|
Employee Benefit Plans, other Post-Retirement Benefits (Details) (USD $)
|
12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
|
Dec. 31, 2011
|
Dec. 31, 2010
|
Dec. 31, 2009
|
||||||||
| Amounts included in the Consolidated Statement of Comprehensive Income | ||||||||||
| Total gains (losses) recognized in Comprehensive Income net of income tax benefit (expense) | $ (5,784,000) | $ (582,000) | $ 10,983,000 | |||||||
| Net periodic benefit cost assumptions | ||||||||||
| Discount rate assumptions | The discount rate for 2011 was determined using a hypothetical Aa spot yield curve represented by a series of annualized individual spot discount rates from six months to 99 years. The spot rate curve was derived from a direct calculation of the implied forward rate curve based on the included bond cash flows. The discount rate for 2010 was determined using a hypothetical Aa spot yield curve represented by a series of annualized individual discount rates from six months to thirty years. Each discount rate in the curve was derived by using a hypothetical zero coupon bond from an equal weighting of the bonds in distinct maturity groups. Only those bonds with yields to maturity in the top half of each maturity group were used to construct the yield curve. This yield curve, when populated with projected cash flows that represent the expected timing and amount of TDS plan benefit payments, produces a single effective interest discount rate that is used to measure the plan’s liabilities. The measurement date for actuarial determination was December 31, 2011. For measurement purposes, the annual rate of increase in the per capita cost of covered health care benefits was assumed for 2011 to be 7.9% for plan participants aged 65 and above, and 8.0% for participants under age 65. For all participants the 2011 annual rate of increase is expected to decrease to 5.0% by 2020. The 2010 expected rate of increase was 8.0% for plan participants aged 65 and above, and 7.5% for participants under age 65, decreasing to 5.0% for all participants by 2020. A 1% increase or decrease in assumed health care cost trend rates would have the following effects: | |||||||||
|
Level 1
|
||||||||||
| Change in plan assets | ||||||||||
| Fair value of plan assets at end of year | 41,256,000 | 44,992,000 | ||||||||
|
Level 3
|
||||||||||
| Change in plan assets | ||||||||||
| Fair value of plan assets at end of year | 11,000 | 31,000 | ||||||||
|
Bond Mutual Funds
|
||||||||||
| Change in plan assets | ||||||||||
| Fair value of plan assets at beginning of year | 11,552,000 | |||||||||
| Fair value of plan assets at end of year | 10,098,000 | |||||||||
| Benefit plan, investment and asset allocation | ||||||||||
| Investment strategy of mutual fund | The funds seek to achieve a maximum total return, consistent with preservation of capital and prudent investment management by investing in a wide spectrum of fixed income instruments including bonds, debt securities and other similar instruments issued by government and private-sector entities. | |||||||||
| Debt securities target asset allocation | 30.00% | |||||||||
| Debt securities actual asset allocation | 29.40% | 30.30% | ||||||||
|
Bond Mutual Funds | Level 1
|
||||||||||
| Change in plan assets | ||||||||||
| Fair value of plan assets at end of year | 10,098,000 | 11,552,000 | ||||||||
|
Money Market Mutual Funds
|
||||||||||
| Change in plan assets | ||||||||||
| Fair value of plan assets at beginning of year | 2,090,000 | |||||||||
| Fair value of plan assets at end of year | 2,031,000 | |||||||||
| Benefit plan, investment and asset allocation | ||||||||||
| Investment strategy of mutual fund | The fund seeks as high a level of current income as is consistent with the preservation of capital and the maintenance of liquidity by investing in a diversified portfolio of high-quality, dollar-denominated short-term debt securities. | |||||||||
|
Money Market Mutual Funds | Level 1
|
||||||||||
| Change in plan assets | ||||||||||
| Fair value of plan assets at end of year | 2,031,000 | 2,090,000 | ||||||||
|
Equity Mutual Funds | U.S. Small Cap
|
||||||||||
| Change in plan assets | ||||||||||
| Fair value of plan assets at beginning of year | 4,030,000 | |||||||||
| Fair value of plan assets at end of year | 3,723,000 | |||||||||
| Benefit plan, investment and asset allocation | ||||||||||
| Investment strategy of mutual fund | The fund seeks to track the performance of a benchmark index that measures the investment return of small-capitalization stocks. The fund attempts to replicate the index by investing substantially all of its assets in the stocks that make up the index in approximately the same proportion as the weighting in the index. | |||||||||
|
Equity Mutual Funds | U.S. Small Cap | Level 1
|
||||||||||
| Change in plan assets | ||||||||||
| Fair value of plan assets at end of year | 3,723,000 | 4,030,000 | ||||||||
|
Equity Mutual Funds | U.S. Large Cap
|
||||||||||
| Change in plan assets | ||||||||||
| Fair value of plan assets at beginning of year | 18,619,000 | |||||||||
| Fair value of plan assets at end of year | 18,100,000 | |||||||||
| Benefit plan, investment and asset allocation | ||||||||||
| Investment strategy of mutual fund | The funds seek to track the performance of several benchmark indices that measure the investment return of large-capitalization stocks. The funds attempt to replicate the indices by investing substantially all of their assets in the stocks that make up the various indices in approximately the same proportion as the weighting in the indices. | |||||||||
|
Equity Mutual Funds | U.S. Large Cap | Level 1
|
||||||||||
| Change in plan assets | ||||||||||
| Fair value of plan assets at end of year | 18,100,000 | 18,619,000 | ||||||||
|
Equity Mutual Funds | International
|
||||||||||
| Change in plan assets | ||||||||||
| Fair value of plan assets at beginning of year | 8,701,000 | |||||||||
| Fair value of plan assets at end of year | 7,304,000 | |||||||||
| Benefit plan, investment and asset allocation | ||||||||||
| Investment strategy of mutual fund | The funds seek to provide long-term capital appreciation by investing in the stocks of companies located outside the United States that are considered to have the potential for above-average capital appreciation. | |||||||||
| Equity securities target asset allocation | 20.00% | |||||||||
| Equity securities actual asset allocation | 17.70% | 19.40% | ||||||||
|
Equity Mutual Funds | International | Level 1
|
||||||||||
| Change in plan assets | ||||||||||
| Fair value of plan assets at end of year | 7,304,000 | 8,701,000 | ||||||||
|
Equity Mutual Funds | United States
|
||||||||||
| Benefit plan, investment and asset allocation | ||||||||||
| Equity securities target asset allocation | 50.00% | |||||||||
| Equity securities actual asset allocation | 52.90% | 50.30% | ||||||||
|
Other
|
||||||||||
| Change in plan assets | ||||||||||
| Fair value of plan assets at end of year | 11,000 | 31,000 | ||||||||
|
Other | Level 3
|
||||||||||
| Change in plan assets | ||||||||||
| Fair value of plan assets at end of year | 11,000 | 31,000 | ||||||||
|
Post Retirement Medical Benefits
|
||||||||||
| Amounts included in the Consolidated Balance Sheet, before tax | ||||||||||
| Net prior service costs | 26,173,000 | 29,988,000 | ||||||||
| Net actuarial loss | (39,117,000) | (31,426,000) | ||||||||
| Sum net prior service cost and net actuarial loss | (12,944,000) | (1,438,000) | ||||||||
| Amounts to be amortized to net benefit cost | ||||||||||
| Estimated net actuarial loss amortized from accumulated other comprehensive loss into net periodic benefit cost next year | 2,500,000 | |||||||||
| Estimated prior service cost gain amortized from accumulated other comprehensive loss into net periodic benefit cost next year | 3,700,000 | |||||||||
| Amounts included in the Consolidated Statement of Comprehensive Income | ||||||||||
| Net actuarial gains (losses) before income tax benefit (expense) | (9,625,000) | 1,180,000 | ||||||||
| Net actuarial gains (losses) deferred income tax benefit (expense) | 4,787,000 | 260,000 | ||||||||
| Net actuarial gains (losses) net of income tax benefit (expense) | (4,838,000) | 1,440,000 | ||||||||
| Amortization of prior service costs before income tax benefit (expense) | (3,815,000) | (3,815,000) | ||||||||
| Amortization of prior service costs deferred income tax (expense) benefit | 1,897,000 | (840,000) | ||||||||
| Amortization of prior service costs net of income tax benefit (expense) | (1,918,000) | (4,655,000) | ||||||||
| Amortization of actuarial losses before income tax benefit (expense) | 1,934,000 | 2,158,000 | ||||||||
| Amortization of actuarial losses deferred income tax benefit (expense) | (962,000) | 475,000 | ||||||||
| Amortization of actuarial losses net of income tax benefit (expense) | 972,000 | 2,633,000 | ||||||||
| Total gains (losses) recognized in Comprehensive Income before income tax benefit (expense) | (11,506,000) | (477,000) | ||||||||
| Total gains (losses) recognized in Comprehensive Income deferred tax benefit (expense) | (5,722,000) | 105,000 | ||||||||
| Total gains (losses) recognized in Comprehensive Income net of income tax benefit (expense) | (5,784,000) | (582,000) | ||||||||
| Change in benefit obligation | ||||||||||
| Benefit obligation at beginning of year | 44,270,000 | 42,698,000 | ||||||||
| Service cost | 1,116,000 | 1,175,000 | 2,140,000 | |||||||
| Interest cost | 2,368,000 | 2,325,000 | 3,616,000 | |||||||
| Actuarial (gain) loss | 5,158,000 | 748,000 | ||||||||
| Prescription drug subsidy | 263,000 | 238,000 | ||||||||
| Benefits paid | (3,062,000) | (2,914,000) | ||||||||
| Benefit obligation at end of year | 50,113,000 | 44,270,000 | 42,698,000 | |||||||
| Change in plan assets | ||||||||||
| Fair value of plan assets at beginning of year | 45,023,000 | 42,407,000 | ||||||||
| Actual return (loss) on plan assets | (971,000) | 5,323,000 | ||||||||
| Employer contribution | 277,000 | 207,000 | ||||||||
| Fair value of plan assets at end of year | 41,267,000 | 45,023,000 | 42,407,000 | |||||||
| Funded status | (8,846,000) | 753,000 | ||||||||
| Benefit plan, investment and asset allocation | ||||||||||
| Three year return | 12.45% | |||||||||
| Five year return | 2.12% | |||||||||
| Net periodic benefit cost | ||||||||||
| Service cost | 1,116,000 | 1,175,000 | 2,140,000 | |||||||
| Interest cost | 2,368,000 | 2,325,000 | 3,616,000 | |||||||
| Expected return on plan assets | (3,496,000) | (3,395,000) | (2,800,000) | |||||||
| Amortization of prior service cost | (3,815,000) | (3,815,000) | (801,000) | [1] | ||||||
| Amortization of unrecognized net loss | (1,934,000) | [2] | (2,158,000) | [2] | (1,806,000) | [2] | ||||
| Net post-retirement cost | (1,893,000) | (1,552,000) | 3,961,000 | |||||||
| Benefit obligations | ||||||||||
| Discount rate | 4.70% | 5.50% | ||||||||
| Net periodic benefit cost assumptions | ||||||||||
| Discount rate | 5.50% | 5.60% | ||||||||
| Expected return on plan assets | 8.00% | 8.25% | ||||||||
| Health care trend rates | ||||||||||
| Ultimate health care cost trend rate | 5.00% | 5.00% | ||||||||
| One percent increase effect on total service and interest cost components | 25,000 | |||||||||
| One percent decrease effect on total service and interest cost components | (24,000) | |||||||||
| One percent increase effect on post-retirement benefit obligation | 488,000 | |||||||||
| One percent decrease effect on post-retirement benefit obligation | (466,000) | |||||||||
| Estimated future post-retirement benefit payments | ||||||||||
| Estimated future post-retirement benefit payments - next twelve months | 2,455,000 | |||||||||
| Estimated future post-retirement benefit payments - 2 years | 2,445,000 | |||||||||
| Estimated future post-retirement benefit payments - 3 years | 2,441,000 | |||||||||
| Estimated future post-retirement benefit payments - 4 years | 2,374,000 | |||||||||
| Estimated future post-retirement benefit payments - 5 years | 2,398,000 | |||||||||
| Estimated future post-retirement benefit payments - 6-10 years | $ 16,096,000 | |||||||||
|
Post Retirement Medical Benefits | 65 and older
|
||||||||||
| Health care trend rates | ||||||||||
| Health care cost trend rate | 7.90% | |||||||||
| Ultimate health care cost trend rate | 8.00% | |||||||||
|
Post Retirement Medical Benefits | Under 65
|
||||||||||
| Health care trend rates | ||||||||||
| Health care cost trend rate | 8.00% | |||||||||
| Ultimate health care cost trend rate | 7.50% | |||||||||
|
||||||||||