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Employee Benefits (Detail) - Benefit Plans and Related Amounts Recorded in Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]        
Projected benefit obligation $ 38,115us-gaap_DefinedBenefitPlanBenefitObligation $ 34,585us-gaap_DefinedBenefitPlanBenefitObligation $ 31,605us-gaap_DefinedBenefitPlanBenefitObligation $ 21,160us-gaap_DefinedBenefitPlanBenefitObligation
Plan assets at fair value (13,220)us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets [1] (13,870)us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets [1] (8,885)us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets [1]  
Funded status – shortfall 24,895us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation [2] 20,715us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation [2] 22,720us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation [2]  
Amounts recorded in the Consolidated Balance Sheets for the plans:        
Other liabilities — accrued pension obligation 24,895us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet [2] 20,715us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet [2] 22,720us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet [2]  
Stockholders’ equity — deferred actuarial loss $ (6,028)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax [3] $ (1,811)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax [3] $ (1,578)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax [3]  
[1] The plan assets are held by third-party trustees and are invested in a diversified portfolio of equities, high quality government and corporate bonds, and other investments. The assets are primarily valued based on Level 1 and Level 2 inputs under the fair value hierarchy in FASB ASC Topic 820, with the majority of the invested assets considered to be of low-to-medium investment risk. The Company projects a future long-term rate of return on these plan assets of 2.7%, which it believes is reasonable based on the composition of the assets and both current and projected market conditions. For the year-ended December 31, 2014, the Company contributed $2.8 million to these plans, and benefits paid to participants were $1.4 million. In addition to the plan assets held with third-party trustees, the Company also maintains a reinsurance asset arrangement with a large international insurance company. The reinsurance asset is an asset of the Company whose purpose is to provide funding for benefit payments for one of the plans. At December 31, 2014, the reinsurance asset was carried on the Company’s Consolidated Balance Sheets at its cash surrender value of $8.5 million and is classified in Other Assets. The Company believes the cash surrender value approximates fair value and is equivalent to a Level 2 input under the FASB’s fair value framework in ASC Topic 820.
[2] The Funded status — shortfall represents the amount of the projected benefit obligation that the Company has not funded with a third-party trustee. This amount is a liability of the Company and is recorded in Other Liabilities on the Company’s Consolidated Balance Sheets.
[3] The deferred actuarial loss as of December 31, 2014 is recorded in Accumulated Other Comprehensive Income (“AOCI”) and will be reclassified out of AOCI and recognized as pension expense over approximately 14 years, subject to certain limitations set forth in FASB ASC Topic 715. The impact of this amortization on the periodic pension expense in 2015 is projected to be approximately $0.4 million. The actual amortization of deferred actuarial losses (gains) from AOCI to pension expense was less than $0.1 million in 2014 and 2013 and $(0.2) million in 2012.