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Fair Value (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Summary of changes in fair value of marketable securities [Roll Forward] |  |
Balance, beginning of period | $ 26,280,000 | $ 23,172,000
Actual return on plan assets: [Abstract] |  |
Relating to assets still held at the reporting date | (1,597,000) | 1,249,000
Purchases and issuances | 3,025,000 | 2,798,000
Sales and settlements | (416,000) | (939,000)
Transfers into Level 3 | 0 | 0
Balance, End of period | 27,292,000 | 26,280,000
Fair Value on a Recurring Basis [Member] |  |
Financial assets (liabilities) [Abstract] |  |
Cash equivalents and current investments | 47,121,000 | 86,574,000
Forward contracts | 485,000 | 1,661,000
Insurance company contracts | 27,292,000 | 26,280,000
Total | 74,898,000 | 114,515,000
Restricted current investments | 14,400 | 11,800
Fair Value on a Recurring Basis [Member] | Level 1 [Member] |  |
Financial assets (liabilities) [Abstract] |  |
Cash equivalents and current investments | 47,121,000 | 86,574,000
Forward contracts | 0 | 0
Insurance company contracts | 0 | 0
Total | 47,121,000 | 86,574,000
Fair Value on a Recurring Basis [Member] | Level 2 [Member] |  |
Financial assets (liabilities) [Abstract] |  |
Cash equivalents and current investments | 0 | 0
Forward contracts | 485,000 | 1,661,000
Insurance company contracts | 0 | 0
Total | 485,000 | 1,661,000
Fair Value on a Recurring Basis [Member] | Level 3 [Member] |  |
Financial assets (liabilities) [Abstract] |  |
Cash equivalents and current investments | 0 | 0
Forward contracts | 0 | 0
Insurance company contracts | 27,292,000 | 26,280,000
Total | $ 27,292,000 | $ 26,280,000

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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- Definition Fair value portion of the amount that could be realized under a life insurance contract or contracts owned by the entity, commonly known as corporate-owned life insurance (COLI) or bank-owned life insurance (BOLI). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Surrender Value -URI http://asc.fasb.org/extlink&oid=6507153 + Details
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