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Benefit Plans (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Qualified and Non-qualified Defined Benefit Plans [Abstract]   
Participants' vesting percentage in CSC Supplemental Benefit Plan (in hundredths)100.00%  
Change in benefit obligation [Roll Forward]   
Benefit obligation at beginning of year$ 301,716$ 248,618 
Service cost40,78640,86235,773
Interest cost14,35413,35911,876
Actuarial loss (gain)(21,366)11,474 
Benefits paid(10,820)(12,597) 
Benefit obligations relating to Madison Square Garden as a result of the MSG Plans Transfer(15,642)[1]0[1] 
Benefit obligation at end of year309,028301,716248,618
Change in Fair Value of Plan Assets [Roll Forward]   
Fair value of plan assets at beginning of year194,468152,909 
Actual return on plan assets, net3,9351,189 
Employer contributions50,10952,967 
Benefits paid(10,820)(12,597) 
Plan assets relating to Madison Square Garden as a result of the MSG Plans Transfer(9,580)[1]0[1] 
Fair value of plan assets at end of year228,112194,468152,909
Unfunded status at end of year(80,916)(107,248) 
Other pre-tax changes in plan assets and benefit obligations recognized in other comprehensive loss (income) [Abstract]   
Actuarial loss (gain)(19,186)13,947 
Recognized actuarial loss(5,831)(5,265) 
Recognized prior service cost0(26) 
Transfer of unrecognized actuarial loss to Madison Square Garden as a result of the MSG Plans Transfer(3,712)0 
Transfer of unrecognized prior service cost to Madison Square Garden as a result of the MSG Plans Transfer(155)0 
Total recognized in other comprehensive loss(28,884)8,656 
Pre-tax amounts recognized in accumulated other comprehensive loss (income) [Abstract]   
Actuarial loss44,73673,465 
Prior service cost0155 
Total recognized in other comprehensive loss44,73673,620 
Approximate amount in accumulated other comprehensive loss expected to be recognized as a component of net periodic benefit costs during the next fiscal year1,561  
Net funded status relating to defined benefit plans [Abstract]   
Cablevision Defined Benefit Plans(80,916)  
Less: Current portion2,031  
Long-term defined benefit plan obligations(78,885)(105,461) 
Components of net periodic benefit cost (credit) [Abstract]   
Service cost40,78640,86235,773
Acquisition - service cost001,471
Interest cost14,35413,35911,876
Expected return on plan assets, net(6,116)(3,707)(12,233)
Recognized prior service cost02626
Recognized actuarial loss5,8315,2650
Settlement loss0550
Net periodic benefit cost54,855[2]55,860[2]36,913[2]
Weighted-average assumptions used to determine net periodic benefit cost [Abstract]   
Discount rate (in hundredths)5.17%5.58%5.75%
Rate of increase in future compensation levels (in hundredths)3.50%4.50%4.50%
Expected rate of return on plan assets (qualified plans only) (in hundredths)4.38%4.00%7.91%
Discount rate methodology and sourceDetermined from Buck Consultant's Discount Rate ModelDetermined from Buck Consultant's Discount Rate ModelDetermined from Buck Consultant's Discount Rate Model
Weighted-average assumptions used to determine benefit obligations [Abstract]   
Discount rate (in hundredths)5.25%5.17% 
Rate of increase in future compensation levels (in hundredths)3.50%3.50% 
Discount rate methodology and sourceDetermined from Buck Consultant's Discount Rate ModelDetermined from Buck Consultant's Discount Rate Model 
Weighted average asset allocation of pension plan [Abstract]   
Fixed income securities (in hundredths)91.00%37.00%[3] 
Cash equivalents and other (in hundredths)9.00%[4]63.00%[3],[4] 
Total weighted average asset allocation (in hundredths)100.00%100.00%[3] 
Pension Plan Assets Disclosure [Line Items]   
Fair value of Pension Plan Trust assets234,689[5]194,160 
Plan assets of Madison Square Garden held in Pension Plan Trust and expected to be transferred in 20119,451  
Projected future benefit payments for qualified and non-qualified defined benefit plans [Abstract]   
201117,791  
201223,377  
201327,361  
201432,051  
201534,577  
2016-2020203,003  
Benefit payment obligation payable in next twelve months for Cablevision's Qualified and Non-Qualified Defined Benefit Plans2,031  
Expected Company contribution to Pension Plan in next fiscal year68,300  
Defined Contribution Benefit Plans [Line Items]   
Costs associated with defined contribution benefit plans23,39521,37718,898
Fixed Income Securities Corporate Debt [Member]
   
Pension Plan Assets Disclosure [Line Items]   
Fair value of Pension Plan Trust assets41,399[6]  
Fixed Income Securities Corporate Debt [Member] | Level I [Member]
   
Pension Plan Assets Disclosure [Line Items]   
Fair value of Pension Plan Trust assets0[6]  
Fixed Income Securities Corporate Debt [Member] | Level II [Member]
   
Pension Plan Assets Disclosure [Line Items]   
Fair value of Pension Plan Trust assets41,399[6]  
Fixed Income Securities Corporate Debt [Member] | Level III [Member]
   
Pension Plan Assets Disclosure [Line Items]   
Fair value of Pension Plan Trust assets0[6]  
Fixed Income Securities Government Debt [Member]
   
Pension Plan Assets Disclosure [Line Items]   
Fair value of Pension Plan Trust assets7,449  
Fixed Income Securities Government Debt [Member] | Level I [Member]
   
Pension Plan Assets Disclosure [Line Items]   
Fair value of Pension Plan Trust assets0  
Fixed Income Securities Government Debt [Member] | Level II [Member]
   
Pension Plan Assets Disclosure [Line Items]   
Fair value of Pension Plan Trust assets7,449  
Fixed Income Securities Government Debt [Member] | Level III [Member]
   
Pension Plan Assets Disclosure [Line Items]   
Fair value of Pension Plan Trust assets0  
Fixed Income Securities Treasury Securities [Member]
   
Pension Plan Assets Disclosure [Line Items]   
Fair value of Pension Plan Trust assets166,252  
Fixed Income Securities Treasury Securities [Member] | Level I [Member]
   
Pension Plan Assets Disclosure [Line Items]   
Fair value of Pension Plan Trust assets0  
Fixed Income Securities Treasury Securities [Member] | Level II [Member]
   
Pension Plan Assets Disclosure [Line Items]   
Fair value of Pension Plan Trust assets166,252  
Fixed Income Securities Treasury Securities [Member] | Level III [Member]
   
Pension Plan Assets Disclosure [Line Items]   
Fair value of Pension Plan Trust assets0  
Fixed Income Securities Other [Member]
   
Pension Plan Assets Disclosure [Line Items]   
Fair value of Pension Plan Trust assets318  
Fixed Income Securities Other [Member] | Level I [Member]
   
Pension Plan Assets Disclosure [Line Items]   
Fair value of Pension Plan Trust assets0  
Fixed Income Securities Other [Member] | Level II [Member]
   
Pension Plan Assets Disclosure [Line Items]   
Fair value of Pension Plan Trust assets318  
Fixed Income Securities Other [Member] | Level III [Member]
   
Pension Plan Assets Disclosure [Line Items]   
Fair value of Pension Plan Trust assets0  
Fixed Income Securities [Member]
   
Pension Plan Assets Disclosure [Line Items]   
Fair value of Pension Plan Trust assets 72,200[7] 
Fixed Income Securities [Member] | Level I [Member]
   
Pension Plan Assets Disclosure [Line Items]   
Fair value of Pension Plan Trust assets 72,200[7] 
Fixed Income Securities [Member] | Level II [Member]
   
Pension Plan Assets Disclosure [Line Items]   
Fair value of Pension Plan Trust assets 0[7] 
Fixed Income Securities [Member] | Level III [Member]
   
Pension Plan Assets Disclosure [Line Items]   
Fair value of Pension Plan Trust assets 0[7] 
Cash Equivalents [Member]
   
Pension Plan Assets Disclosure [Line Items]   
Fair value of Pension Plan Trust assets19,271[8]121,960[9] 
Cash Equivalents [Member] | Level I [Member]
   
Pension Plan Assets Disclosure [Line Items]   
Fair value of Pension Plan Trust assets19,271[8]121,960[9] 
Cash Equivalents [Member] | Level II [Member]
   
Pension Plan Assets Disclosure [Line Items]   
Fair value of Pension Plan Trust assets0[8]0[9] 
Cash Equivalents [Member] | Level III [Member]
   
Pension Plan Assets Disclosure [Line Items]   
Fair value of Pension Plan Trust assets0[8]0[9] 
Level I [Member]
   
Pension Plan Assets Disclosure [Line Items]   
Fair value of Pension Plan Trust assets19,271[5]194,160 
Level II [Member]
   
Pension Plan Assets Disclosure [Line Items]   
Fair value of Pension Plan Trust assets215,418[5]0 
Level III [Member]
   
Pension Plan Assets Disclosure [Line Items]   
Fair value of Pension Plan Trust assets0[5]0 
Newsday [Member]
   
Defined Contribution Benefit Plans [Line Items]   
Costs associated with defined contribution benefit plans  539
AMC Networks Inc. [Member]
   
Defined Contribution Benefit Plans [Line Items]   
Net periodic benefit cost reflected as a component of discontinued operations4,988  
Madison Square Garden and AMC Networks [Member]
   
Defined Contribution Benefit Plans [Line Items]   
Net periodic benefit cost reflected as a component of discontinued operations $ 9,965$ 6,037
[1]Represents amounts as calculated on January 1, 2010 which represented the date employees of Madison Square Garden ceased participation in the Pension Plan. Plan assets are expected to be transferred to a Madison Square Garden sponsored trust in 2011.
[2]The table includes net periodic benefit costs of approximately $4,988 for the year ended December 31, 2010 relating to AMC Networks and approximately $9,965 and $6,037 for the years ended December 31, 2009 and 2008, respectively, relating to Madison Square Garden and AMC Networks, that is reflected as a component of discontinued operations in the Company's consolidated financial statements.
[3]In 2009, the Pension Plan assets were included in the Cablevision Retirement Plan Master Trust ("Master Trust").
[4]This class represents investment in mutual funds that invest primarily in money market securities.
[5]Total amount includes plan assets to Madison Square Garden of $9,451 as a result of the MSG Plans Transfer expected to be transferred in 2011, and excludes net receivables relating to securities sales that were not settled as of December 31, 2010.
[6]This class represents bonds of U.S. and foreign issuers from diverse industries.
[7]Represents the Master Trust's investment in mutual funds that invest primarily in long-duration government and non-government securities.
[8]This class represents the Pension Plan Trust's investment in mutual funds that invest primarily in money market securities.
[9]Represents the Master Trust's investment in mutual funds that invest primarily in money market securities.