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Financial Instruments Measured at Fair Value (Tables) | 12 Months Ended
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Dec. 31, 2016
Fair Value Disclosures [Abstract] |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] | The following table presents assets (liabilities) measured at fair value on a recurring basis at December 31, 2016:
|  | Balance Sheet Location |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Cash and cash equivalents |  | Other assets |  | $ | 2,660 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,660 |
Available-for-sale securities |  | Other assets |  | 37,915 |  |  | — |  |  | — |  |  | 37,915 |
Interest rate swaps |  | Other assets |  | — |  |  | 152 |  |  | — |  |  | 152 |
Foreign exchange contracts |  | Other current assets |  | — |  |  | 4,685 |  |  | — |  |  | 4,685 |
Foreign exchange contracts |  | Accrued expenses |  | — |  |  | (3,444 | ) |  | — |  |  | (3,444 | )
Contingent consideration |  | Accrued expenses |  | — |  |  | — |  |  | (4,027 | ) |  | (4,027 | )
|  |  |  | $ | 40,575 |  |  | $ | 1,393 |  |  | $ | (4,027 | ) |  | $ | 37,941 |
The following table presents assets (liabilities) measured at fair value on a recurring basis at December 31, 2015:
|  | Balance Sheet Location |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Cash and cash equivalents |  | Other assets |  | $ | 1,559 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,559 |
Available-for-sale securities |  | Other assets |  | 41,178 |  |  | — |  |  | — |  |  | 41,178 |
Interest rate swaps |  | Other assets |  | — |  |  | 711 |  |  | — |  |  | 711 |
Foreign exchange contracts |  | Other current assets |  | — |  |  | 2,625 |  |  | — |  |  | 2,625 |
Foreign exchange contracts |  | Accrued expenses |  | — |  |  | (3,363 | ) |  | — |  |  | (3,363 | )
Contingent consideration |  | Accrued expenses |  | — |  |  | — |  |  | (3,889 | ) |  | (3,889 | )
|  |  |  | $ | 42,737 |  |  | $ | (27 | ) |  | $ | (3,889 | ) |  | $ | 38,821 |
Description of Types of Interest Rate Fair Value Hedging Instruments Used | The terms of our outstanding interest rate swap contracts at December 31, 2016 are as follows:
Maturity Date |  | Notional Amount |  | Interest rate due from counterparty |  | Interest rate due to counterparty
April 2020 |  | 50,000 |  | 6.000% |  | 6 mo. USD LIBOR + 3.896
June 2018 |  | 50,000 |  | 6.875% |  | 6 mo. USD LIBOR + 5.301
Available-for-sale Securities [Text Block] | The fair value of the company's available-for-sale securities is as follows at December 31:
| 2016 |  | 2015
| Marubun |  | Mutual Funds |  | Marubun |  | Mutual Funds
Cost basis | $ | 10,016 |  |  | $ | 18,097 |  |  | $ | 10,016 |  |  | $ | 17,389 |
Unrealized holding gain | 3,806 |  |  | 5,996 |  |  | 8,708 |  |  | 5,065 |
Fair value | $ | 13,822 |  |  | $ | 24,093 |  |  | $ | 18,724 |  |  | $ | 22,454 |
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance [Text Block] | The effect of derivative instruments on the company's consolidated statements of operations and other comprehensive income are as follows for the years ended December 31 are as follows:
|  | 2016 |  | 2015 |  | 2014
Gain (Loss) Recognized in Income |  |  |  |  |  |
Foreign exchange contracts |  | $ | 1,535 |  |  | $ | 4,755 |  |  | $ | (1,195 | )
Interest rate swaps |  | $ | (608 | ) |  | $ | (523 | ) |  | $ | (656 | )
Total |  | $ | 927 |  |  | $ | 4,232 |  |  | $ | (1,851 | )
Gain (Loss) Recognized in Other Comprehensive Income before reclassifications |  |  |  |  |  |
Foreign exchange contracts |  | $ | (153 | ) |  | $ | (1,001 | ) |  | $ | 412 |
Interest rate swaps |  | $ | — |  |  | $ | 827 |  |  | $ | — |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5618551-113959 + Details
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- Definition Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=56946850&loc=d3e41641-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=56946850&loc=d3e41678-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=56946850&loc=d3e41638-113959 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5580258-113959 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5579245-113959 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5579240-113959 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=56946850&loc=d3e41620-113959 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(n)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19190-110258 + Details
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