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Stock-Based Compensation - Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Number of Options (in 000's) |  |  |  |
Outstanding at beginning of the year (in shares) |  | 648 | 650 | 924
Granted (in shares) |  | 243 | 77 | 133
Exercised (in shares) |  | (239) | (71) | (391)
Forfeited/canceled/expired (in shares) |  | 0 | (8) | (16)
Outstanding at end of the year (in shares) |  | 652 | 648 | 650
Vested and expected to vest at the end of the year (in shares) |  | 652 | 648 | 649
Exercisable at the end of the year (in shares) |  | 363 | 493 | 421
Weighted-Average Exercise Price |  |  |  |
Outstanding at beginning of the year (in dollars per share) |  | $ 30.50 | $ 25.56 | $ 22.04
Granted (in dollars per share) |  | 49.67 | 64.81 | 35.28
Exercised (in dollars per share) |  | 26.09 | 23.97 | 20.76
Forfeited/canceled/expired (in dollars per share) |  | 0.00 | 20.64 | 20.77
Outstanding at end of the year (in dollars per share) |  | 39.27 | 30.50 | 25.56
Vested and expected to vest at the end of the year (in dollars per share) |  | 39.27 | 30.50 | 25.57
Exercisable at the end of the year (in dollars per share) |  | $ 30.21 | $ 25.03 | $ 23.84
Weighted-Average Remaining Contractual Term and Aggregate Intrinsic Value |  |  |  |
Outstanding at end of the year, term |  | 4 years 9 months 10 days | 4 years 10 months 5 days | 5 years 7 months 2 days
Vested and expected to vest at the end of the year, term |  | 4 years 9 months 10 days | 4 years 10 months 5 days | 5 years 6 months 28 days
Exercisable at the end of the year, term |  | 3 years 10 months 17 days | 4 years 6 months 3 days | 4 years 10 months 13 days
Exercised |  | $ 9,933 | $ 2,193 | $ 10,651
Outstanding at end of the year | [1] | 16,553 | 14,556 | 25,653
Vested and expected to vest at the end of the year | [1] | 16,548 | 14,551 | 25,618
Exercisable at the end of the year | [1] | $ 12,511 | $ 12,979 | $ 17,345
[1] | The aggregate intrinsic value represents the total pre-tax value (the difference between our closing stock price on the last trading day of 2016, 2015, and 2014 and the exercise price, multiplied by the number of in-the-money options) that would have been received by the option holders had they all exercised their options on December 31, 2016, 2015, and 2014. This amount will change based on the fair market value of our stock.

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- 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 + Details
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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 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + 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 + 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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- Definition The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date. + 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 (e)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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