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Retirement Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2015
Retirement Benefit Plans [Abstract] |
Defined Contribution Plan Matching Obligations | Matching obligations, in connection with the plans which are funded in cash and typically contributed to the plans in March of the following year, are as follows (in thousands):
|  | U.S. Defined Contribution |
Year ended December 31, |  |  |
2015 |  | $ | 8,445 |
2014 |  |  | 8,267 |
2013 |  |  | 8,115 |
Components of Net Periodic Benefit Cost for Defined Benefit Plan | The components of net periodic benefit cost for our defined benefit plan include the following (in thousands):
|  | December 31, |
Defined benefit retirement plan: |  | 2015 |  |  | 2014 |  |  | 2013 |
Service cost |  | $ | — |  |  | $ | 164 |  |  | $ | 180 |
Interest cost |  |  | 218 |  |  |  | 277 |  |  |  | 235 |
Amortization of prior service cost |  |  | — |  |  |  | — |  |  |  | 28 |
Actuarial net loss |  |  | 735 |  |  |  | 388 |  |  |  | 690 |
Settlement loss |  |  | 1,509 |  |  |  | — |  |  |  | — |
Net periodic benefit cost |  | $ | 2,462 |  |  | $ | 829 |  |  | $ | 1,133 |
Defined Benefit Pension Plan, Projected Benefit Obligation ("PBO"), Accumulated Benefit Obligation ("ABO") and Fair Value of Plan's Assets | For the defined benefit pension plan, the projected benefit obligation (“PBO”), accumulated benefit obligation (“ABO”) and fair value of the plan’s assets are as follows (in thousands):
|  | December 31, |
|  | 2015 |  |  | 2014 |
Projected benefit obligation |  | $ | — |  |  | $ | 6,538 |
Accumulated benefit obligation |  |  | — |  |  |  | 6,538 |
Fair value of plan assets |  |  | — |  |  |  | — |
SERP Defined Benefit Plan [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Funded (Unfunded) Status | The benefit obligation, funded status, and amounts recognized in the consolidated financial statements for the SERP, as of and for the years ended December 31, 2015 and 2014, were (in thousands):
|  | Defined Benefit Retirement Plan |
|  | 2015 |  |  | 2014 |
Change in benefit obligation: |  |  |  |  |  |
Benefit obligation at beginning of year |  | $ | 6,538 |  |  | $ | 5,661 |
Service cost |  |  | — |  |  |  | 164 |
Interest cost |  |  | 218 |  |  |  | 277 |
Actuarial loss |  |  | 854 |  |  |  | 436 |
Benefits paid |  |  | (7,610 | ) |  |  | — |
Benefit obligation at end of year |  | $ | — |  |  | $ | 6,538 |
Unfunded status of the plan |  | $ | — |  |  | $ | (6,538 | )
Amounts recognized in the balance sheet: |  |  |  |  |  |  |  |
Accrued postretirement benefit liabilities |  | $ | — |  |  | $ | 6,538 |
Accumulated other comprehensive loss (pre-tax) related to: |  |  |  |  |  |  |  |
Unrecognized net actuarial losses |  |  | — |  |  |  | 1,389 |
Unrecognized prior service cost |  |  | — |  |  |  | — |
Amounts Recognized in Balance Sheet | Actuarial assumptions used to determine costs and benefit obligations related to our defined benefit plan are as follows:
|  | Settlement Date |  |  | December 31, |
|  | 2015 |  |  | 2014 |  |  | 2013 |
Discount rates |  |  | 2.88 | % |  |  | 4.00 | % |  |  | 4.90 | %
Salary increase |  |  | N/A |  |  |  | N/A |  |  |  | 4.00 | %
Actuarial Assumptions Used to Determine Costs and Benefit Obligations | Actuarial assumptions used to determine costs and benefit obligations related to our defined benefit plan are as follows:
|  | Settlement Date |  |  | December 31, |
|  | 2015 |  |  | 2014 |  |  | 2013 |
Discount rates |  |  | 2.88 | % |  |  | 4.00 | % |  |  | 4.90 | %
Salary increase |  |  | N/A |  |  |  | N/A |  |  |  | 4.00 | %

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- Definition Tabular disclosure of defined contribution plan matching obligations in connections with the plans which are funded in cash. + References No definition available. + Details
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- Definition Tabular disclosure of the amounts that are recognized in the balance sheet (or statement of financial position) for pension plans and/or other employee benefit plans, showing separately the assets and current and noncurrent liabilities (if applicable) recognized. + 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 (c) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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