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Fair Value (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Fair Value on a Recurring Basis [Member] |  |
Financial Assets (Liabilities) [Abstract] |  |
Cash equivalents and current investments | $ 50,307 | $ 47,121
Other long term assets | 2,782 |
Forward contracts | 1,371 | 485
Life insurance contracts | 32,286 | 27,292
Financial assets (liabilities), net | 86,746 | 74,898
Restricted current investments | 10,900 | 14,400
Fair Value on a Recurring Basis [Member] | Level 1 [Member] |  |
Financial Assets (Liabilities) [Abstract] |  |
Cash equivalents and current investments | 50,307 | 47,121
Other long term assets | 2,782 |
Forward contracts | 0 | 0
Life insurance contracts | 0 | 0
Financial assets (liabilities), net | 53,089 | 47,121
Fair Value on a Recurring Basis [Member] | Level 2 [Member] |  |
Financial Assets (Liabilities) [Abstract] |  |
Cash equivalents and current investments | 0 | 0
Other long term assets | 0 |
Forward contracts | 1,371 | 485
Life insurance contracts | 0 | 0
Financial assets (liabilities), net | 1,371 | 485
Fair Value on a Recurring Basis [Member] | Level 3 [Member] |  |
Financial Assets (Liabilities) [Abstract] |  |
Cash equivalents and current investments | 0 | 0
Other long term assets | 0 |
Forward contracts | 0 | 0
Life insurance contracts | 32,286 | 27,292
Financial assets (liabilities), net | 32,286 | 27,292
Insurance Company Contracts [Member] |  |
Changes in Fair Value of Level 3 Marketable Securities [Roll Forward] |  |
Beginning balance | 27,292 | 26,280
Actual Return on Plan Assets [Abstract] |  |
Relating to assets still held at the reporting date | 2,196 | (1,597)
Purchases and issuances | 3,051 | 3,025
Sales and settlements | (252) | (416)
Transfers into Level 3 | 0 | 0
Ending balance | $ 32,287 | $ 27,292

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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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