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Share-Based Transactions - Summary of Activity Related to Stock Options Outstanding and Exercisable (Details) - $ / shares shares in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Number of shares, outstanding beginning balance | 107 | 145 | 203 |
Number of shares, granted |  |  | 90 |
Number of shares, exercised | (33) | (38) | (148) |
Number of shares, outstanding ending balance | 74 | 107 | 145 |
Weighted average exercise price, outstanding beginning balance | $ 45.15 | $ 44.75 | $ 41.28 |
Weighted average exercise price, granted |  |  | 41.88 |
Weighted average exercise price, exercised | 47.59 | 43.63 | 38.24 |
Weighted average exercise price, outstanding ending balance | $ 44.07 | $ 45.15 | $ 44.75 |
Number of shares, exercisable | 44 | 32 | 6 | 35
Weighted average exercise price, exercisable | $ 45.55 | $ 47.26 | $ 53.50 | $ 36.38
$41.20 (average term remaining - 5.1 years) [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Number of shares, vested option exercise prices outstanding | 7 |  |  |
Weighted average exercise price, vested option exercise prices outstanding | $ 41.20 |  |  |
Number of shares, vested option exercise prices exercisable | 7 |  |  |
Weighted average exercise price, vested option exercise prices exercisable | $ 41.20 |  |  |
$53.50 (average term remaining - 6.2 years) [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Number of shares, vested option exercise prices outstanding | 14 |  |  |
Weighted average exercise price, vested option exercise prices outstanding | $ 53.50 |  |  |
Number of shares, vested option exercise prices exercisable | 14 |  |  |
Weighted average exercise price, vested option exercise prices exercisable | $ 53.50 |  |  |
$41.88 (average term remaining - 7.1 years) [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Number of shares, vested option exercise prices outstanding | 52 |  |  |
Weighted average exercise price, vested option exercise prices outstanding | $ 41.88 |  |  |
Number of shares, vested option exercise prices exercisable | 22 |  |  |
Weighted average exercise price, vested option exercise prices exercisable | $ 41.88 |  |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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