,123us-gaap_OperatingIncomeLoss