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Share-Based Compensation - Summary Nonvested Share Activity (Details) - $ / shares shares in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Weighted Average Grant Date Fair Value |  |  |
Beginning of period (in dollars per share) | $ 6.17 | $ 4.72 | $ 3.45
Granted (in dollars per share) | 30.30 | 8.24 | 6.81
Vested (in dollars per share) | 5.17 | 3.90 | 3.09
Forfeited (in dollars per share) | 6.70 | 6.05 | 4.77
End of period (in dollars per share) | $ 6.65 | $ 6.17 | $ 4.72
Number of Non-vested Shares |  |  |
Beginning of period (in shares) | 1,465 | 1,559 | 1,592
Granted (in shares) | 561 | 535 | 564
Vested (in shares) | (486) | (517) | (518)
Forfeited (in shares) | (79) | (112) | (79)
End of period (in shares) | 1,461 | 1,465 | 1,559

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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 The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of non-vested options outstanding. + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Number of non-vested options forfeited. + References No definition available. + Details
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- Definition Weighted average grant-date fair value of non-vested options forfeited. + References No definition available. + Details
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- Definition Weighted average grant-date fair value of non-vested options outstanding. + References No definition available. + Details
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- References No definition available. + Details
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- Definition Number of options vested. + References No definition available. + Details
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- Definition Weighted average grant-date fair value of options vested. + References No definition available. + Details
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