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Stock Plans and Stock Based Compensation (Details 3)	12 Months Ended
	Dec. 31, 2016 $ / shares shares
13.00-20.00
Range of Exercise Prices, Lower Range (in USD per share)	$ 13.00
Range of Exercise Prices, Upper Range (in USD per share)	$ 20.00
Outstanding (in shares) | shares	626
Weighted Average Remaining Contractual Life (in years)	2 years 11 months 16 days
Weighted Average Exercise Price (in USD per share)	$ 16.47
Number Exercisable (in shares) | shares	626
Weighted Average Exercise Price (in USD per share)	$ 16.47
20.01-29.30
Range of Exercise Prices, Lower Range (in USD per share)	20.01
Range of Exercise Prices, Upper Range (in USD per share)	$ 29.30
Outstanding (in shares) | shares	2,985
Weighted Average Remaining Contractual Life (in years)	4 years 2 months 23 days
Weighted Average Exercise Price (in USD per share)	$ 22.03
Number Exercisable (in shares) | shares	2,985
Weighted Average Exercise Price (in USD per share)	$ 22.03
29.31-35.70
Range of Exercise Prices, Lower Range (in USD per share)	29.31
Range of Exercise Prices, Upper Range (in USD per share)	$ 35.70
Outstanding (in shares) | shares	1,295
Weighted Average Remaining Contractual Life (in years)	1 year 11 months 16 days
Weighted Average Exercise Price (in USD per share)	$ 30.96
Number Exercisable (in shares) | shares	1,295
Weighted Average Exercise Price (in USD per share)	$ 30.96
35.71-37.50
Range of Exercise Prices, Lower Range (in USD per share)	35.71
Range of Exercise Prices, Upper Range (in USD per share)	$ 37.50
Outstanding (in shares) | shares	99,466
Weighted Average Remaining Contractual Life (in years)	3 years 26 days
Weighted Average Exercise Price (in USD per share)	$ 37.12
Number Exercisable (in shares) | shares	71,706
Weighted Average Exercise Price (in USD per share)	$ 37.16
37.51-41.00
Range of Exercise Prices, Lower Range (in USD per share)	37.51
Range of Exercise Prices, Upper Range (in USD per share)	$ 41.00
Outstanding (in shares) | shares	41,003
Weighted Average Remaining Contractual Life (in years)	6 years 4 months 2 days
Weighted Average Exercise Price (in USD per share)	$ 40.60
Number Exercisable (in shares) | shares	9,755
Weighted Average Exercise Price (in USD per share)	$ 40.60
41.01-50.00
Range of Exercise Prices, Lower Range (in USD per share)	41.01
Range of Exercise Prices, Upper Range (in USD per share)	$ 50.00
Outstanding (in shares) | shares	126,295
Weighted Average Remaining Contractual Life (in years)	5 years 5 months 19 days
Weighted Average Exercise Price (in USD per share)	$ 45.71
Number Exercisable (in shares) | shares	68,679
Weighted Average Exercise Price (in USD per share)	$ 42.76
50.01-60.00
Range of Exercise Prices, Lower Range (in USD per share)	50.01
Range of Exercise Prices, Upper Range (in USD per share)	$ 60.00
Outstanding (in shares) | shares	46,900
Weighted Average Remaining Contractual Life (in years)	8 years 10 months 2 days
Weighted Average Exercise Price (in USD per share)	$ 56.29
Number Exercisable (in shares) | shares	0
Weighted Average Exercise Price (in USD per share)	$ 0.00
60.01-86.18
Range of Exercise Prices, Lower Range (in USD per share)	60.01
Range of Exercise Prices, Upper Range (in USD per share)	$ 86.18
Outstanding (in shares) | shares	19,946
Weighted Average Remaining Contractual Life (in years)	9 years 10 months 10 days
Weighted Average Exercise Price (in USD per share)	$ 77.00
Number Exercisable (in shares) | shares	0
Weighted Average Exercise Price (in USD per share)	$ 0.00
Options and SARs Outstanding
Outstanding (in shares) | shares	338,516
Weighted Average Remaining Contractual Life (in years)	5 years 6 months 22 days
Weighted Average Exercise Price (in USD per share)	$ 45.56
Number Exercisable (in shares) | shares	155,046
Weighted Average Exercise Price (in USD per share)	$ 39.43

X

- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Number of options outstanding, including both vested and non-vested options.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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