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Stock Plans - Stock Option Activity (Details) - Stock option Awards - $ / shares | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Number of Shares |  |  |
Outstanding at the beginning of the period (in shares) | 2,064,000 | 2,391,000 | 2,598,000
Granted (in shares) | 0 | 17,000 | 509,000
Exercised (in shares) | (194,000) | (192,000) | (561,000)
Expired or forfeited (in shares) | (294,000) | (152,000) | (155,000)
Outstanding at the end of the period (in shares) | 1,576,000 | 2,064,000 | 2,391,000
Weighted Average Exercise price |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 32.91 | $ 31.65 | $ 29.98
Granted (in dollars per share) |  | 30.22 | 33.05
Exercised (in dollars per share) | 12.18 | 12.95 | 23.88
Expired or forfeited (in dollars per share) | 34.44 | 38.15 | 36.22
Outstanding at the end of the period (in dollars per share) | $ 35.18 | $ 32.91 | $ 31.65

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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + 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)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + 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)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance 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)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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