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Loss Per Share of Class A and Class B Common Stock Basic and Diluted Earnings Per Share, 2013, 2012 and 2011 (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Earnings Per Share, Basic [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  |  |  |  |  |  |  |  | $ (63,919,000)us-gaap_ProfitLoss |  | $ (88,946,000)us-gaap_ProfitLoss |  | $ (51,031,000)us-gaap_ProfitLoss |
Noncontrolling Interest, Change in Redemption Value |  |  |  |  |  |  |  |  |  | 0 us-gaap_MinorityInterestChangeInRedemptionValue |  | 0 us-gaap_MinorityInterestChangeInRedemptionValue |  | 12,604,000 us-gaap_MinorityInterestChangeInRedemptionValue |
Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  | 9,171,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest |  | 6,447,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest |  | 3,742,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest |
Net loss attributable to common stockholders | 11,384,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | (19,018,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | (20,922,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | (35,363,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | (78,861,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | [1] | (1,292,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | (5,551,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | (3,242,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | (73,090,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |  | (95,393,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |  | (67,377,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |
Basic, weighted average number of shares outstanding | 671,885,967 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 669,526,524 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 675,538,392 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 682,378,690 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 668,046,073 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 666,432,848 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 662,361,436 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 658,800,417 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 674,832,393 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 663,910,194 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 650,214,119 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |
Basic, net (loss) earnings per share | $ 0.01 us-gaap_EarningsPerShareBasic | $ (0.03)us-gaap_EarningsPerShareBasic | $ (0.03)us-gaap_EarningsPerShareBasic | $ (0.06)us-gaap_EarningsPerShareBasic | $ (0.12)us-gaap_EarningsPerShareBasic |  | $ 0.00 us-gaap_EarningsPerShareBasic | $ (0.01)us-gaap_EarningsPerShareBasic | $ (0.01)us-gaap_EarningsPerShareBasic | $ (0.11)us-gaap_EarningsPerShareBasic |  | $ (0.14)us-gaap_EarningsPerShareBasic |  | $ (0.10)us-gaap_EarningsPerShareBasic |
Earnings Per Share, Diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic, weighted average number of shares outstanding | 671,885,967 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 669,526,524 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 675,538,392 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 682,378,690 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 668,046,073 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 666,432,848 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 662,361,436 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 658,800,417 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 674,832,393 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 663,910,194 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 650,214,119 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |
Diluted, weighted average number of shares outstanding | 681,543,847 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 669,526,524 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 675,538,392 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 682,378,690 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 668,046,073 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 666,432,848 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 662,361,436 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 658,800,417 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 674,832,393 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 663,910,194 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 650,214,119 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |
Diluted, net (loss) earnings per share | $ 0.01 us-gaap_EarningsPerShareDiluted | $ (0.03)us-gaap_EarningsPerShareDiluted | $ (0.03)us-gaap_EarningsPerShareDiluted | $ (0.06)us-gaap_EarningsPerShareDiluted | $ (0.12)us-gaap_EarningsPerShareDiluted |  | $ 0.00 us-gaap_EarningsPerShareDiluted | $ (0.01)us-gaap_EarningsPerShareDiluted | $ (0.01)us-gaap_EarningsPerShareDiluted | $ (0.11)us-gaap_EarningsPerShareDiluted |  | $ (0.14)us-gaap_EarningsPerShareDiluted |  | $ (0.10)us-gaap_EarningsPerShareDiluted |
Common Class A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  |  |  |  |  |  |  |  | (63,691,000)us-gaap_ProfitLoss / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  | (88,626,000)us-gaap_ProfitLoss / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  | (50,842,000)us-gaap_ProfitLoss / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |
Noncontrolling Interest, Change in Redemption Value |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,557,000 us-gaap_MinorityInterestChangeInRedemptionValue / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |
Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  | 9,138,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  | 6,424,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  | 3,728,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |
Net loss attributable to common stockholders |  |  |  |  |  |  |  |  |  | (72,829,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  | (95,050,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  | (67,127,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |
Basic, weighted average number of shares outstanding |  |  |  |  |  |  |  |  |  | 672,432,417 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  | 661,510,218 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  | 647,814,143 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |
Basic, net (loss) earnings per share |  |  |  |  |  |  |  |  |  | $ (0.11)us-gaap_EarningsPerShareBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  | $ (0.14)us-gaap_EarningsPerShareBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  | $ (0.10)us-gaap_EarningsPerShareBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |
Earnings Per Share, Diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss) Available to Common Stockholders, Diluted |  |  |  |  |  |  |  |  |  | (72,829,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  | (95,050,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  | (67,127,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |
Reallocation of net income attributable to common stockholders as a result of conversion of Class B |  |  |  |  |  |  |  |  |  | 0 us-gaap_DilutiveSecuritiesEffectOnBasicEarningsPerShareOther / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | [2] | 0 us-gaap_DilutiveSecuritiesEffectOnBasicEarningsPerShareOther / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | [2] | 0 us-gaap_DilutiveSecuritiesEffectOnBasicEarningsPerShareOther / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | [2]
Allocation of net income attributable to common stockholders |  |  |  |  |  |  |  |  |  | (72,829,000)us-gaap_UndistributedEarningsDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  | (95,050,000)us-gaap_UndistributedEarningsDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  | (67,127,000)us-gaap_UndistributedEarningsDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |
Basic, weighted average number of shares outstanding |  |  |  |  |  |  |  |  |  | 672,432,417 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  | 661,510,218 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  | 647,814,143 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |
Conversion of Class B |  |  |  |  |  |  |  |  |  | 0 us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | [2] | 0 us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | [2] | 0 us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | [2]
Employee stock options |  |  |  |  |  |  |  |  |  | 0 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | [2] | 0 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | [2] | 0 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | [2]
Dilutive Securities, Effect on Basic Earnings Per Share, Options and Restrictive Stock Units |  |  |  |  |  |  |  |  |  | 0 us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | [2] | 0 us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | [2] | 0 us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | [2]
Diluted, weighted average number of shares outstanding |  |  |  |  |  |  |  |  |  | 672,432,417 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | [2] | 661,510,218 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | [2] | 647,814,143 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | [2]
Diluted, net (loss) earnings per share |  |  |  |  |  |  |  |  |  | $ (0.11)us-gaap_EarningsPerShareDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  | $ (0.14)us-gaap_EarningsPerShareDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  | $ (0.10)us-gaap_EarningsPerShareDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |
Common Class B [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  |  |  |  |  |  |  |  | (228,000)us-gaap_ProfitLoss / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  | (320,000)us-gaap_ProfitLoss / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  | (189,000)us-gaap_ProfitLoss / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |
Noncontrolling Interest, Change in Redemption Value |  |  |  |  |  |  |  |  |  |  |  |  |  | 47,000 us-gaap_MinorityInterestChangeInRedemptionValue / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |
Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  | 33,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  | 23,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  | 14,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |
Net loss attributable to common stockholders |  |  |  |  |  |  |  |  |  | (261,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  | (343,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  | (250,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |
Basic, weighted average number of shares outstanding |  |  |  |  |  |  |  |  |  | 2,399,976 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  | 2,399,976 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  | 2,399,976 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |
Basic, net (loss) earnings per share |  |  |  |  |  |  |  |  |  | $ (0.11)us-gaap_EarningsPerShareBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  | $ (0.14)us-gaap_EarningsPerShareBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  | $ (0.10)us-gaap_EarningsPerShareBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |
Earnings Per Share, Diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss) Available to Common Stockholders, Diluted |  |  |  |  |  |  |  |  |  | (261,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  | (343,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  | (250,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |
Reallocation of net income attributable to common stockholders as a result of conversion of Class B |  |  |  |  |  |  |  |  |  | 0 us-gaap_DilutiveSecuritiesEffectOnBasicEarningsPerShareOther / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | [2] | 0 us-gaap_DilutiveSecuritiesEffectOnBasicEarningsPerShareOther / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | [2] | 0 us-gaap_DilutiveSecuritiesEffectOnBasicEarningsPerShareOther / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | [2]
Allocation of net income attributable to common stockholders |  |  |  |  |  |  |  |  |  | (261,000)us-gaap_UndistributedEarningsDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  | (343,000)us-gaap_UndistributedEarningsDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  | (250,000)us-gaap_UndistributedEarningsDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |
Basic, weighted average number of shares outstanding |  |  |  |  |  |  |  |  |  | 2,399,976 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  | 2,399,976 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  | 2,399,976 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |
Conversion of Class B |  |  |  |  |  |  |  |  |  | 0 us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | [2] | 0 us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | [2] | 0 us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | [2]
Employee stock options |  |  |  |  |  |  |  |  |  | 0 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | [2] | 0 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | [2] | 0 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | [2]
Dilutive Securities, Effect on Basic Earnings Per Share, Options and Restrictive Stock Units |  |  |  |  |  |  |  |  |  | $ 0 us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | [2] | $ 0 us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | [2] | $ 0 us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | [2]
Diluted, weighted average number of shares outstanding |  |  |  |  |  |  |  |  |  | 2,399,976 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | [2] | 2,399,976 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | [2] | 2,399,976 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | [2]
Diluted, net (loss) earnings per share |  |  |  |  |  |  |  |  |  | $ (0.11)us-gaap_EarningsPerShareDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  | $ (0.14)us-gaap_EarningsPerShareDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  | $ (0.10)us-gaap_EarningsPerShareDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |
[1] | (1)Net loss and net loss attributable to Groupon, Inc. for the quarter ended December 31, 2013 included an impairment of the Company's investment in F-tuan of $85.5 million ($77.8 million, net of tax). See Note 6 "Investments."
[2] | Conversion of Class B shares into Class A shares and outstanding equity awards have not been reflected in the diluted loss per share calculation for the years ended December 31, 2014, 2013 and 2012 because the effect would be antidilutive.

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