ADTRAN (ADTN) 10-Q 7 May 14 2014 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2014	Apr. 23, 2014
Document And Entity Information [Abstract]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	31-Mar-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q1	'
Entity Registrant Name	'ADTRAN INC	'
Entity Central Index Key	'0000926282	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Large Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	56,417,196

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Current Assets	'	'
Cash and cash equivalents	$52,815	$58,298
Short-term investments	89,160	105,760
Accounts receivable, less allowance for doubtful accounts of $133 and $130 at March 31, 2014 and December 31, 2013, respectively	100,524	85,814
Other receivables	28,967	18,249
Inventory	87,396	90,111
Prepaid expenses	5,005	4,325
Deferred tax assets, net	15,181	17,083
Total Current Assets	379,048	379,640
Property, plant and equipment, net	75,885	76,739
Deferred tax assets, net	11,491	9,622
Goodwill	3,492	3,492
Other assets	11,933	11,180
Long-term investments	309,452	309,225
Total Assets	791,301	789,898
Current Liabilities	'	'
Accounts payable	59,097	48,282
Unearned revenue	27,533	22,205
Accrued expenses	10,683	12,776
Accrued wages and benefits	17,448	14,040
Income tax payable, net	5,272	5,002
Total Current Liabilities	120,033	102,305
Non-current unearned revenue	15,116	14,643
Other non-current liabilities	23,476	22,144
Bonds payable	30,000	46,200
Total Liabilities	188,625	185,292
Commitments and contingencies (see Note 14)	'	'
Stockholders' Equity	'	'
Common stock, par value $0.01 per share; 200,000 shares authorized; 79,652 shares issued and 56,646 shares outstanding at March 31, 2014 and 79,652 shares issued and 56,918 shares outstanding at December 31, 2013	797	797
Additional paid-in capital	235,624	233,511
Accumulated other comprehensive income	10,084	10,753
Retained earnings	888,121	884,451
Less treasury stock at cost: 23,006 and 22,734 shares at March 31, 2014 and December 31, 2013, respectively	-531,950	-524,906
Total Stockholders' Equity	602,676	604,606
Total Liabilities and Stockholders' Equity	$791,301	$789,898

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, except Per Share data, unless otherwise specified
Statement Of Financial Position [Abstract]	'	'
Allowance for doubtful accounts	$133	$130
Common stock, par value	$0.01	$0.01
Common stock, shares authorized	200,000	200,000
Common stock, shares issued	79,652	79,652
Common stock, shares outstanding	56,646	56,918
Treasury stock, shares	23,006	22,734

Consolidated_Statements_of_Inc

Consolidated Statements of Income (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Income Statement [Abstract]	'	'
Sales	$147,004	$143,013
Cost of sales	69,214	73,336
Gross Profit	77,790	69,677
Selling, general and administrative expenses	33,939	30,603
Research and development expenses	32,553	32,511
Operating Income	11,298	6,563
Interest and dividend income	1,294	1,768
Interest expense	-227	-581
Net realized investment gain	2,192	3,645
Other income (expense), net	122	-1,672
Income before provision for income taxes	14,679	9,723
Provision for income taxes	-5,072	-1,833
Net Income	$9,607	$7,890
Weighted average shares outstanding - basic	56,751	61,847
Weighted average shares outstanding - diluted	57,368	62,030
Earnings per common share - basic	$0.17	$0.13
Earnings per common share - diluted	$0.17	$0.13
Dividend per share	$0.09	$0.09

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Statement Of Income And Comprehensive Income [Abstract]	'	'
Net income	$9,607	$7,890
Other Comprehensive Loss, net of tax:	'	'
Net unrealized losses on available-for-sale securities	-921	-1,644
Foreign currency translation	252	323
Other Comprehensive Income (Loss), net of tax	-669	-1,321
Comprehensive Income, net of tax	$8,938	$6,569

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities:	'	'
Net income	$9,607	$7,890
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation and amortization	3,580	3,663
Amortization of net premium on available-for-sale investments	1,135	1,754
Net realized gain on long-term investments	-2,192	-3,645
Net (gain) loss on disposal of property, plant and equipment	-3	17
Stock-based compensation expense	2,057	2,232
Deferred income taxes	627	715
Tax benefit from stock option exercises	57	'
Excess tax benefits from stock-based compensation arrangements	-55	'
Changes in operating assets and liabilities:	'	'
Accounts receivable, net	-14,668	-1,306
Other receivables	-10,710	-224
Inventory	2,739	6,540
Prepaid expenses and other assets	-2,024	-217
Accounts payable	11,043	7,170
Accrued expenses and other liabilities	8,431	1,188
Income tax payable, net	275	379
Net cash provided by operating activities	9,899	26,156
Cash flows from investing activities:	'	'
Purchases of property, plant and equipment	-2,042	-643
Proceeds from disposals of property, plant and equipment	1	'
Proceeds from sales and maturities of available-for-sale investments	85,072	118,133
Purchases of available-for-sale investments	-69,182	-125,411
Net cash provided by (used in) investing activities	13,849	-7,921
Cash flows from financing activities:	'	'
Proceeds from stock option exercises	1,541	55
Purchases of treasury stock	-9,427	-22,546
Dividend payments	-5,102	-5,586
Payments on long-term debt	-16,500	'
Excess tax benefits from stock-based compensation arrangements	55	'
Net cash used in financing activities	-29,433	-28,077
Net decrease in cash and cash equivalents	-5,685	-9,842
Effect of exchange rate changes	202	25
Cash and cash equivalents, beginning of period	58,298	68,457
Cash and cash equivalents, end of period	52,815	58,640
Supplemental disclosure of non-cash investing activities	'	'
Purchases of property, plant and equipment included in accounts payable	$85	$92

Summary_of_Significant_Account

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2014
Accounting Policies [Abstract]	'
Summary of Significant Accounting Policies	'
	1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
	Basis of Presentation
	The accompanying unaudited consolidated financial statements of ADTRAN®, Inc. and its subsidiaries (ADTRAN) have been prepared pursuant to the rules and regulations for reporting on Quarterly Reports on Form 10-Q. Accordingly, certain information and notes required by generally accepted accounting principles for complete financial statements are not included herein. The December 31, 2013 Consolidated Balance Sheet is derived from audited financial statements, but does not include all disclosures required by accounting principles generally accepted in the United States.
	In the opinion of management, all adjustments necessary for a fair presentation of these interim statements have been recorded and are of a normal and recurring nature. The results of operations for an interim period are not necessarily indicative of the results for the full year. The interim statements should be read in conjunction with the financial statements and notes thereto included in ADTRAN’s Annual Report on Form 10-K for the year ended December 31, 2013, filed on February 27, 2014 with the SEC.
	Changes in Classifications
	We corrected immaterial misclassifications between the operating and investing sections of our consolidated statements of cash flows and adjusted our cash flows for the three months ended March 31, 2013 in these categories by $0.1 million in order to be consistent with the 2014 presentation.
	Out of Period Adjustment
	During the year ended December 31, 2013, we identified two adjustments in the acquired NSN (formerly Nokia Siemens Networks) Broadband Access business (NSN BBA business) relating to customer payment discounts for one customer, and recoverable VAT taxes on certain vendor freight invoices that should have been recorded in prior periods. These adjustments resulted from a $0.3 million understatement of net income in the first quarter of 2013. We evaluated the impact of the adjustments on the results of our previously issued financial statements for first quarter of 2013 and concluded that the impact was not material. We also evaluated the impact of the cumulative effect of the adjustments in 2013 and concluded that the impact was not material to our results for the year 2013. Accordingly, during the three months ended September 30, 2013 we recorded an out of period adjustment to correct these issues.
	Use of Estimates
	The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expense during the reporting period. Our more significant estimates include the obsolete and excess inventory reserves, warranty reserves, customer rebates, determination of the deferred revenue components of multiple element sales agreements, estimated costs to complete obligations associated with deferred revenues, estimated income tax provision and income tax contingencies, the fair value of stock-based compensation, impairment of goodwill, valuation and estimated lives of intangible assets, estimated working capital adjustments under negotiation related to the NSN BBA business acquisition, estimated pension liability, fair value of investments, and the evaluation of other-than-temporary declines in the value of investments. Actual amounts could differ significantly from these estimates.
	Recent Accounting Pronouncements
	During the three months ended March 31, 2014, no accounting pronouncements were issued that would have a material effect on our consolidated results of operations or financial condition.

Income_Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2014
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	2. INCOME TAXES
	Our effective tax rate increased from 18.9% in the three months ended March 31, 2013 to 34.6% in the three months ended March 31, 2014. The increase in the effective tax rate between the two periods is primarily attributable to the net effect of recording the benefit for the research tax credit for the 2012 tax year in January 2013 pursuant to the American Taxpayer Relief Act of 2012, and the inclusion of the benefit of the estimated 2013 research tax credit in the estimated annual effective rate for 2013. Additionally, the effective tax rate in the first quarter of 2014 did not include a benefit for the research tax credit, which expired on December 31, 2013. This increase was partially offset

Pension_Benefit_Plan

Pension Benefit Plan	3 Months Ended
	Mar. 31, 2014
Compensation And Retirement Disclosure [Abstract]	'
Pension Benefit Plan	'
	3. PENSION BENEFIT PLAN
	We maintain a defined benefit pension plan covering employees in certain foreign countries.
	The following table summarizes the components of net periodic pension cost for the three months ended March 31, 2014 and 2013:
		Three Months Ended
		March 31,
	(In thousands)	2014			2013
	Service cost	$	305		$	300
	Interest cost		215			187
	Expected return on plan assets		(279	)		(253	)
	Net periodic pension cost	$	241		$	234

StockBased_Compensation

Stock-Based Compensation	3 Months Ended
	Mar. 31, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Stock-Based Compensation	'
	4. STOCK-BASED COMPENSATION
	The following table summarizes the stock-based compensation expense related to stock options, restricted stock units (RSUs) and restricted stock for the three months ended March 31, 2014 and 2013, which was recognized as follows:
		Three Months Ended
		March 31,
	(In thousands)	2014			2013
	Stock-based compensation expense included in cost of sales	$	116		$	106
	Selling, general and administrative expense		1,026			1,063
	Research and development expense		915			1,063
	Stock-based compensation expense included in operating expenses		1,941			2,126
	Total stock-based compensation expense		2,057			2,232
	Tax benefit for expense associated with		(284	)		(307	)
	non-qualified options
	Total stock-based compensation expense, net of tax	$	1,773		$	1,925
	The fair value of our stock options was estimated using the Black-Scholes model. The determination of the fair value of stock options on the date of grant using the Black-Scholes model is affected by our stock price as well as assumptions regarding a number of complex and subjective variables that may have a significant impact on the fair value estimate.
	There were no options granted during the three months ended March 31, 2013. The weighted-average assumptions and value of options granted for the three months ended March 31, 2014 are summarized as follows:
		Three Months Ended
		March 31,
		2014
	Expected volatility		39.57	%
	Risk-free interest rate		1.86	%
	Expected dividend yield		1.38	%
	Expected life (in years)		6.25
	Weighted-average estimated value	$	9.28
	The fair value of our RSUs is calculated using a Monte Carlo Simulation valuation method. No RSUs were granted, forfeited, or vested during the three months ended March 31, 2014 or 2013.
	The fair value of restricted stock is equal to the closing price of our stock on the date of grant. No restricted stock was granted, forfeited, or vested during the three months ended March 31, 2014 or 2013.
	Stock-based compensation expense recognized in our Consolidated Statements of Income for the three months ended March 31, 2014 and 2013 is based on options, RSUs and restricted stock ultimately expected to vest, and has been reduced for estimated forfeitures. Estimated forfeitures for stock options were based upon historical experience and approximate 2.5% annually. We estimated a 0% forfeiture rate for our RSUs and restricted stock due to the limited number of recipients and historical experience for these awards.
	As of March 31, 2014, total compensation expense related to non-vested stock options, RSUs and restricted stock not yet recognized was approximately $16.4 million, which is expected to be recognized over an average remaining recognition period of 2.5 years.
	The following table is a summary of our stock options outstanding as of December 31, 2013 and March 31, 2014 and the changes that occurred during the three months ended March 31, 2014:
	(In thousands, except per share amounts)	Number of			Weighted Avg.			Weighted Avg.		Aggregate
		Options			Exercise Price			Remaining		Intrinsic
								Contractual		Value
								Life In Years
	Options outstanding, December 31, 2013		6,358		$	24.43			6.6	$	25,878
	Options granted		2		$	26.03
	Options cancelled/forfeited		(61	)	$	25.16
	Options exercised		(78	)	$	19.71
	Options outstanding, March 31, 2014		6,221		$	24.48			6.35	$	14,478
	Options exercisable, March 31, 2014		3,826		$	24.84			4.93	$	8,526
	The aggregate intrinsic values in the table above represent the total pre-tax intrinsic value (the difference between the closing price of our stock on the last trading day of the quarter and the exercise price, multiplied by the number of in-the-money options) that would have been received by the option holders had all option holders exercised their options on March 31, 2014. The aggregate intrinsic value will change based on the fair market value of our stock.
	The total pre-tax intrinsic value of options exercised during the three months ended March 31, 2014 was $0.5 million.

Investments

Investments	3 Months Ended
	Mar. 31, 2014
Investments Debt And Equity Securities [Abstract]	'
Investments	'
	5. INVESTMENTS
	At March 31, 2014, we held the following securities and investments, recorded at either fair value or cost.
	(In thousands)	Amortized			Gross Unrealized						Carrying
		Cost			Gains			Losses			Value
	Deferred compensation plan assets	$	12,523		$	2,770		$	(16	)	$	15,277
	Corporate bonds		130,437			456			(30	)		130,863
	Municipal fixed-rate bonds		157,851			673			(137	)		158,387
	Municipal variable rate demand notes		24,840			—			—			24,840
	Marketable equity securities		25,166			12,798			(378	)		37,586
	Available-for-sale securities held at fair value	$	350,817		$	16,697		$	(561	)	$	366,953
	Restricted investment held at cost											30,000
	Other investments held at cost											1,659
	Total carrying value of available-for-sale investments										$	398,612
	At December 31, 2013, we held the following securities and investments, recorded at either fair value or cost.
	(In thousands)	Amortized			Gross Unrealized						Carrying
		Cost			Gains			Losses			Value
	Deferred compensation plan assets	$	12,300		$	2,847		$	(24	)	$	15,123
	Corporate bonds		166,370			534			(45	)		166,859
	Municipal fixed-rate bonds		135,773			583			(54	)		136,302
	Municipal variable rate demand notes		8,310			—			—			8,310
	Marketable equity securities		24,654			13,975			(177	)		38,452
	Available-for-sale securities held at fair value	$	347,407		$	17,939		$	(300	)	$	365,046
	Restricted investment held at cost											48,250
	Other investments held at cost											1,689
	Total carrying value of available-for-sale investments										$	414,985
	As of March 31, 2014, our corporate bonds and municipal fixed-rate bonds had the following contractual maturities:
	(In thousands)	Corporate			Municipal
		bonds			fixed-rate
					bonds
	Less than one year	$	34,248		$	34,630
	One to two years		52,222			60,991
	Two to three years		44,393			47,713
	Three to five years		—			15,053
	Total	$	130,863		$	158,387
	Our investment policy provides limitations for issuer concentration, which limits, at the time of purchase, the concentration in any one issuer to 5% of the market value of our total investment portfolio.
	At March 31, 2014, we held a $30.0 million restricted certificate of deposit, which is carried at cost. This investment serves as a collateral deposit against the principal amount outstanding under loans made to ADTRAN pursuant to an Alabama State Industrial Development Authority revenue bond (the Bond). During the first quarter of 2014, we made a principal payment on the Bond of $16.5 million. At March 31, 2014, the estimated fair value of the Bond using a level 2 valuation technique was approximately $29.6 million, based on a debt security with a comparable interest rate and maturity and a Standard and Poor’s credit rating of AAA-. For more information on the Bond, see “Debt” under “Liquidity and Capital Resources” in the “Management’s Discussion and Analysis of Financial Condition and Results of Operations” contained in Item 2 of Part I of this report.
	We review our investment portfolio for potential “other-than-temporary” declines in value on an individual investment basis. We assess, on a quarterly basis, significant declines in value which may be considered other-than-temporary and, if necessary, recognize and record the appropriate charge to write-down the carrying value of such investments. In making this assessment, we take into consideration qualitative and quantitative information, including but not limited to the following: the magnitude and duration of historical declines in market prices, credit rating activity, assessments of liquidity, public filings, and statements made by the issuer. We generally begin our identification of potential other-than-temporary impairments by reviewing any security with a fair value that has declined from its original or adjusted cost basis by 25% or more for six or more consecutive months. We then evaluate the individual security based on the previously identified factors to determine the amount of the write-down, if any. As a result of our review, we recorded no other-than-temporary impairment charges during the three months ended March 31, 2014. For the three months ended March 31, 2013, we recorded an other-than-temporary impairment charge of $4 thousand related to one marketable equity security.
	Realized gains and losses on sales of securities are computed under the specific identification method. The following table presents gross realized gains and losses related to our investments.
		Three Months Ended
		March 31,
	(In thousands)	2014			2013
	Gross realized gains	$	2,228		$	3,727
	Gross realized losses	$	(36	)	$	(82	)
	As of March 31, 2014 and 2013, gross unrealized losses related to individual securities in a continuous loss position for 12 months or longer were not significant.
	We have categorized our cash equivalents held in money market funds and our investments held at fair value into a three-level fair value hierarchy based on the priority of the inputs to the valuation technique for the cash equivalents and investments as follows: Level 1—Values based on unadjusted quoted prices for identical assets or liabilities in an active market; Level 2—Values based on quoted prices in markets that are not active or model inputs that are observable either directly or indirectly; Level 3—Values based on prices or valuation techniques that require inputs that are both unobservable and significant to the overall fair value measurement. These inputs include information supplied by investees.
		Fair Value Measurements at March 31, 2014 Using
	(In thousands)	Fair Value			Quoted Prices			Significant			Significant
					in Active			Other			Unobservable
					Market for			Observable			Inputs
					Identical			Inputs			(Level 3)
					Assets			(Level 2)
					(Level 1)
	Cash equivalents
	Money market funds	$	11,742		$	11,742		$	—		$	—
	Available-for-sale securities
	Deferred compensation plan assets		15,277			15,277			—			—
	Available-for-sale debt securities
	Corporate bonds		130,863			—			130,863			—
	Municipal fixed-rate bonds		158,387			—			158,387			—
	Municipal variable rate demand notes		24,840			—			24,840			—
	Available-for-sale marketable equity securities
	Equity securities – technology industry		10,639			10,639			—			—
	Equity securities – other		26,947			26,947			—			—
Available-for-sale securities		366,953			52,863			314,090			—
Total	$	378,695		$	64,605		$	314,090		$	—
	Fair Value Measurements at December 31, 2013 Using
(In thousands)	Fair Value			Quoted Prices			Significant			Significant
				in Active			Other			Unobservable
				Market for			Observable			Inputs
				Identical			Inputs			(Level 3)
				Assets			(Level 2)
				(Level 1)
Cash equivalents
Money market funds	$	3,949		$	3,949		$	—		$	—
Available-for-sale securities
Deferred compensation plan assets		15,123			15,123			—			—
Available-for-sale debt securities
Corporate bonds		166,859			—			166,859			—
Municipal fixed-rate bonds		136,302			—			136,302			—
Municipal variable rate demand notes		8,310			—			8,310			—
Available-for-sale marketable equity securities
Equity securities – technology industry		11,398			11,398			—			—
Equity securities – other		27,054			27,054			—			—
Available-for-sale securities		365,046			53,575			311,471			—
Total	$	368,995		$	57,524		$	311,471		$	—
The fair value of our Level 2 securities is calculated using a weighted average market price for each security. Market prices are obtained from a variety of industry standard data providers, security master files from large financial institutions, and other third-party sources. These multiple market prices are used as inputs into a distribution-curve-based algorithm to determine the daily market value of each security.
Our municipal variable rate demand notes have a structure that implies a standard expected market price. The frequent interest rate resets make it reasonable to expect the price to stay at par. These securities are priced at the expected market price.

Derivative_Instruments_and_Hed

Derivative Instruments and Hedging Activities	3 Months Ended
	Mar. 31, 2014
Derivative Instruments And Hedging Activities Disclosure [Abstract]	'
Derivative Instruments and Hedging Activities	'
	6. DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES
	We have certain international customers who are billed in their local currency. Changes in the monetary exchange rates may adversely affect our results of operations and financial condition. When appropriate, we enter into various derivative transactions to enhance our ability to manage the volatility relating to these typical business exposures. We do not hold or issue derivative instruments for trading or other speculative purposes. Our derivative instruments are recorded in the Consolidated Balance Sheets at their fair values. Our derivative instruments do not qualify for hedge accounting, and accordingly, all changes in the fair value of the instruments are recognized as other income (expense) in the Consolidated Statements of Income. The maximum contractual period for our derivatives is currently less than twelve months. Our derivative instruments are not subject to master netting arrangements and are not offset in the Consolidated Balance Sheets.
	As of March 31, 2014, we had forward contracts outstanding with notional amounts totaling €20.7 million ($28.5 million), which mature through 2014.
	The fair values of our derivative instruments recorded in the Consolidated Balance Sheet as of March 31, 2014 and December 31, 2013 were as follows:
	(In thousands)	Balance Sheet	March 31,			December 31,
		Location	2014			2013
	Derivatives Not Designated as Hedging Instruments (Level 2):
	Foreign exchange contracts – asset derivatives	Other receivables	$	1		$	18
	Foreign exchange contracts – liability derivatives	Accounts payable	$	(8	)	$	(15	)
	The change in the fair values of our derivative instruments recorded in the Consolidated Statements of Income during the three months ended March 31, 2014 were as follows:
			Three Months Ended
	(In thousands)	Income Statement Location	March 31, 2014			March 31, 2013
	Derivatives Not Designated as Hedging Instruments:
	Foreign exchange contracts	Other income (expense)	$	(110	)	$	(224	)

Inventory

Inventory	3 Months Ended
	Mar. 31, 2014
Inventory Disclosure [Abstract]	'
Inventory	'
	7. INVENTORY
	At March 31, 2014 and December 31, 2013, inventory consisted of the following:
		March 31,		December 31,
	(In thousands)	2014		2013
	Raw materials	$	41,546	$	44,093
	Work in process		3,217		3,484
	Finished goods		42,633		42,534
	Total	$	87,396	$	90,111
	We establish reserves for estimated excess, obsolete, or unmarketable inventory equal to the difference between the cost of the inventory and the estimated fair value of the inventory based upon assumptions about future demand and market conditions. At March 31, 2014 and December 31, 2013, raw materials reserves totaled $17.0 million and $16.9 million, respectively, and finished goods inventory reserves totaled $4.9 million and $6.1 million, respectively. The decrease in finished goods inventory reserve from December 31, 2013 to March 31, 2014 is primarily attributable to the disposal of inventory that was fully reserved.

Goodwill_and_Intangible_Assets

Goodwill and Intangible Assets	3 Months Ended
	Mar. 31, 2014
Goodwill And Intangible Assets Disclosure [Abstract]	'
Goodwill and Intangible Assets	'
	8. GOODWILL AND INTANGIBLE ASSETS
	The change in the carrying value of goodwill, all of which is included in our Enterprise Networks division, for the three months ended March 31, 2014 is as follows:
	(In thousands)
	Balance, December 31, 2013	$	3,492
	Acquisitions		—
	Impairment losses		—
	Balance, March 31, 2014	$	3,492
	Balance as of March 31, 2014
	Goodwill	$	3,492
	Accumulated impairment losses		—
	Total goodwill	$	3,492
	We evaluate the carrying value of goodwill during the fourth quarter of each year and between annual evaluations if events occur or circumstances change that would more likely than not reduce the fair value of the reporting unit below its carrying amount. When evaluating whether goodwill is impaired, we compare the fair value of the reporting unit to which the goodwill is assigned to the reporting unit’s carrying amount, including goodwill. If the carrying amount of the reporting unit exceeds its fair value, then the amount of the impairment loss is measured. There were no impairment losses recorded during the three months ended March 31, 2014 or 2013.
	Intangible assets are included in other assets in the accompanying Consolidated Balance Sheets and include intangibles acquired in conjunction with our acquisition of Objectworld Communications Corporation on September 15, 2009, Bluesocket, Inc. on August 4, 2011, and the NSN BBA business on May 4, 2012.
	The following table presents our intangible assets as of March 31, 2014 and December 31, 2013:
	(In thousands)	March 31, 2014							December 31, 2013
		Gross		Accumulated			Net Value		Gross		Accumulated			Net Value
		Value		Amortization					Value		Amortization
	Customer relationships	$	6,963	$	(1,742	)	$	5,221	$	6,996	$	(1,555	)	$	5,441
	Developed technology		6,392		(2,939	)		3,453		6,537		(2,692	)		3,845
	Intellectual property		2,340		(1,269	)		1,071		2,340		(1,185	)		1,155
	Trade names		270		(160	)		110		270		(145	)		125
	Other		14		(9	)		5		14		(8	)		6
	Total	$	15,979	$	(6,119	)	$	9,860	$	16,157	$	(5,585	)	$	10,572
	Amortization expense, all of which relates to business acquisitions, was $0.6 million for the three months ended March 31, 2014 and 2013.
	As of March 31, 2014, the estimated future amortization expense of our intangible assets is as follows:
	(In thousands)	Amount
	Remainder of 2014	$	1,718
	2015		2,168
	2016		1,893
	2017		1,290
	2018		782
	Thereafter		2,009
	Total	$	9,860

Stockholders_Equity

Stockholders' Equity	3 Months Ended
	Mar. 31, 2014
Equity [Abstract]	'
Stockholders' Equity	'
	9. STOCKHOLDERS’ EQUITY
	A summary of the changes in stockholders’ equity for the three months ended March 31, 2014 is as follows:
		Stockholders’
	(In thousands)	Equity
	Balance, December 31, 2013	$	604,606
	Net income		9,607
	Dividend payments		(5,102	)
	Dividends accrued for unvested restricted stock units		6
	Net unrealized gains (losses) on available-for-sale securities (net of tax)		(921	)
	Foreign currency translation adjustment		252
	Proceeds from stock option exercises		1,541
	Purchase of treasury stock		(9,427	)
	Income tax benefit from exercise of stock options		57
	Stock-based compensation expense		2,057
	Balance, March 31, 2014	$	602,676
	Stock Repurchase Program
	Since 1997, our Board of Directors has approved multiple share repurchase programs that have authorized open market repurchase transactions of up to 40.0 million shares of our common stock. During the three months ended March 31, 2014, we repurchased 0.4 million shares of our common stock at an average price of $25.13 per share. We currently have the authority to purchase an additional 3.1 million shares of our common stock under the current plan approved by the Board of Directors on May 1, 2013.
	Stock Option Exercises
	We issued 0.1 million shares of treasury stock during the three months ended March 31, 2014 to accommodate employee stock option exercises. The stock options had exercise prices ranging from $15.29 to $23.46. We received proceeds totaling $1.5 million from the exercise of these stock options during the three months ended March 31, 2014.
	Dividend Payments
	During the three months ended March 31, 2014, we paid cash dividends as follows (in thousands except per share amounts):
	Record Date	Payment Date			Per Share Amount			Total Dividend Paid
	February 6, 2014		February 20, 2014		$	0.09		$	5,102
	Other Comprehensive Income
	Other comprehensive income consists of unrealized gains (losses) on available-for-sale securities, reclassification adjustments for amounts included in net income related to impairments of available-for-sale securities and realized gains (losses) on available-for-sale securities, defined benefit plan adjustments and foreign currency translation adjustments.
	The following tables present changes in accumulated other comprehensive income, net of tax, by component for the three months ended March 31, 2014 and 2013:
		Three Months Ended March 31, 2014
	(In thousands)	Unrealized			Defined			Foreign			Total
		Gains			Benefit Plan			Currency
		(Losses) on			Adjustments			Adjustments
		Available-
		for-Sale
		Securities
	Beginning balance	$	10,737		$	(891	)	$	907		$	10,753
	Other comprehensive income (loss) before reclassifications		402			—			252			654
	Amounts reclassified from accumulated other comprehensive income		(1,323	)		—			—			(1,323	)
	Net current period other comprehensive income (loss)		(921	)		—			252			(669	)
	Ending balance	$	9,816		$	(891	)	$	1,159		$	10,084
		Three Months Ended March 31, 2013
	(In thousands)	Unrealized			Defined			Foreign			Total
		Gains			Benefit Plan			Currency
		(Losses) on			Adjustments			Adjustments
		Available-
		for-Sale
		Securities
	Beginning balance	$	10,108		$	(1,952	)	$	3,112		$	11,268
	Other comprehensive income (loss) before reclassifications		454			—			323			777
	Amounts reclassified from accumulated other comprehensive income		(2,098	)		—			—			(2,098	)
	Net current period other comprehensive income (loss)		(1,644	)		—			323			(1,321	)
	Ending balance	$	8,464		$	(1,952	)	$	3,435		$	9,947
	The following tables present the details of reclassifications out of accumulated other comprehensive income for the three months ended March 31, 2014 and 2013:
	(In thousands)	Three Months Ended March 31, 2014
	Details about Accumulated Other	Amount Reclassified			Affected Line Item in the
	Comprehensive Income Components	from Accumulated			Statement Where Net Income Is
		Other Comprehensive			Presented
		Income
	Unrealized gains (losses) on available-for-sale securities:
	Net realized gain on sales of securities	$	2,170		Net realized investment gain
	Impairment expense		—		Net realized investment gain
	Total reclassifications for the period, before tax		2,170
	Tax (expense) benefit		(847	)
	Total reclassifications for the period, net of tax	$	1,323
	(In thousands)	Three Months Ended March 31, 2013
Details about Accumulated Other	Amount Reclassified			Affected Line Item in the
Comprehensive Income Components	from Accumulated			Statement Where Net Income Is
	Other Comprehensive			Presented
	Income
Unrealized gains (losses) on available-for-sale securities:
Net realized gain on sales of securities	$	3,444		Net realized investment gain
Impairment expense		(4	)	Net realized investment gain
Total reclassifications for the period, before tax		3,440
Tax (expense) benefit		(1,342	)
Total reclassifications for the period, net of tax	$	2,098
The following table presents the tax effects related to the change in each component of other comprehensive income for the three months ended March 31, 2014 and 2013:
	Three Months Ended									Three Months Ended
	March 31, 2014									March 31, 2013
(In thousands)	Before-Tax			Tax			Net-of-Tax			Before-Tax			Tax			Net-of-Tax
	Amount			(Expense)			Amount			Amount			(Expense)			Amount
				Benefit									Benefit
Unrealized gains (losses) on available-for-sale securities	$	659		$	(257	)	$	402		$	744		$	(290	)	$	454
Reclassification adjustment for amounts included in net income		(2,170	)		847			(1,323	)		(3,440	)		1,342			(2,098	)
Foreign currency translation adjustment		252			—			252			323			—			323
Total Other Comprehensive Income (Loss)	$	(1,259	)	$	590		$	(669	)	$	(2,373	)	$	1,052		$	(1,321	)

Earnings_Per_Share

Earnings Per Share	3 Months Ended
	Mar. 31, 2014
Earnings Per Share [Abstract]	'
Earnings Per Share	'
	10. EARNINGS PER SHARE
	A summary of the calculation of basic and diluted earnings per share for the three months ended March 31, 2014 and 2013 is as follows:
		Three Months Ended
		March 31,
	(In thousands, except per share amounts)	2014		2013
	Numerator
	Net income	$	9,607	$	7,890
	Denominator
	Weighted average number of shares – basic		56,751		61,847
	Effect of dilutive securities
	Stock options		602		162
	Restricted stock and restricted stock units		15		21
	Weighted average number of shares – diluted		57,368		62,030
	Net income per share – basic	$	0.17	$	0.13
	Net income per share – diluted	$	0.17	$	0.13
	Anti-dilutive options to purchase common stock outstanding were excluded from the above calculations. Anti-dilutive options totaled 3.1 million and 5.4 million for the three months ended March 31, 2014 and 2013, respectively.

Segment_Information

Segment Information	3 Months Ended
	Mar. 31, 2014
Segment Reporting [Abstract]	'
Segment Information	'
	11. SEGMENT INFORMATION
	We operate in two reportable segments: (1) the Carrier Networks Division and (2) the Enterprise Networks Division. We evaluate the performance of our segments based on gross profit; therefore, selling, general and administrative expense, research and development expenses, interest income and dividend income, interest expense, net realized investment gain/loss, other income/expense and provision for taxes are reported on an entity-wide basis only. There are no inter-segment revenues.
	The following table presents information about the reported sales and gross profit of our reportable segments for the three months ended March 31, 2014 and 2013. Asset information by reportable segment is not reported, since we do not produce such information internally.
			Three Months Ended
			March 31, 2014				March 31, 2013
	(In thousands)		Sales		Gross Profit		Sales		Gross Profit
	Carrier Networks		$	118,162	$	61,353	$	109,887	$	51,591
	Enterprise Networks			28,842		16,437		33,126		18,086
	Total		$	147,004	$	77,790	$	143,013	$	69,677
	Sales by Product
	Our three major product categories are Carrier Systems, Business Networking and Loop Access.
	Carrier Systems products are used by communications service providers to provide data, voice and video services to consumers and enterprises. This category includes the following product areas and related services:
		•		Broadband Access
		•		Total Access® 5000 Multi-Service Access Node (MSAN)
		•		hiX family of MSANs
		•		Total Access 1100/1200 Series of Fiber to the Node (FTTN) products
		•		Ultra Broadband Ethernet (UBE)
		•		Digital Subscriber Line Access Multiplexer (DSLAM) products
		•		Optical
		•		Optical Networking Edge (ONE)
		•		NetVanta 8000 Series of Fiber Ethernet Access Devices (EAD)
		•		OPTI-6100 and Total Access 3000 optical Multi-Service Provisioning Platforms (MSPP)
		•		Pluggable Optical Products, including SFP, XFP, and SFP+
		•		TDM systems
	Business Networking products provide access to communication services and facilitate the delivery of cloud connectivity and enterprise communications to the small and mid-sized enterprise (SME) market. This category includes the following product areas and related services:
		•		Internetworking products
		•		Total Access IP Business Gateways
		•		Optical Network Terminals (ONTs)
		•		Bluesocket® virtual Wireless LAN (vWLAN®)
		•		NetVanta®
		•		Multiservice Routers
		•		Managed Ethernet Switches
		•		IP Business Gateways
		•		Unified Communications (UC) solutions
		•		Carrier Ethernet Network Terminating Equipment (NTE)
		•		Network Management Solutions
		•		Integrated Access Devices (IADs)
	Loop Access products are used by carrier and enterprise customers for access to copper-based communications networks. The Loop Access category includes the following product areas and related services:
		•		High bit-rate Digital Subscriber Line (HDSL) products
		•		Digital Data Service (DDS)
		•		Integrated Services Digital Network (ISDN) products
		•		T1/E1/T3 Channel Service Units/Data Service Units (CSUs/DSUs)
		•		TRACER fixed-wireless products
	The table below presents sales information by product category for the three months ended March 31, 2014 and 2013:
			Three Months Ended
			March 31,
	(In thousands)		2014		2013
	Carrier Systems		$	99,553	$	92,804
	Business Networking			37,919		38,076
	Loop Access			9,532		12,133
	Total		$	147,004	$	143,013
	In addition, we identify subcategories of product revenues, which we divide into core products and legacy products. Our core products consist of Broadband Access and Optical products (included in Carrier Systems), and Internetworking products (included in Business Networking). Our legacy products include HDSL products (included in Loop Access) and other products not included in the aforementioned core products.
	The table below presents subcategory revenues for the three months ended March 31, 2014 and 2013:
			Three Months Ended
			March 31,
	(In thousands)		2014		2013
	Core Products
	Broadband Access (included in Carrier Systems)		$	81,527	$	72,234
	Optical (included in Carrier Systems)			12,789		8,874
	Internetworking (included in Business Networking)			36,946		36,912
	Subtotal			131,262		118,020
	Legacy Products
	HDSL (does not include T1) (included in Loop Access)			8,877		11,407
Other products (excluding HDSL)			6,865		13,586
Subtotal			15,742		24,993
Total		$	147,004	$	143,013

Liability_for_Warranty_Returns

Liability for Warranty Returns	3 Months Ended
	Mar. 31, 2014
Guarantees [Abstract]	'
Liability for Warranty Returns	'
	12. LIABILITY FOR WARRANTY RETURNS
	Our products generally include warranties of 90 days to ten years for product defects. We accrue for warranty returns at the time revenue is recognized based on our estimate of the cost to repair or replace the defective products. We engage in extensive product quality programs and processes, including actively monitoring and evaluating the quality of our component suppliers. Our products continue to become more complex in both size and functionality as many of our product offerings migrate from line card applications to systems products. The increasing complexity of our products will cause warranty incidences, when they arise, to be more costly. Our estimates regarding future warranty obligations may change due to product failure rates, material usage, and other rework costs incurred in correcting a product failure. In addition, from time to time, specific warranty accruals may be recorded if unforeseen problems arise. Should our actual experience relative to these factors be worse than our estimates, we will be required to record additional warranty expense. Alternatively, if we provide for more reserves than we require, we will reverse a portion of such provisions in future periods. The liability for warranty obligations totaled $7.4 million at March 31, 2014 and $9.0 million at December 31, 2013. The decrease from December 31, 2013 to March 31, 2014 includes a $1.5 million decrease related to the settlement of an outstanding warranty claim, which corresponds to a reduction in Other Receivables. These liabilities are included in accrued expenses in the accompanying Consolidated Balance Sheets.
	A summary of warranty expense and write-off activity for the three months ended March 31, 2014 and 2013 is as follows:
		Three Months Ended
		March 31,
		2014			2013
	(In thousands)
	Balance at beginning of period	$	8,977		$	9,653
	Plus: Amounts charged to cost and expenses		434			397
	Less: Deductions		(2,019	)		(1,258	)
	Balance at end of period	$	7,392		$	8,792
	Deductions for the three months ended March 31, 2014 include a $1.5 million reduction that relates to the settlement of an outstanding warranty claim, which corresponds to a reduction in Other Receivables.

Related_Party_Transactions

Related Party Transactions	3 Months Ended
	Mar. 31, 2014
Related Party Transactions [Abstract]	'
Related Party Transactions	'
	13. RELATED PARTY TRANSACTIONS
	We employ the law firm of our director emeritus for legal services. All bills for services rendered by this firm are reviewed and approved by our Chief Financial Officer. We believe that the fees for such services are comparable to those charged by other firms for services rendered to us. For the three months ended March 31, 2014 and 2013, we incurred fees of $10 thousand per month for these legal services.

Commitments_and_Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2014
Commitments And Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	14. COMMITMENTS AND CONTINGENCIES
	In the ordinary course of business, we may be subject to various legal proceedings and claims, including employment disputes, patent claims, disputes over contract agreements and other commercial disputes. In some cases, claimants seek damages or other relief, such as royalty payments related to patents, which, if granted, could require significant expenditures. Although the outcome of any claim or litigation can never be certain, it is our opinion that the outcome of all contingencies of which we are currently aware will not materially affect our business, operations, financial condition or cash flows.
	We have committed to invest up to an aggregate of $7.9 million in two private equity funds, and we have contributed $8.4 million as of March 31, 2014, of which $7.7 million has been applied to these commitments.

Subsequent_Events

Subsequent Events	3 Months Ended
	Mar. 31, 2014
Subsequent Events [Abstract]	'
Subsequent Events	'
	15. SUBSEQUENT EVENTS
	On April 15, 2014, we announced that our Board of Directors declared a quarterly cash dividend of $0.09 per common share to be paid to stockholders of record at the close of business on May 1, 2014. The payment date will be May 15, 2014. The quarterly dividend payment will be approximately $5.0 million. In July 2003, our Board of Directors elected to begin declaring quarterly dividends on our common stock considering the tax treatment of dividends and adequate levels of Company liquidity.
	During the second quarter and as of May 7, 2014, we have repurchased 1.3 million shares of our common stock through open market purchases at an average cost of $22.63 per share. We currently have the authority to purchase an additional 1.8 million shares of our common stock under the current plan approved by the Board of Directors.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2014
Accounting Policies [Abstract]	'
Basis of Presentation	'
	Basis of Presentation
	The accompanying unaudited consolidated financial statements of ADTRAN®, Inc. and its subsidiaries (ADTRAN) have been prepared pursuant to the rules and regulations for reporting on Quarterly Reports on Form 10-Q. Accordingly, certain information and notes required by generally accepted accounting principles for complete financial statements are not included herein. The December 31, 2013 Consolidated Balance Sheet is derived from audited financial statements, but does not include all disclosures required by accounting principles generally accepted in the United States.
	In the opinion of management, all adjustments necessary for a fair presentation of these interim statements have been recorded and are of a normal and recurring nature. The results of operations for an interim period are not necessarily indicative of the results for the full year. The interim statements should be read in conjunction with the financial statements and notes thereto included in ADTRAN’s Annual Report on Form 10-K for the year ended December 31, 2013, filed on February 27, 2014 with the SEC.
Changes in Classifications	'
	Changes in Classifications
	We corrected immaterial misclassifications between the operating and investing sections of our consolidated statements of cash flows and adjusted our cash flows for the three months ended March 31, 2013 in these categories by $0.1 million in order to be consistent with the 2014 presentation.
Out of Period Adjustment	'
	Out of Period Adjustment
	During the year ended December 31, 2013, we identified two adjustments in the acquired NSN (formerly Nokia Siemens Networks) Broadband Access business (NSN BBA business) relating to customer payment discounts for one customer, and recoverable VAT taxes on certain vendor freight invoices that should have been recorded in prior periods. These adjustments resulted from a $0.3 million understatement of net income in the first quarter of 2013. We evaluated the impact of the adjustments on the results of our previously issued financial statements for first quarter of 2013 and concluded that the impact was not material. We also evaluated the impact of the cumulative effect of the adjustments in 2013 and concluded that the impact was not material to our results for the year 2013. Accordingly, during the three months ended September 30, 2013 we recorded an out of period adjustment to correct these issues.
Use of Estimates	'
	Use of Estimates
	The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expense during the reporting period. Our more significant estimates include the obsolete and excess inventory reserves, warranty reserves, customer rebates, determination of the deferred revenue components of multiple element sales agreements, estimated costs to complete obligations associated with deferred revenues, estimated income tax provision and income tax contingencies, the fair value of stock-based compensation, impairment of goodwill, valuation and estimated lives of intangible assets, estimated working capital adjustments under negotiation related to the NSN BBA business acquisition, estimated pension liability, fair value of investments, and the evaluation of other-than-temporary declines in the value of investments. Actual amounts could differ significantly from these estimates.
Recent Accounting Pronouncements	'
	Recent Accounting Pronouncements
	During the three months ended March 31, 2014, no accounting pronouncements were issued that would have a material effect on our consolidated results of operations or financial condition.

Pension_Benefit_Plan_Tables

Pension Benefit Plan (Tables)	3 Months Ended
	Mar. 31, 2014
Compensation And Retirement Disclosure [Abstract]	'
Summarization of Components of Net Periodic Pension Cost	'
	The following table summarizes the components of net periodic pension cost for the three months ended March 31, 2014 and 2013:
		Three Months Ended
		March 31,
	(In thousands)	2014			2013
	Service cost	$	305		$	300
	Interest cost		215			187
	Expected return on plan assets		(279	)		(253	)
	Net periodic pension cost	$	241		$	234

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Stock-Based Compensation Expense Related to Stock Options, Restricted Stock Units (RSUs) and Restricted Stock	'
	The following table summarizes the stock-based compensation expense related to stock options, restricted stock units (RSUs) and restricted stock for the three months ended March 31, 2014 and 2013, which was recognized as follows:
		Three Months Ended
		March 31,
	(In thousands)	2014			2013
	Stock-based compensation expense included in cost of sales	$	116		$	106
	Selling, general and administrative expense		1,026			1,063
	Research and development expense		915			1,063
	Stock-based compensation expense included in operating expenses		1,941			2,126
	Total stock-based compensation expense		2,057			2,232
	Tax benefit for expense associated with		(284	)		(307	)
	non-qualified options
	Total stock-based compensation expense, net of tax	$	1,773		$	1,925
Summary of Weighted-Average Assumptions and Value of Options Granted	'
	The weighted-average assumptions and value of options granted for the three months ended March 31, 2014 are summarized as follows:
		Three Months Ended
		March 31,
		2014
	Expected volatility		39.57	%
	Risk-free interest rate		1.86	%
	Expected dividend yield		1.38	%
	Expected life (in years)		6.25
	Weighted-average estimated value	$	9.28
Summary of Stock Options Outstanding	'
	The following table is a summary of our stock options outstanding as of December 31, 2013 and March 31, 2014 and the changes that occurred during the three months ended March 31, 2014:
	(In thousands, except per share amounts)	Number of			Weighted Avg.			Weighted Avg.		Aggregate
		Options			Exercise Price			Remaining		Intrinsic
								Contractual		Value
								Life In Years
	Options outstanding, December 31, 2013		6,358		$	24.43			6.6	$	25,878
	Options granted		2		$	26.03
	Options cancelled/forfeited		(61	)	$	25.16
	Options exercised		(78	)	$	19.71
	Options outstanding, March 31, 2014		6,221		$	24.48			6.35	$	14,478
	Options exercisable, March 31, 2014		3,826		$	24.84			4.93	$	8,526

Investments_Tables

Investments (Tables)	3 Months Ended
	Mar. 31, 2014
Investments Debt And Equity Securities [Abstract]	'
Securities and Investments, Recorded at Either Fair Value or Cost	'
	At March 31, 2014, we held the following securities and investments, recorded at either fair value or cost.
	(In thousands)	Amortized			Gross Unrealized						Carrying
		Cost			Gains			Losses			Value
	Deferred compensation plan assets	$	12,523		$	2,770		$	(16	)	$	15,277
	Corporate bonds		130,437			456			(30	)		130,863
	Municipal fixed-rate bonds		157,851			673			(137	)		158,387
	Municipal variable rate demand notes		24,840			—			—			24,840
	Marketable equity securities		25,166			12,798			(378	)		37,586
	Available-for-sale securities held at fair value	$	350,817		$	16,697		$	(561	)	$	366,953
	Restricted investment held at cost											30,000
	Other investments held at cost											1,659
	Total carrying value of available-for-sale investments										$	398,612
	At December 31, 2013, we held the following securities and investments, recorded at either fair value or cost.
	(In thousands)	Amortized			Gross Unrealized						Carrying
		Cost			Gains			Losses			Value
	Deferred compensation plan assets	$	12,300		$	2,847		$	(24	)	$	15,123
	Corporate bonds		166,370			534			(45	)		166,859
	Municipal fixed-rate bonds		135,773			583			(54	)		136,302
	Municipal variable rate demand notes		8,310			—			—			8,310
	Marketable equity securities		24,654			13,975			(177	)		38,452
	Available-for-sale securities held at fair value	$	347,407		$	17,939		$	(300	)	$	365,046
	Restricted investment held at cost											48,250
	Other investments held at cost											1,689
	Total carrying value of available-for-sale investments										$	414,985
Contractual Maturities of Corporate and Municipal Fixed-Rate Bonds	'
	As of March 31, 2014, our corporate bonds and municipal fixed-rate bonds had the following contractual maturities:
	(In thousands)	Corporate			Municipal
		bonds			fixed-rate
					bonds
	Less than one year	$	34,248		$	34,630
	One to two years		52,222			60,991
	Two to three years		44,393			47,713
	Three to five years		—			15,053
	Total	$	130,863		$	158,387
Gross Realized Gains and Losses on Sale of Securities	'
	The following table presents gross realized gains and losses related to our investments.
		Three Months Ended
		March 31,
	(In thousands)	2014			2013
	Gross realized gains	$	2,228		$	3,727
	Gross realized losses	$	(36	)	$	(82	)
Fair Value Measurements of Cash Equivalents Held in Money Market Funds and Investments	'
	We have categorized our cash equivalents held in money market funds and our investments held at fair value into a three-level fair value hierarchy based on the priority of the inputs to the valuation technique for the cash equivalents and investments as follows: Level 1—Values based on unadjusted quoted prices for identical assets or liabilities in an active market; Level 2—Values based on quoted prices in markets that are not active or model inputs that are observable either directly or indirectly; Level 3—Values based on prices or valuation techniques that require inputs that are both unobservable and significant to the overall fair value measurement. These inputs include information supplied by investees.
		Fair Value Measurements at March 31, 2014 Using
	(In thousands)	Fair Value			Quoted Prices			Significant			Significant
					in Active			Other			Unobservable
					Market for			Observable			Inputs
					Identical			Inputs			(Level 3)
					Assets			(Level 2)
					(Level 1)
	Cash equivalents
	Money market funds	$	11,742		$	11,742		$	—		$	—
	Available-for-sale securities
	Deferred compensation plan assets		15,277			15,277			—			—
	Available-for-sale debt securities
	Corporate bonds		130,863			—			130,863			—
	Municipal fixed-rate bonds		158,387			—			158,387			—
	Municipal variable rate demand notes		24,840			—			24,840			—
	Available-for-sale marketable equity securities
	Equity securities – technology industry		10,639			10,639			—			—
	Equity securities – other		26,947			26,947			—			—
	Available-for-sale securities		366,953			52,863			314,090			—
	Total	$	378,695		$	64,605		$	314,090		$	—
		Fair Value Measurements at December 31, 2013 Using
	(In thousands)	Fair Value			Quoted Prices			Significant			Significant
					in Active			Other			Unobservable
					Market for			Observable			Inputs
					Identical			Inputs			(Level 3)
					Assets			(Level 2)
					(Level 1)
	Cash equivalents
	Money market funds	$	3,949		$	3,949		$	—		$	—
	Available-for-sale securities
	Deferred compensation plan assets		15,123			15,123			—			—
	Available-for-sale debt securities
	Corporate bonds		166,859			—			166,859			—
	Municipal fixed-rate bonds		136,302			—			136,302			—
	Municipal variable rate demand notes		8,310			—			8,310			—
	Available-for-sale marketable equity securities
	Equity securities – technology industry		11,398			11,398			—			—
	Equity securities – other		27,054			27,054			—			—
	Available-for-sale securities		365,046			53,575			311,471			—
	Total	$	368,995		$	57,524		$	311,471		$	—

Derivative_Instruments_and_Hed1

Derivative Instruments and Hedging Activities (Tables)	3 Months Ended
	Mar. 31, 2014
Derivative Instruments And Hedging Activities Disclosure [Abstract]	'
Schedule of Fair Values of Hedging Instruments Recorded in Consolidated Balance Sheet	'
	The fair values of our derivative instruments recorded in the Consolidated Balance Sheet as of March 31, 2014 and December 31, 2013 were as follows:
	(In thousands)	Balance Sheet	March 31,			December 31,
		Location	2014			2013
	Derivatives Not Designated as Hedging Instruments (Level 2):
	Foreign exchange contracts – asset derivatives	Other receivables	$	1		$	18
	Foreign exchange contracts – liability derivatives	Accounts payable	$	(8	)	$	(15	)
Schedule of Change in Fair Values of Derivative Instruments Recorded in Consolidated Statements of Income	'
	The change in the fair values of our derivative instruments recorded in the Consolidated Statements of Income during the three months ended March 31, 2014 were as follows:
			Three Months Ended
	(In thousands)	Income Statement Location	March 31, 2014			March 31, 2013
	Derivatives Not Designated as Hedging Instruments:
	Foreign exchange contracts	Other income (expense)	$	(110	)	$	(224	)

Inventory_Tables

Inventory (Tables)	3 Months Ended
	Mar. 31, 2014
Inventory Disclosure [Abstract]	'
Components of Inventory	'
	At March 31, 2014 and December 31, 2013, inventory consisted of the following:
		March 31,		December 31,
	(In thousands)	2014		2013
	Raw materials	$	41,546	$	44,093
	Work in process		3,217		3,484
	Finished goods		42,633		42,534
	Total	$	87,396	$	90,111

Goodwill_and_Intangible_Assets1

Goodwill and Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2014
Goodwill And Intangible Assets Disclosure [Abstract]	'
Changes in Carrying Value of Goodwill	'
	The change in the carrying value of goodwill, all of which is included in our Enterprise Networks division, for the three months ended March 31, 2014 is as follows:
	(In thousands)
	Balance, December 31, 2013	$	3,492
	Acquisitions		—
	Impairment losses		—
	Balance, March 31, 2014	$	3,492
	Balance as of March 31, 2014
	Goodwill	$	3,492
	Accumulated impairment losses		—
	Total goodwill	$	3,492
Summary of Intangible Assets	'
	The following table presents our intangible assets as of March 31, 2014 and December 31, 2013:
	(In thousands)	March 31, 2014							December 31, 2013
		Gross		Accumulated			Net Value		Gross		Accumulated			Net Value
		Value		Amortization					Value		Amortization
	Customer relationships	$	6,963	$	(1,742	)	$	5,221	$	6,996	$	(1,555	)	$	5,441
	Developed technology		6,392		(2,939	)		3,453		6,537		(2,692	)		3,845
	Intellectual property		2,340		(1,269	)		1,071		2,340		(1,185	)		1,155
	Trade names		270		(160	)		110		270		(145	)		125
	Other		14		(9	)		5		14		(8	)		6
	Total	$	15,979	$	(6,119	)	$	9,860	$	16,157	$	(5,585	)	$	10,572
Estimated Future Amortization Expense Related to Intangible Assets	'
	As of March 31, 2014, the estimated future amortization expense of our intangible assets is as follows:
	(In thousands)	Amount
	Remainder of 2014	$	1,718
	2015		2,168
	2016		1,893
	2017		1,290
	2018		782
	Thereafter		2,009
	Total	$	9,860

Stockholders_Equity_Tables

Stockholders' Equity (Tables)	3 Months Ended
	Mar. 31, 2014
Equity [Abstract]	'
Summary of Changes in Stockholders' Equity	'
	A summary of the changes in stockholders’ equity for the three months ended March 31, 2014 is as follows:
		Stockholders’
	(In thousands)	Equity
	Balance, December 31, 2013	$	604,606
	Net income		9,607
	Dividend payments		(5,102	)
	Dividends accrued for unvested restricted stock units		6
	Net unrealized gains (losses) on available-for-sale securities (net of tax)		(921	)
	Foreign currency translation adjustment		252
	Proceeds from stock option exercises		1,541
	Purchase of treasury stock		(9,427	)
	Income tax benefit from exercise of stock options		57
	Stock-based compensation expense		2,057
	Balance, March 31, 2014	$	602,676
Cash Dividends	'
	During the three months ended March 31, 2014, we paid cash dividends as follows (in thousands except per share amounts):
	Record Date	Payment Date			Per Share Amount			Total Dividend Paid
	February 6, 2014		February 20, 2014		$	0.09		$	5,102
Changes in Accumulated Other Comprehensive Income, Net of Tax by Component	'
	The following tables present changes in accumulated other comprehensive income, net of tax, by component for the three months ended March 31, 2014 and 2013:
		Three Months Ended March 31, 2014
	(In thousands)	Unrealized			Defined			Foreign			Total
		Gains			Benefit Plan			Currency
		(Losses) on			Adjustments			Adjustments
		Available-
		for-Sale
		Securities
	Beginning balance	$	10,737		$	(891	)	$	907		$	10,753
	Other comprehensive income (loss) before reclassifications		402			—			252			654
	Amounts reclassified from accumulated other comprehensive income		(1,323	)		—			—			(1,323	)
	Net current period other comprehensive income (loss)		(921	)		—			252			(669	)
	Ending balance	$	9,816		$	(891	)	$	1,159		$	10,084
		Three Months Ended March 31, 2013
	(In thousands)	Unrealized			Defined			Foreign			Total
		Gains			Benefit Plan			Currency
		(Losses) on			Adjustments			Adjustments
		Available-
		for-Sale
		Securities
	Beginning balance	$	10,108		$	(1,952	)	$	3,112		$	11,268
	Other comprehensive income (loss) before reclassifications		454			—			323			777
	Amounts reclassified from accumulated other comprehensive income		(2,098	)		—			—			(2,098	)
	Net current period other comprehensive income (loss)		(1,644	)		—			323			(1,321	)
	Ending balance	$	8,464		$	(1,952	)	$	3,435		$	9,947
Reclassifications Out of Accumulated Other Comprehensive Income	'
	The following tables present the details of reclassifications out of accumulated other comprehensive income for the three months ended March 31, 2014 and 2013:
	(In thousands)	Three Months Ended March 31, 2014
	Details about Accumulated Other	Amount Reclassified			Affected Line Item in the
	Comprehensive Income Components	from Accumulated			Statement Where Net Income Is
		Other Comprehensive			Presented
		Income
	Unrealized gains (losses) on available-for-sale securities:
	Net realized gain on sales of securities	$	2,170		Net realized investment gain
	Impairment expense		—		Net realized investment gain
	Total reclassifications for the period, before tax		2,170
	Tax (expense) benefit		(847	)
	Total reclassifications for the period, net of tax	$	1,323
	(In thousands)	Three Months Ended March 31, 2013
	Details about Accumulated Other	Amount Reclassified			Affected Line Item in the
	Comprehensive Income Components	from Accumulated			Statement Where Net Income Is
		Other Comprehensive			Presented
		Income
	Unrealized gains (losses) on available-for-sale securities:
	Net realized gain on sales of securities	$	3,444		Net realized investment gain
	Impairment expense		(4	)	Net realized investment gain
	Total reclassifications for the period, before tax		3,440
	Tax (expense) benefit		(1,342	)
	Total reclassifications for the period, net of tax	$	2,098
Other Comprehensive Income	'
	The following table presents the tax effects related to the change in each component of other comprehensive income for the three months ended March 31, 2014 and 2013:
		Three Months Ended									Three Months Ended
		March 31, 2014									March 31, 2013
	(In thousands)	Before-Tax			Tax			Net-of-Tax			Before-Tax			Tax			Net-of-Tax
		Amount			(Expense)			Amount			Amount			(Expense)			Amount
					Benefit									Benefit
	Unrealized gains (losses) on available-for-sale securities	$	659		$	(257	)	$	402		$	744		$	(290	)	$	454
	Reclassification adjustment for amounts included in net income		(2,170	)		847			(1,323	)		(3,440	)		1,342			(2,098	)
	Foreign currency translation adjustment		252			—			252			323			—			323
	Total Other Comprehensive Income (Loss)	$	(1,259	)	$	590		$	(669	)	$	(2,373	)	$	1,052		$	(1,321	)

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2014
Earnings Per Share [Abstract]	'
Summary of Calculation of Basic and Diluted Earnings Per Share	'
	A summary of the calculation of basic and diluted earnings per share for the three months ended March 31, 2014 and 2013 is as follows:
		Three Months Ended
		March 31,
	(In thousands, except per share amounts)	2014		2013
	Numerator
	Net income	$	9,607	$	7,890
	Denominator
	Weighted average number of shares – basic		56,751		61,847
	Effect of dilutive securities
	Stock options		602		162
	Restricted stock and restricted stock units		15		21
	Weighted average number of shares – diluted		57,368		62,030
	Net income per share – basic	$	0.17	$	0.13
	Net income per share – diluted	$	0.17	$	0.13

Segment_Information_Tables

Segment Information (Tables)	3 Months Ended
	Mar. 31, 2014
Segment Reporting [Abstract]	'
Sales and Gross Profit of Reportable Segments	'
	The following table presents information about the reported sales and gross profit of our reportable segments for the three months ended March 31, 2014 and 2013. Asset information by reportable segment is not reported, since we do not produce such information internally.
		Three Months Ended
		March 31, 2014				March 31, 2013
	(In thousands)	Sales		Gross Profit		Sales		Gross Profit
	Carrier Networks	$	118,162	$	61,353	$	109,887	$	51,591
	Enterprise Networks		28,842		16,437		33,126		18,086
	Total	$	147,004	$	77,790	$	143,013	$	69,677
Sales Information by Product Category	'
	The table below presents sales information by product category for the three months ended March 31, 2014 and 2013:
		Three Months Ended
		March 31,
	(In thousands)	2014		2013
	Carrier Systems	$	99,553	$	92,804
	Business Networking		37,919		38,076
	Loop Access		9,532		12,133
	Total	$	147,004	$	143,013
Subcategory Revenues	'
	The table below presents subcategory revenues for the three months ended March 31, 2014 and 2013:
		Three Months Ended
		March 31,
	(In thousands)	2014		2013
	Core Products
	Broadband Access (included in Carrier Systems)	$	81,527	$	72,234
	Optical (included in Carrier Systems)		12,789		8,874
	Internetworking (included in Business Networking)		36,946		36,912
	Subtotal		131,262		118,020
	Legacy Products
	HDSL (does not include T1) (included in Loop Access)		8,877		11,407
	Other products (excluding HDSL)		6,865		13,586
	Subtotal		15,742		24,993
	Total	$	147,004	$	143,013

Liability_for_Warranty_Returns1

Liability for Warranty Returns (Tables)	3 Months Ended
	Mar. 31, 2014
Guarantees [Abstract]	'
Summary of Warranty Expense and Write-Off Activity	'
	A summary of warranty expense and write-off activity for the three months ended March 31, 2014 and 2013 is as follows:
		Three Months Ended
		March 31,
		2014			2013
	(In thousands)
	Balance at beginning of period	$	8,977		$	9,653
	Plus: Amounts charged to cost and expenses		434			397
	Less: Deductions		(2,019	)		(1,258	)
	Balance at end of period	$	7,392		$	8,792

Summary_of_Significant_Account2

Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2013
	Adjustments to Operating Activities [Member]	Adjustments to Investing Activities [Member]	Immaterial Corrections [Member]
Summary of Significant Accounting Policy [Line Items]	'	'	'
Prior period reclassification adjustment	$0.10	$0.10	'
Understatement of net income in the first quarter of 2013	'	'	$0.30

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Income Tax Disclosure [Abstract]	'	'
Effective tax rate	34.60%	18.90%

Pension_Benefit_Plan_Summariza

Pension Benefit Plan - Summarization of Components of Net Periodic Pension Cost (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Compensation And Retirement Disclosure [Abstract]	'	'
Service cost	$305	$300
Interest cost	215	187
Expected return on plan assets	-279	-253
Net periodic pension cost	$241	$234

StockBased_Compensation_StockB

Stock-Based Compensation - Stock-Based Compensation Expense Related to Stock Options, Restricted Stock Units (RSUs) and Restricted Stock (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'
Total stock-based compensation expense	$2,057	$2,232
Tax benefit for expense associated with non-qualified options	-284	-307
Total stock-based compensation expense, net of tax	1,773	1,925
Cost of Sales [Member]	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'
Total stock-based compensation expense	116	106
Selling, General and Administrative Expense [Member]	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'
Total stock-based compensation expense	1,026	1,063
Research and Development Expense [Member]	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'
Total stock-based compensation expense	915	1,063
Operating Expenses [Member]	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'
Total stock-based compensation expense	$1,941	$2,126

StockBased_Compensation_Additi

Stock-Based Compensation - Additional Information (Detail) (USD $)	3 Months Ended
In Millions, except Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Number of Options, granted	2,000	0
Estimated forfeitures for stock options	2.50%	'
Forfeiture rate for RSUs and restricted stock	0.00%	'
Compensation expense related to non-vested stock options, RSUs and restricted stock not yet recognized	$16.40	'
Recognition period of non-vested compensation cost	'2 years 6 months	'
Total pre-tax intrinsic value of options exercised	$0.50	'
Restricted Stock Units (RSUs) [Member]	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Number of RSUs and restricted stock grants in period	0	0
Number of RSUs and restricted stock forfeitures in period	0	0
Number of RSUs and restricted stock vesting in period	0	0
Restricted Stock [Member]	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Number of RSUs and restricted stock grants in period	0	0
Number of RSUs and restricted stock forfeitures in period	0	0
Number of RSUs and restricted stock vesting in period	0	0

StockBased_Compensation_Summar

Stock-Based Compensation - Summary of Weighted-Average Assumptions and Value of Options Granted (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Expected volatility	39.57%
Risk-free interest rate	1.86%
Expected dividend yield	1.38%
Expected life (in years)	'6 years 3 months
Weighted-average estimated value	$9.28

StockBased_Compensation_Summar1

Stock-Based Compensation - Summary of Stock Options Outstanding (Detail) (USD $)	3 Months Ended		12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'	'	'
Number of Options, outstanding, Beginning Balance	6,358	'	'
Number of Options, granted	2	0	'
Number of Options, cancelled/forfeited	-61	'	'
Number of Options, exercised	-78	'	'
Number of Options, outstanding, Ending Balance	6,221	'	6,358
Number of Options, Options exercisable	3,826	'	'
Weighted Average Exercise Price, outstanding, Beginning Balance	$24.43	'	'
Weighted Average Exercise Price, granted	$26.03	'	'
Weighted Average Exercise Price, cancelled/forfeited	$25.16	'	'
Weighted Average Exercise Price, exercised	$19.71	'	'
Weighted Average Exercise Price, outstanding, Ending Balance	$24.48	'	$24.43
Weighted Average Exercise Price, Options exercisable	$24.84	'	'
Weighted Average Remaining Contractual Life In Years, Options outstanding	'6 years 4 months 6 days	'	'6 years 7 months 6 days
Weighted Average Remaining Contractual Life In Years, Options exercisable	'4 years 11 months 5 days	'	'
Aggregate Intrinsic Value, Options outstanding, Beginning Balance	$25,878	'	'
Aggregate Intrinsic Value, Options outstanding, Ending Balance	14,478	'	25,878
Aggregate Intrinsic Value, Options exercisable	$8,526	'	'

Investments_Securities_and_Inv

Investments - Securities and Investments, Recorded at Either Fair Value or Cost (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	$350,817	$347,407
Gross Unrealized Gains	16,697	17,939
Gross Unrealized Losses	-561	-300
Available-for-sale-securities, Fair Value/Carrying Value	366,953	365,046
Restricted investment held at cost	30,000	48,250
Other investments held at cost	1,659	1,689
Total carrying value of available-for-sale investments	398,612	414,985
Deferred Compensation Plan Assets [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	12,523	12,300
Gross Unrealized Gains	2,770	2,847
Gross Unrealized Losses	-16	-24
Available-for-sale-securities, Fair Value/Carrying Value	15,277	15,123
Corporate Bonds [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	130,437	166,370
Gross Unrealized Gains	456	534
Gross Unrealized Losses	-30	-45
Available-for-sale-securities, Fair Value/Carrying Value	130,863	166,859
Municipal Fixed-Rate Bonds [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	157,851	135,773
Gross Unrealized Gains	673	583
Gross Unrealized Losses	-137	-54
Available-for-sale-securities, Fair Value/Carrying Value	158,387	136,302
Municipal Variable Rate Demand Notes [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	24,840	8,310
Available-for-sale-securities, Fair Value/Carrying Value	24,840	8,310
Marketable Equity Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	25,166	24,654
Gross Unrealized Gains	12,798	13,975
Gross Unrealized Losses	-378	-177
Available-for-sale-securities, Fair Value/Carrying Value	$37,586	$38,452

Investments_Contractual_Maturi

Investments - Contractual Maturities of Corporate and Municipal Fixed-Rate Bonds (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale-securities, Fair Value/Carrying Value	$366,953	$365,046
Corporate Bonds [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Less than one year	34,248	'
One to two years	52,222	'
Two to three years	44,393	'
Available-for-sale-securities, Fair Value/Carrying Value	130,863	'
Municipal Fixed-Rate Bonds [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Less than one year	34,630	'
One to two years	60,991	'
Two to three years	47,713	'
Three to five years	15,053	'
Available-for-sale-securities, Fair Value/Carrying Value	$158,387	'

Investments_Additional_Informa

Investments - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
		Securities
Schedule of Investments [Line Items]	'	'	'
Restricted certificate of deposit held	$30,000,000	'	$48,250,000
Principal payment on the Bond	16,500,000	'	'
Identification of potential other-than-temporary impairments	25.00%	'	'
Impairment of investments	'	4,000	'
Number of marketable equity securities impaired	'	1	'
Alabama State Industrial Development Authority [Member] | Taxable Revenue Bond [Member] | Significant Other Observable Inputs (Level 2) [Member]	'	'	'
Schedule of Investments [Line Items]	'	'	'
Estimated fair value of bond	$29,600,000	'	'
Investment [Member] | Issuer Concentration [Member] | Market Value of Total Investment Portfolio [Member]	'	'	'
Schedule of Investments [Line Items]	'	'	'
Investment concentration risk percentage	5.00%	'	'

Investments_Gross_Realized_Gai

Investments - Gross Realized Gains and Losses on Sale of Securities (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Investments Debt And Equity Securities [Abstract]	'	'
Gross realized gains	$2,228	$3,727
Gross realized losses	($36)	($82)

Investments_Fair_Value_Measure

Investments - Fair Value Measurements of Cash Equivalents Held in Money Market Funds and Investments (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale securities	$366,953	$365,046
Corporate Bonds [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale securities	130,863	'
Municipal Fixed-Rate Bonds [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale securities	158,387	'
Fair Value, Measurements, Recurring [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale securities	366,953	365,046
Total	378,695	368,995
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Market for Identical Assets (Level 1) [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale securities	52,863	53,575
Total	64,605	57,524
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale securities	314,090	311,471
Total	314,090	311,471
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale securities	'	'
Total	'	'
Fair Value, Measurements, Recurring [Member] | Money Market Funds [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Cash equivalents	11,742	3,949
Fair Value, Measurements, Recurring [Member] | Money Market Funds [Member] | Quoted Prices in Active Market for Identical Assets (Level 1) [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Cash equivalents	11,742	3,949
Fair Value, Measurements, Recurring [Member] | Money Market Funds [Member] | Significant Unobservable Inputs (Level 3) [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Cash equivalents	'	'
Fair Value, Measurements, Recurring [Member] | Deferred Compensation Plan Assets [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale securities	15,277	15,123
Fair Value, Measurements, Recurring [Member] | Deferred Compensation Plan Assets [Member] | Quoted Prices in Active Market for Identical Assets (Level 1) [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale securities	15,277	15,123
Fair Value, Measurements, Recurring [Member] | Deferred Compensation Plan Assets [Member] | Significant Unobservable Inputs (Level 3) [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale securities	'	'
Fair Value, Measurements, Recurring [Member] | Corporate Bonds [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale securities	130,863	166,859
Fair Value, Measurements, Recurring [Member] | Corporate Bonds [Member] | Significant Other Observable Inputs (Level 2) [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale securities	130,863	166,859
Fair Value, Measurements, Recurring [Member] | Corporate Bonds [Member] | Significant Unobservable Inputs (Level 3) [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale securities	'	'
Fair Value, Measurements, Recurring [Member] | Municipal Fixed-Rate Bonds [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale securities	158,387	136,302
Fair Value, Measurements, Recurring [Member] | Municipal Fixed-Rate Bonds [Member] | Significant Other Observable Inputs (Level 2) [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale securities	158,387	136,302
Fair Value, Measurements, Recurring [Member] | Municipal Fixed-Rate Bonds [Member] | Significant Unobservable Inputs (Level 3) [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale securities	'	'
Fair Value, Measurements, Recurring [Member] | Municipal Variable Rate Demand Notes [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale securities	24,840	8,310
Fair Value, Measurements, Recurring [Member] | Municipal Variable Rate Demand Notes [Member] | Significant Other Observable Inputs (Level 2) [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale securities	24,840	8,310
Fair Value, Measurements, Recurring [Member] | Municipal Variable Rate Demand Notes [Member] | Significant Unobservable Inputs (Level 3) [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale securities	'	'
Fair Value, Measurements, Recurring [Member] | Equity Securities - Technology Industry [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale securities	10,639	11,398
Fair Value, Measurements, Recurring [Member] | Equity Securities - Technology Industry [Member] | Quoted Prices in Active Market for Identical Assets (Level 1) [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale securities	10,639	11,398
Fair Value, Measurements, Recurring [Member] | Equity Securities - Technology Industry [Member] | Significant Unobservable Inputs (Level 3) [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale securities	'	'
Fair Value, Measurements, Recurring [Member] | Equity Securities - Other [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale securities	26,947	27,054
Fair Value, Measurements, Recurring [Member] | Equity Securities - Other [Member] | Quoted Prices in Active Market for Identical Assets (Level 1) [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale securities	26,947	27,054
Fair Value, Measurements, Recurring [Member] | Equity Securities - Other [Member] | Significant Unobservable Inputs (Level 3) [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale securities	'	'

Derivative_Instruments_and_Hed2

Derivative Instruments and Hedging Activities - Additional Information (Detail)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2014
		Forward Contracts [Member]	Forward Contracts [Member]
		USD ($)	EUR (€)
Derivative [Line Items]	'	'	'
Maximum contractual period for derivatives	'12 months	'	'
Derivative, notional amount	'	$28.50	€ 20.70
Derivative maturity year	'	'2014	'2014

Derivative_Instruments_and_Hed3

Derivative Instruments and Hedging Activities - Schedule of Fair Values of Hedging Instruments Recorded in Consolidated Balance Sheet (Detail) (Significant Other Observable Inputs (Level 2) [Member], Foreign Exchange Contracts [Member], USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Other Receivables [Member]	'	'
Derivatives Not Designated as Hedging Instruments (Level 2):	'	'
Derivatives asset, fair value	$1	$18
Accounts Payable [Member]	'	'
Derivatives Not Designated as Hedging Instruments (Level 2):	'	'
Derivatives liability, fair value	($8)	($15)

Derivative_Instruments_and_Hed4

Derivative Instruments and Hedging Activities - Schedule of Change in Fair Values of Derivative Instruments Recorded in Consolidated Statements of Income (Detail) (Foreign Exchange Contracts [Member], Other Income (Expense) [Member], USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Foreign Exchange Contracts [Member] | Other Income (Expense) [Member]	'	'
Derivatives Not Designated as Hedging Instruments:	'	'
Derivative instrument, gain or loss	($110)	($224)

Inventory_Components_of_Invent

Inventory - Components of Inventory (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Inventory Disclosure [Abstract]	'	'
Raw materials	$41,546	$44,093
Work in process	3,217	3,484
Finished goods	42,633	42,534
Total	$87,396	$90,111

Inventory_Additional_Informati

Inventory - Additional Information (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Inventory Disclosure [Abstract]	'	'
Raw materials reserves, total	$17	$16.90
Finished goods inventory reserves, total	$4.90	$6.10

Goodwill_and_Intangible_Assets2

Goodwill and Intangible Assets - Change in Carrying Value of Goodwill (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Goodwill And Intangible Assets Disclosure [Abstract]	'	'
Goodwill, Beginning balance	$3,492,000	'
Acquisitions	'	'
Impairment losses	0	0
Accumulated impairment losses	'	'
Goodwill, Ending balance	$3,492,000	'

Goodwill_and_Intangible_Assets3

Goodwill and Intangible Assets - Additional Information (Detail) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Goodwill And Intangible Assets Disclosure [Abstract]	'	'
Impairment losses	$0	$0
Amortization expense	$0.60	$0.60

Goodwill_and_Intangible_Assets4

Goodwill and Intangible Assets - Summary of Intangible Assets (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Goodwill [Line Items]	'	'
Gross Value	$15,979	$16,157
Accumulated Amortization	-6,119	-5,585
Net Value	9,860	10,572
Customer Relationships [Member]	'	'
Goodwill [Line Items]	'	'
Gross Value	6,963	6,996
Accumulated Amortization	-1,742	-1,555
Net Value	5,221	5,441
Developed Technology [Member]	'	'
Goodwill [Line Items]	'	'
Gross Value	6,392	6,537
Accumulated Amortization	-2,939	-2,692
Net Value	3,453	3,845
Intellectual Property [Member]	'	'
Goodwill [Line Items]	'	'
Gross Value	2,340	2,340
Accumulated Amortization	-1,269	-1,185
Net Value	1,071	1,155
Trade Names [Member]	'	'
Goodwill [Line Items]	'	'
Gross Value	270	270
Accumulated Amortization	-160	-145
Net Value	110	125
Other [Member]	'	'
Goodwill [Line Items]	'	'
Gross Value	14	14
Accumulated Amortization	-9	-8
Net Value	$5	$6

Goodwill_and_Intangible_Assets5

Goodwill and Intangible Assets - Estimated Future Amortization Expense Related to Intangible Assets (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Goodwill And Intangible Assets Disclosure [Abstract]	'	'
Reminder of 2014	$1,718	'
2015	2,168	'
2016	1,893	'
2017	1,290	'
2018	782	'
Thereafter	2,009	'
Net Value	$9,860	$10,572

Stockholders_Equity_Summary_of

Stockholders' Equity - Summary of Changes in Stockholders' Equity (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Equity [Abstract]	'	'
Beginning balance	$604,606	'
Net income	9,607	7,890
Dividend payments	-5,102	'
Dividends accrued for unvested restricted stock units	6	'
Net unrealized gains (losses) on available-for-sale securities (net of tax)	-921	-1,644
Foreign currency translation adjustment	252	323
Proceeds from stock option exercises	1,541	55
Purchase of treasury stock	-9,427	'
Income tax benefit from exercise of stock options	57	'
Stock-based compensation expense	2,057	2,232
Ending balance	$602,676	'

Stockholders_Equity_Additional

Stockholders' Equity - Additional Information (Detail) (USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	1-May-13
Equity [Abstract]	'	'	'
Maximum shares authorized for repurchase	40,000,000	'	'
Stock repurchased, shares	400,000	'	'
Shares repurchased, average price per share	$25.13	'	'
Additional shares authorized for purchase	'	'	3,100,000
Number of Options, exercised	78,000	'	'
Exercise price of stock options, lower range limit	$15.29	'	'
Exercise price of stock options, upper range limit	$23.46	'	'
Proceeds from stock option exercise	$1,541	$55	'

Stockholders_Equity_Cash_Divid

Stockholders' Equity - Cash Dividends (Detail) (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Equity [Abstract]	'	'
Record Date	6-Feb-14	'
Payment Date	20-Feb-14	'
Per Share Amount	$0.09	$0.09
Total Dividend Paid	$5,102	$5,586

Stockholders_Equity_Changes_in

Stockholders' Equity - Changes in Accumulated Other Comprehensive Income, Net of Tax by Component (Detail) (USD $)	3 Months Ended								3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2014	Mar. 31, 2013
			Unrealized Gains (Losses) on Available-for-Sale Securities [Member]	Unrealized Gains (Losses) on Available-for-Sale Securities [Member]	Defined Benefit Plan Adjustments [Member]	Defined Benefit Plan Adjustments [Member]	Defined Benefit Plan Adjustments [Member]	Defined Benefit Plan Adjustments [Member]	Foreign Currency Adjustments [Member]	Foreign Currency Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'	'	'	'	'	'	'
Beginning balance	$10,753	$11,268	$10,737	$10,108	($891)	($891)	($1,952)	($1,952)	$907	$3,112
Other comprehensive income (loss) before reclassifications	654	777	402	454	'	'	'	'	252	323
Amounts reclassified from accumulated other comprehensive income	-1,323	-2,098	-1,323	-2,098	'	'	'	'	'	'
Other Comprehensive Income (Loss), net of tax	-669	-1,321	-921	-1,644	'	'	'	'	252	323
Ending balance	$10,084	$9,947	$9,816	$8,464	($891)	($891)	($1,952)	($1,952)	$1,159	$3,435

Stockholders_Equity_Reclassifi

Stockholders' Equity - Reclassifications Out of Accumulated Other Comprehensive Income (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]	'	'
Net realized investment gain	$2,192	$3,645
Total reclassifications for the period, before tax	14,679	9,723
Tax (expense) benefit	-5,072	-1,833
Total reclassifications for the period, net of tax	9,607	7,890
Reclassification Out of Accumulated Other Comprehensive Income [Member]	'	'
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]	'	'
Total reclassifications for the period, before tax	2,170	3,440
Tax (expense) benefit	-847	-1,342
Total reclassifications for the period, net of tax	1,323	2,098
Unrealized Gains (Losses) on Available-for-Sale Securities [Member] | Reclassification Out of Accumulated Other Comprehensive Income [Member]	'	'
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]	'	'
Net realized investment gain	2,170	3,444
Impairment Expense [Member] | Reclassification Out of Accumulated Other Comprehensive Income [Member]	'	'
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]	'	'
Net realized investment gain	'	($4)

Stockholders_Equity_Other_Comp

Stockholders' Equity - Other Comprehensive Income (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Equity [Abstract]	'	'
Unrealized gains (losses) on available-for-sale securities, Before-Tax Amount	$659	$744
Reclassification adjustment for amounts included in net income, Before-Tax Amount	-2,170	-3,440
Foreign currency translation adjustment, Before-Tax Amount	252	323
Total Other Comprehensive Income (Loss), Before-Tax Amount	-1,259	-2,373
Unrealized gains (losses) on available-for-sale securities, Tax (Expense) Benefit	-257	-290
Reclassification adjustment for amounts included in net income, Tax (Expense) Benefit	847	1,342
Foreign currency translation adjustment, Tax (Expense) Benefit	'	'
Total Other Comprehensive Income (Loss), Tax (Expense) Benefit	590	1,052
Unrealized gains (losses) on available-for-sale securities, Net-of-Tax Amount	402	454
Reclassification adjustment for amounts included in net income, Net-of-Tax Amount	-1,323	-2,098
Foreign currency translation adjustment, Net-of-Tax Amount	252	323
Other Comprehensive Income (Loss), net of tax	($669)	($1,321)

Earnings_Per_Share_Summary_of_

Earnings Per Share - Summary of Calculation of Basic and Diluted Earnings Per Share (Detail) (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Numerator	'	'
Net income	$9,607	$7,890
Denominator	'	'
Weighted average number of shares - basic	56,751	61,847
Effect of dilutive securities	'	'
Stock options	602	162
Restricted stock and restricted stock units	15	21
Weighted average number of shares - diluted	57,368	62,030
Net income per share - basic	$0.17	$0.13
Net income per share - diluted	$0.17	$0.13

Earnings_Per_Share_Additional_

Earnings Per Share - Additional Information (Detail)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Earnings Per Share [Abstract]	'	'
Anti-dilutive options, Total	3.1	5.4

Segment_Information_Additional

Segment Information - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2014
	Product_Category
	Segment
Segment Reporting [Abstract]	'
Number of operating reportable segments	2
Number of product categories	3

Segment_Information_Sales_and_

Segment Information - Sales and Gross Profit of Reportable Segments (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Segment Reporting Information [Line Items]	'	'
Sales	$147,004	$143,013
Gross Profit	77,790	69,677
Carrier Networks [Member]	'	'
Segment Reporting Information [Line Items]	'	'
Sales	118,162	109,887
Gross Profit	61,353	51,591
Enterprise Networks [Member]	'	'
Segment Reporting Information [Line Items]	'	'
Sales	28,842	33,126
Gross Profit	$16,437	$18,086

Segment_Information_Sales_Info

Segment Information - Sales Information by Product Category (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Revenue from External Customer [Line Items]	'	'
Sales	$147,004	$143,013
Carrier Systems [Member]	'	'
Revenue from External Customer [Line Items]	'	'
Sales	99,553	92,804
Business Networking [Member]	'	'
Revenue from External Customer [Line Items]	'	'
Sales	37,919	38,076
Loop Access [Member]	'	'
Revenue from External Customer [Line Items]	'	'
Sales	$9,532	$12,133

Segment_Information_Subcategor

Segment Information - Subcategory Revenues (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Revenue from External Customer [Line Items]	'	'
Sales	$147,004	$143,013
Core Products [Member]	'	'
Revenue from External Customer [Line Items]	'	'
Sales	131,262	118,020
Legacy Products [Member]	'	'
Revenue from External Customer [Line Items]	'	'
Sales	15,742	24,993
Broadband Access (Included in Carrier Systems) [Member] | Core Products [Member]	'	'
Revenue from External Customer [Line Items]	'	'
Sales	81,527	72,234
Optical (Included in Carrier Systems) [Member] | Core Products [Member]	'	'
Revenue from External Customer [Line Items]	'	'
Sales	12,789	8,874
Internetworking (Included in Business Networking) [Member] | Core Products [Member]	'	'
Revenue from External Customer [Line Items]	'	'
Sales	36,946	36,912
HDSL (Does not Include T1) (Included in Loop Access) [Member] | Legacy Products [Member]	'	'
Revenue from External Customer [Line Items]	'	'
Sales	8,877	11,407
Other Products (Excluding HDSL) [Member] | Legacy Products [Member]	'	'
Revenue from External Customer [Line Items]	'	'
Sales	$6,865	$13,586

Liability_for_Warranty_Returns2

Liability for Warranty Returns - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Product Warranties Disclosures [Abstract]	'	'	'	'
Period of warranty for product defects	'90 days to ten years	'	'	'
Liability for warranty obligations	$7,392,000	$8,977,000	$8,792,000	$9,653,000
Settlement of an Outstanding warranty claim	$1,500,000	'	'	'

Liability_for_Warranty_Returns3

Liability for Warranty Returns - Summary of Warranty Expense and Write-Off Activity (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Product Warranties Disclosures [Abstract]	'	'
Balance at beginning of period	$8,977	$9,653
Plus: Amounts charged to cost and expenses	434	397
Less: Deductions	-2,019	-1,258
Balance at end of period	$7,392	$8,792

Related_Party_Transactions_Add

Related Party Transactions - Additional Information (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Related Party Transactions [Abstract]	'	'
Related party legal fees per month	$10	$10

Commitments_and_Contingencies_

Commitments and Contingencies - Additional Information (Detail) (USD $)	Mar. 31, 2014
In Millions, unless otherwise specified	EquityUnit
Schedule of Investments [Line Items]	'
Aggregate investment committed in private equity funds	$7.90
Number of private equity funds	2
Commitments towards private equity funds	7.7
Private Equity Funds [Member]	'
Schedule of Investments [Line Items]	'
Contribution to private equity funds	$8.40

Subsequent_Events_Additional_I

Subsequent Events - Additional Information (Detail) (USD $)	3 Months Ended		0 Months Ended
In Millions, except Per Share data, unless otherwise specified	Mar. 31, 2014	1-May-13	7-May-14	Apr. 15, 2014	15-May-14
			Subsequent Events [Member]	Subsequent Events [Member]	Subsequent Events [Member]
Subsequent Event [Line Items]	'	'	'	'	'
Dividend declaration date	15-Apr-14	'	'	'	'
Cash dividend per common share	'	'	'	$0.09	'
Dividend record date	6-Feb-14	'	'	1-May-14	'
Dividend payment date	20-Feb-14	'	'	15-May-14	'
Cash dividend	'	'	'	'	$5
Stock repurchased, shares	0.4	'	1.3	'	'
Shares repurchased, average price per share	$25.13	'	$22.63	'	'
Additional shares authorized for purchase	'	3.1	1.8	'	'