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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2016
Equity [Abstract] |
Schedule of Stock Option Activity | Stock option activity for the year ended December 31, 2016 is presented below (in thousands, except per share data and contractual term):
|  |  |  |  |  | Weighted - |  |  | Weighted - |  |  |  |  |
|  |  |  |  |  | Average |  |  | Average |  |  |  |  |
|  |  |  |  |  | Exercise |  |  | Remaining |  |  | Aggregate |
|  | Number |  |  | Price Per |  |  | Contractual |  |  | Intrinsic |
|  | of Shares |  |  | Share |  |  | Term (in years) |  |  | Value |
Outstanding at December 31, 2015 |  |  | 2,171 |  |  | $ | 33.84 |  |  |  |  |  |  |  |  |
Granted |  |  | 83 |  |  |  | 35.61 |  |  |  |  |  |  |  |  |
Exercised |  |  | (496 | ) |  |  | 31.73 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (218 | ) |  |  | 35.68 |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2016 |  |  | 1,540 |  |  | $ | 34.35 |  |  |  | 6.44 |  |  | $ | 13,235 |
Exercisable at December 31, 2016 |  |  | 883 |  |  | $ | 33.53 |  |  |  | 5.22 |  |  | $ | 8,315 |
Vested and expected to vest at December 31, 2016 |  |  | 1,474 |  |  | $ | 34.32 |  |  |  | 6.36 |  |  | $ | 12,727 |
Schedule of Restricted Stock Unit Activity | RSU activity for the year ended December 31, 2016 is presented below (in thousands, except per share data):
|  |  |  |  |  | Weighted- |
|  |  |  |  |  | Average |
|  | Number of |  |  | Grant Date |
|  | Shares |  |  | Fair Value |
Unvested at December 31, 2015 |  |  | 504 |  |  | $ | 33.67 |
Granted |  |  | 259 |  |  |  | 37.87 |
Vested |  |  | (171 | ) |  |  | 34.05 |
Forfeited |  |  | (53 | ) |  |  | 34.32 |
Unvested at December 31, 2016 |  |  | 539 |  |  | $ | 35.50 |
Summary of Shares Purchased by Employees Under the Stock Purchase Plan | Shares purchased by employees under the Stock Purchase Plan are as follows (in thousands, except per share data):
| Shares |  |  | Purchase |
Purchase Period Ended | Purchased |  |  | Price |
February 29, 2016 |  | 28 |  |  | $ | 26.00 |
August 31, 2016 |  | 25 |  |  | $ | 27.04 |
February 28, 2015 |  | 25 |  |  | $ | 31.98 |
August 31, 2015 |  | 25 |  |  | $ | 26.87 |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of employee stock purchase plan activity. + 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 (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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