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Quarterly Results of Operations - Textual (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]          
Foreign exchange loss $ 8,066us-gaap_ForeignCurrencyTransactionGainLossBeforeTax   $ 18,482us-gaap_ForeignCurrencyTransactionGainLossBeforeTax $ 5,516us-gaap_ForeignCurrencyTransactionGainLossBeforeTax $ 1,138us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Allocated share-based compensation expense, total   63,715us-gaap_ShareBasedCompensation 17,696us-gaap_ShareBasedCompensation 100,405us-gaap_ShareBasedCompensation 32,197us-gaap_ShareBasedCompensation
Effect of adjustments to estimated gross profit $ 1,751us-gaap_DeferredPolicyAcquisitionCostAmortizationExpenseEffectOfAdjustmentsToEstimatedGrossProfit $ 30,514us-gaap_DeferredPolicyAcquisitionCostAmortizationExpenseEffectOfAdjustmentsToEstimatedGrossProfit