v2.4.1.9

Consolidated Statements of Shareholders' Equity (USD $) In Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Noncontrolling Interest [Member]
Beginning balance at Dec. 31, 2011	$ 471,682us-gaap_StockholdersEquity	$ 691us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	$ 573,950us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	$ 466,727us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	$ (439)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember	$ (569,247)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Beginning balance Treasury Stock, Shares at Dec. 31, 2011						23,570us-gaap_TreasuryStockShares / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Beginning balance in Shares at Dec. 31, 2011		69,118us-gaap_CommonStockSharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	271,804us-gaap_ProfitLoss
Noncontrolling Interest in Variable Interest Entity							0us-gaap_NoncontrollingInterestInVariableInterestEntity / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
NET INCOME	271,804us-gaap_NetIncomeLoss			271,804us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Other Comprehensive Income (Loss), Net of Tax	1,303us-gaap_OtherComprehensiveIncomeLossNetOfTax
Proceeds from Noncontrolling Interests	0us-gaap_ProceedsFromMinorityShareholders
Net Income (Loss) Attributable to Noncontrolling Interest	0us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Other-than-temporary impairment losses related to available for sale securities, net of income taxes of $65, $0, $0	0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities
Total Comprehensive Income	273,107us-gaap_ComprehensiveIncomeNetOfTax
Dividends		0us-gaap_Dividends / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	(789)us-gaap_Dividends / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	(79,296)us-gaap_Dividends / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Exercise of Common Stock options, shares		132us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Exercise of Common Stock options	(78,507)us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised	(2)us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	(2,109)us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures		209us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Issuance of Restricted Common Stock, net value	(2,111)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	(2)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	(4,389)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Tax benefit from exercise of stock options	(4,387)us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation		898us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Amortization of unearned compensation	898us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue		6,495us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Share-based Compensation	6,495us-gaap_ShareBasedCompensation
Treasury Stock, Shares, Acquired						4,839us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Convertible note hedge transactions, net of tax			6,495idcc_ConvertibleNoteHedgeTransactionsNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Issuance of Warrants during period			(152,694)us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Treasury Stock, Value, Acquired, Cost Method						(152,694)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Ending balance at Dec. 31, 2012	518,705us-gaap_StockholdersEquity	695us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	579,852us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	659,235us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	864us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember	(721,941)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Ending balance Treasury Stock, Shares at Dec. 31, 2012						28,409us-gaap_TreasuryStockShares / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Ending balance in Shares at Dec. 31, 2012		69,459us-gaap_CommonStockSharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	38,165us-gaap_ProfitLoss
Noncontrolling Interest in Variable Interest Entity	5,170us-gaap_NoncontrollingInterestInVariableInterestEntity						5,170us-gaap_NoncontrollingInterestInVariableInterestEntity / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
NET INCOME	35,683us-gaap_NetIncomeLoss
Other Comprehensive Income (Loss), Net of Tax	(878)us-gaap_OtherComprehensiveIncomeLossNetOfTax
Proceeds from Noncontrolling Interests	7,652us-gaap_ProceedsFromMinorityShareholders						7,652us-gaap_ProceedsFromMinorityShareholders / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Net Income (Loss) Attributable to Noncontrolling Interest	(2,482)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest						(2,482)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Other-than-temporary impairment losses related to available for sale securities, net of income taxes of $65, $0, $0	0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities
Total Comprehensive Income	34,805us-gaap_ComprehensiveIncomeNetOfTax
Dividends		0us-gaap_Dividends / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	(297)us-gaap_Dividends / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	16,682us-gaap_Dividends / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Exercise of Common Stock options, shares		49us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Exercise of Common Stock options	(16,385)us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised	0us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	(1,032)us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures		106us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Issuance of Restricted Common Stock, net value	(1,032)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	(1)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	(2,459)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Tax benefit from exercise of stock options	(2,458)us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation		815us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Amortization of unearned compensation	815us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue		15,940us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Share-based Compensation	15,940us-gaap_ShareBasedCompensation
Treasury Stock, Shares, Acquired						917us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Deferred financing costs allocated to equity			2,848us-gaap_AdjustmentsToAdditionalPaidInCapitalOther / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Treasury Stock, Value, Acquired, Cost Method						(29,134)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	533,820us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Ending balance at Dec. 31, 2013	528,650us-gaap_StockholdersEquity	696us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	598,325us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	680,718us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	(14)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember	(751,075)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Ending balance Treasury Stock, Shares at Dec. 31, 2013	29,326us-gaap_TreasuryStockShares					29,326us-gaap_TreasuryStockShares / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Ending balance in Shares at Dec. 31, 2013	69,614us-gaap_CommonStockSharesIssued	69,614us-gaap_CommonStockSharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	104,342us-gaap_ProfitLoss
Noncontrolling Interest in Variable Interest Entity	7,349us-gaap_NoncontrollingInterestInVariableInterestEntity						7,349us-gaap_NoncontrollingInterestInVariableInterestEntity / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
NET INCOME	101,420us-gaap_NetIncomeLoss
Other Comprehensive Income (Loss), Net of Tax	12us-gaap_OtherComprehensiveIncomeLossNetOfTax
Proceeds from Noncontrolling Interests	5,101us-gaap_ProceedsFromMinorityShareholders						5,101us-gaap_ProceedsFromMinorityShareholders / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Net Income (Loss) Attributable to Noncontrolling Interest	(2,922)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest						(2,922)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Other-than-temporary impairment losses related to available for sale securities, net of income taxes of $65, $0, $0	120us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities
Total Comprehensive Income	101,552us-gaap_ComprehensiveIncomeNetOfTax
Dividends			(857)us-gaap_Dividends / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	28,010us-gaap_Dividends / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Exercise of Common Stock options, shares	21us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised	21us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Exercise of Common Stock options	(27,153)us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised	0us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	(402)us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures		165us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Issuance of Restricted Common Stock, net value	(402)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	(2)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	(2,740)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Tax benefit from exercise of stock options	(2,738)us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation		(1,176)us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Amortization of unearned compensation	(1,176)us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue		18,494us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Share-based Compensation	18,494us-gaap_ShareBasedCompensation
Treasury Stock, Shares, Acquired						3,554us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Treasury Stock, Value, Acquired, Cost Method						(152,625)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	475,677us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Ending balance at Dec. 31, 2014	$ 468,328us-gaap_StockholdersEquity	$ 698us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	$ 614,162us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	$ 757,050us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	$ 118us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember	$ (903,700)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Ending balance Treasury Stock, Shares at Dec. 31, 2014	32,880us-gaap_TreasuryStockShares					32,880us-gaap_TreasuryStockShares / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Ending balance in Shares at Dec. 31, 2014	69,800us-gaap_CommonStockSharesIssued	69,800us-gaap_CommonStockSharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember

X

- Definition

Allocated portion of discount from the Notes to equity

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No definition available.

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- Definition

Amount of other increase (decrease) in additional paid in capital (APIC).

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- Definition

This element represents the amount of recognized equity-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). Alternate captions include the words "stock-based compensation".

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- Definition

Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit.

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Amount of increase in additional paid in capital (APIC) resulting from the issuance of warrants. Includes allocation of proceeds of debt securities issued with detachable stock purchase warrants.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount of paid and unpaid cash, stock, and paid-in-kind (PIK) dividends declared, for example, but not limited to, common and preferred stock.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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