Consolidated Statements Of Income (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues:
Revenues	$ 599,030us-gaap_Revenues	$ 520,801us-gaap_Revenues	$ 371,396us-gaap_Revenues
Cost of revenues (including share-based compensation of $345, $756 and $844 in 2014, 2013 and 2012, respectively)	105,989us-gaap_CostOfGoodsSoldSubscription	86,893us-gaap_CostOfGoodsSoldSubscription	67,013us-gaap_CostOfGoodsSoldSubscription
Gross profit	493,041us-gaap_GrossProfit	433,908us-gaap_GrossProfit	304,383us-gaap_GrossProfit
Operating expenses:
Sales and marketing (including share-based compensation of $1,944, $1,855 and $1,543 in 2014, 2013 and 2012, respectively)	141,967us-gaap_SellingAndMarketingExpense	131,317us-gaap_SellingAndMarketingExpense	62,825us-gaap_SellingAndMarketingExpense
Research, development and engineering (including share-based compensation of $721, $434 and $459 in 2014, 2013 and 2012, respectively)	30,680us-gaap_ResearchAndDevelopmentExpense	25,485us-gaap_ResearchAndDevelopmentExpense	18,624us-gaap_ResearchAndDevelopmentExpense
General and administrative (including share-based compensation of $5,898, $6,675, $6,286 in 2014, 2013 and 2012, respectively)	134,188us-gaap_GeneralAndAdministrativeExpense	101,683us-gaap_GeneralAndAdministrativeExpense	60,772us-gaap_GeneralAndAdministrativeExpense
Total operating expenses	306,835us-gaap_OperatingExpenses	258,485us-gaap_OperatingExpenses	142,221us-gaap_OperatingExpenses
Operating earnings	186,206us-gaap_OperatingIncomeLoss	175,423us-gaap_OperatingIncomeLoss	162,162us-gaap_OperatingIncomeLoss
Interest expense (income), net	31,204us-gaap_InterestIncomeExpenseNet	21,254us-gaap_InterestIncomeExpenseNet	7,650us-gaap_InterestIncomeExpenseNet
Other expense (income), net	(165)us-gaap_OtherNonoperatingIncomeExpense	11,472us-gaap_OtherNonoperatingIncomeExpense	(410)us-gaap_OtherNonoperatingIncomeExpense
Income before income taxes	155,167	142,697	154,922
Income tax expense	29,840us-gaap_IncomeTaxExpenseBenefit	35,175us-gaap_IncomeTaxExpenseBenefit	33,259us-gaap_IncomeTaxExpenseBenefit
Net earnings attributable to j2 Global, Inc. common shareholders	124,336us-gaap_NetIncomeLoss	107,522us-gaap_NetIncomeLoss	121,580us-gaap_NetIncomeLoss
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	125,327us-gaap_ProfitLoss	107,522us-gaap_ProfitLoss	121,663us-gaap_ProfitLoss
Net Income (Loss) Attributable to Noncontrolling Interest	0	0	83
Preferred Stock Redemption Premium	$ (991)us-gaap_PreferredStockRedemptionPremium	$ 0us-gaap_PreferredStockRedemptionPremium	$ 0us-gaap_PreferredStockRedemptionPremium
Net earnings per common share:
Basic	$ 2.60us-gaap_EarningsPerShareBasic	$ 2.31us-gaap_EarningsPerShareBasic	$ 2.63us-gaap_EarningsPerShareBasic
Diluted	$ 2.58us-gaap_EarningsPerShareDiluted	$ 2.28us-gaap_EarningsPerShareDiluted	$ 2.61us-gaap_EarningsPerShareDiluted
Weighted average shares outstanding:
Basic	46,778,015	45,548,767	45,459,712
Diluted	47,106,538	46,140,019	45,781,658
Cash dividends paid per common share	$ 1.10	$ 0.98	$ 0.87

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