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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2015
Compensation And Retirement Disclosure [Abstract] |
Net Periodic Pension Cost | The net periodic pension cost included the following components (in thousands):
| Year Ended December 31, |
| 2015 |  |  | 2014 |  |  | 2013 |
Components of the net periodic pension cost: |  |  |  |  |  |  |  |  |  |  |
Interest cost | $ | 1,340 |  |  | $ | 1,589 |  |  | $ | 1,403 |
Expected return on plan assets |  | (1,844 | ) |  |  | (1,958 | ) |  |  | (1,595 | )
Amortization of actuarial losses |  | 875 |  |  |  | 374 |  |  |  | 668 |
Net periodic pension cost | $ | 371 |  |  | $ | 5 |  |  | $ | 476 |
Actuarial Assumptions used to Compute net Periodic Pension Cost and Funded Status for U.K. Plan | The actuarial assumptions used to compute the net periodic pension cost for the years ended December 31, 2015, 2014 and 2013, respectively, for the U.K. Plan were as follows:
| Year Ended December 31, |
| 2015 |  |  | 2014 |  |  | 2013 |
Weighted-average discount rate |  | 3.5 | % |  |  | 4.6 | % |  |  | 4.3 | %
Weighted-average long-term rate of return on plan assets |  | 5.6 | % |  |  | 5.9 | % |  |  | 5.7 | %
The actuarial assumptions used to compute the funded status of the U.K. Plan as of December 31, 2015 and 2014, respectively, were as follows:
| December 31, |
| 2015 |  |  | 2014 |
Weighted-average discount rate |  | 3.8 | % |  |  | 3.5 | %
Rate of inflation |  | 2.8 | % |  |  | 2.7 | %
Reconciliation of Benefit Obligations and Plan Assets of U.K. Plan | The following table provides a reconciliation of benefit obligations and plan assets of the U.K. Plan (in thousands):
| December 31, |
| 2015 |  |  | 2014 |
Change in benefit obligation: |  |  |  |  |  |  |
Projected benefit obligation at beginning of year | $ | 39,421 |  |  | $ | 35,193 |
Interest cost |  | 1,340 |  |  |  | 1,589 |
Actuarial (gains) losses |  | (2,083 | ) |  |  | 6,060 |
Benefits paid |  | (798 | ) |  |  | (1,006 | )
Foreign currency exchange rate changes |  | (1,966 | ) |  |  | (2,415 | )
Projected benefit obligation at end of year | $ | 35,914 |  |  | $ | 39,421 |
Accumulated benefit obligation at end of year | $ | 35,914 |  |  | $ | 39,421 |
Change in plan assets: |  |  |  |  |  |  |
Fair value of plan assets at beginning of year | $ | 33,610 |  |  | $ | 33,457 |
Actual return on plan assets |  | 342 |  |  |  | 2,234 |
Employer contributions |  | 955 |  |  |  | 1,000 |
Benefits paid |  | (798 | ) |  |  | (1,006 | )
Foreign currency exchange rate changes |  | (1,735 | ) |  |  | (2,075 | )
Fair value of plan assets at end of year | $ | 32,374 |  |  | $ | 33,610 |
Funded status at end of year | $ | (3,540 | ) |  | $ | (5,811 | )
Amounts included in accumulated other comprehensive loss not yet recognized in net periodic pension cost: |  |  |  |  |  |  |
Net actuarial loss | $ | (9,874 | ) |  | $ | (11,890 | )
Amounts expected to be amortized from accumulated other comprehensive loss into net periodic pension cost over the next fiscal year consists of: |  |  |  |  |  |  |
Net actuarial loss | $ | 794 |  |  | $ | 892 |
The funded status of the U.K. Plan is included in other long term liabilities in the accompanying consolidated balance sheets.
Expected Future Benefit Payments | The following table reflects the total expected benefit payments to plan participants and have been estimated based on the same assumptions used to measure the Company’s benefit obligations as of December 31, 2015 (in thousands):
| Amount |
2016 | $ | 941 |
2017 |  | 1,043 |
2018 |  | 868 |
2019 |  | 1,244 |
2020 |  | 1,428 |
2021-2025 |  | 8,135 |
Total | $ | 13,659 |
Summary of Fair Value of Plan Assets by Asset Category | The following table summarizes the fair values of Plan assets by asset category as of December 31, 2015 (in thousands):
Asset Category |  | Fair Value |  |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Other Unobservable Inputs (Level 3) |
Mutual Funds: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balanced (1) |  | $ | 15,611 |  |  | $ | — |  |  | $ | 15,611 |  |  | $ | — |
Growth (2) |  |  | 16,583 |  |  |  | — |  |  |  | 16,583 |  |  |  | — |
Cash |  |  | 180 |  |  |  | 180 |  |  |  | — |  |  |  | — |
Total |  | $ | 32,374 |  |  | $ | 180 |  |  | $ | 32,194 |  |  | $ | — |
(1) | This class comprises a diversified portfolio of global investments which seeks a balanced return between capital growth and fixed income and is allocated on a weighted average basis as follows: equities (52%), bonds (24%), other assets (9%) and cash (15%).
(2) | This class comprises a diversified portfolio of global investments which seeks long-term capital growth and is allocated on a weighted average basis as follows: equities (67%), bonds (12%), other assets (9%) and cash (12%).
The following table summarizes the fair values of Plan assets by asset category as of December 31, 2014 (in thousands):
Asset Category |  | Fair Value |  |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Other Unobservable Inputs (Level 3) |
Mutual Funds: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balanced (1) |  | $ | 16,287 |  |  | $ | — |  |  | $ | 16,287 |  |  | $ | — |
Growth (2) |  |  | 17,149 |  |  |  | — |  |  |  | 17,149 |  |  |  | — |
Cash |  |  | 174 |  |  |  | 174 |  |  |  | — |  |  |  | — |
Total |  | $ | 33,610 |  |  | $ | 174 |  |  | $ | 33,436 |  |  | $ | — |
(1) | This class comprises a diversified portfolio of global investments which seeks a balanced return between capital growth and fixed income and is allocated on a weighted average basis as follows: equities (54%), bonds (32%), other assets (5%) and cash (9%).
(2) | This class comprises a diversified portfolio of global investments which seeks long-term capital growth and is allocated on a weighted average basis as follows: equities (67%), other assets (15%), bonds (8%), and cash (10%).

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- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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