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Consolidated Statements of Changes in Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated other comprehensive loss	$ (12,752)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax	$ (6,677)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax	$ 1,443us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax	$ 678us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Treasury Stock, Shares	19,866,000us-gaap_TreasuryStockShares	15,605,000us-gaap_TreasuryStockShares	12,605,000us-gaap_TreasuryStockShares	12,605,000us-gaap_TreasuryStockShares
Treasury Stock, Value	(376,942)us-gaap_TreasuryStockValue	(234,715)us-gaap_TreasuryStockValue	(132,543)us-gaap_TreasuryStockValue	132,543us-gaap_TreasuryStockValue
Non-controlling interests	274us-gaap_MinorityInterest	323us-gaap_MinorityInterest	(180)us-gaap_MinorityInterest	(118)us-gaap_MinorityInterest
Common stock – $.0001 par value, 135,000 shares authorized, 83,491 and 82,941 shares issued, 63,625 and 67,336 shares outstanding	6us-gaap_CommonStockValue	7us-gaap_CommonStockValue	5us-gaap_CommonStockValue	5us-gaap_CommonStockValue
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (in Shares)	340,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised	563,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised	874,500us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Exercise of stock options	4,943us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised		9,271us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Tax benefit from exercise of options	2,978us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation		4,608us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation
Tax Benefit from Stock Based Compensation	2,978us-gaap_DeferredTaxExpenseFromStockOptionsExercised	4,277us-gaap_DeferredTaxExpenseFromStockOptionsExercised	4,608us-gaap_DeferredTaxExpenseFromStockOptionsExercised
Issuance of fully vested restricted stock (in Shares)	210,000us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures	582,000us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures
Stock-based compensation	19,260us-gaap_ShareBasedCompensation	20,141us-gaap_ShareBasedCompensation	17,434us-gaap_ShareBasedCompensation
Unrealized holding gain on marketable securities net of taxes	1,441us-gaap_MarketableSecuritiesUnrealizedGainLoss		699us-gaap_MarketableSecuritiesUnrealizedGainLoss
Unrealized Gain (Loss) on Cash Flow Hedging Instruments	(1,278)us-gaap_UnrealizedGainLossOnCashFlowHedgingInstruments		87us-gaap_UnrealizedGainLossOnCashFlowHedgingInstruments
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(946)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	(775)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
Noncontrolling Interest in Operating Partnerships	148us-gaap_MinorityInterestInOperatingPartnerships
Noncontrolling Interest, Increase from Business Combination	128us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination
Net loss attributable to noncontrolling interests	749us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	1,278us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	(62)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Foreign currency translation adjustment	(6,238)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax		(21)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Net income	112,629us-gaap_ProfitLoss	133,285us-gaap_ProfitLoss	119,564us-gaap_ProfitLoss
Balance (in Shares)	63,625,000us-gaap_SharesOutstanding	67,336,000us-gaap_SharesOutstanding
Balance	669,529us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	678,840us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	626,400us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	474,758us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Additional paid-in capital	275,039us-gaap_AdditionalPaidInCapital	247,858us-gaap_AdditionalPaidInCapital	217,638us-gaap_AdditionalPaidInCapital	186,325us-gaap_AdditionalPaidInCapital
Retained earnings	783,904us-gaap_RetainedEarningsAccumulatedDeficit	672,044us-gaap_RetainedEarningsAccumulatedDeficit	540,037us-gaap_RetainedEarningsAccumulatedDeficit	420,411us-gaap_RetainedEarningsAccumulatedDeficit
Stock Repurchased During Period, Shares	(4,261,000)us-gaap_StockRepurchasedDuringPeriodShares
Payments for Repurchase of Common Stock	(142,228)us-gaap_PaymentsForRepurchaseOfCommonStock	(102,172)us-gaap_PaymentsForRepurchaseOfCommonStock	0us-gaap_PaymentsForRepurchaseOfCommonStock
Noncontrolling Interest in Operating Partnerships	(20)us-gaap_OtherMinorityInterests
Payments for Repurchase of Common Stock	1us-gaap_TreasuryStockValueAcquiredParValueMethod
Common Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (in Shares)		563,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	874,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Exercise of stock options		2us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	0us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Issuance of fully vested restricted stock (in Shares)			3,809,000us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures			0us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Balance (in Shares)			69,191,000us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	64,508,000us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Stock Repurchased During Period, Shares		3,000,000us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Additional Paid-in Capital [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options		5,802us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	9,271us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Tax benefit from exercise of options		4,277us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	4,608us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures			0us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Stock-based compensation		20,141us-gaap_ShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	17,434us-gaap_ShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Retained Earnings [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options			0us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures			0us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Net income	111,880us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	132,007us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	119,626us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Accumulated Other Comprehensive Income (Loss) [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Unrealized holding gain on marketable securities net of taxes		(3,468)us-gaap_MarketableSecuritiesUnrealizedGainLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember	699us-gaap_MarketableSecuritiesUnrealizedGainLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Unrealized Gain (Loss) on Cash Flow Hedging Instruments		(370)us-gaap_UnrealizedGainLossOnCashFlowHedgingInstruments / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Foreign currency translation adjustment		(4,282)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember	(21)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Stockholders' Equity, Total [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options		5,804us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_StockholdersEquityTotalMember
Tax benefit from exercise of options		4,277us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_StockholdersEquityTotalMember
Stock-based compensation		20,141us-gaap_ShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_StockholdersEquityTotalMember
Unrealized holding gain on marketable securities net of taxes		(3,468)us-gaap_MarketableSecuritiesUnrealizedGainLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_StockholdersEquityTotalMember
Unrealized Gain (Loss) on Cash Flow Hedging Instruments		(370)us-gaap_UnrealizedGainLossOnCashFlowHedgingInstruments / us-gaap_StatementEquityComponentsAxis = us-gaap_StockholdersEquityTotalMember
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders		(775)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / us-gaap_StatementEquityComponentsAxis = us-gaap_StockholdersEquityTotalMember
Foreign currency translation adjustment		(4,282)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_StockholdersEquityTotalMember
Net income		133,285us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_StockholdersEquityTotalMember
Balance	669,529us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_StockholdersEquityTotalMember	678,840us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_StockholdersEquityTotalMember
Payments for Repurchase of Common Stock		(102,172)us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_StockholdersEquityTotalMember
Treasury Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Repurchased During Period, Shares		(3,000,000)us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Payments for Repurchase of Common Stock	$ (142,227)us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember	$ (102,172)us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock.

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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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Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.

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The aggregate net change in the difference between the fair value and the carrying value, or in the comparative fair values, of marketable securities categorized as trading held at each balance sheet date, that was included in earnings for the period, which may have arisen from (a) securities classified as trading, (b) the unrealized holding gain (loss) on held-to-maturity securities transferred to the trading security category, and (c) the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) on available-for-sale securities transferred to trading securities during the period.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest).

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Carrying amount of equity interests owned by noncontrolling shareholders, partners, or other equity holders in one or more of the entities consolidated into the reporting entity's financial statements other than joint ventures, limited partnerships, operating partnerships or interests held by preferred unit holders.

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