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Employee Benefit Plans - Stock unit activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Summary of stock unit activity |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number | 17,172,815 |  |
RSU Stock Settled [Member] |  |  |
Summary of stock unit activity |  |  |
Stock Units, Outstanding Beginning of year | 7,546,973 |  |
Stock Units, Granted | 2,045,503 |  |
Stock Units, Forfeited / Cancelled | (99,748) |  |
Stock Units, Issued | (3,269,682) |  |
Stock Units, Outstanding End of year | 6,223,046 | 7,546,973 |
Not Vested at End of Year | 4,185,141 |  |
Weighted-Average Grant-Date Fair Value, beginning of year | $ 43.41 |  |
Weighted-Average Grant-Date Fair Value, Granted | 67.77 |  |
Weighted-Average Grant-Date Fair Value, Forfeited / Cancelled | 62.93 |  |
Weighted-Average Grant-Date Fair Value, Issued | 34.32 |  |
Weighted-Average Grant-Date Fair Value, ending of year | 55.99 | $ 43.41 |
Weighted-Average Grant-Date Fair Value Not Vested, ending of year | $ 56.17 |  |
Total Fair Value, Issued | $ 225,000 | $ 154,000 | $ 159,000
Employee Benefit Plans Additional (Textual) [Abstract] |  |  |
Unrecognized compensation cost from stock options | $ 93,000 |  |
Weighted average period of recognition of unvested options, in months | 1 year 8 months 15 days |  |
Longest weighted-average period of recognition of unvested options, in months | 2 years 8 months 23 days |  |
Weighted-Average Grant-Date Fair Value, granted |  | $ 52.45 | $ 48.77
Total Fair Value, Issued | $ 225,000 | $ 154,000 | $ 159,000
RSU Cash Settled [Member] |  |  |
Summary of stock unit activity |  |  |
Stock Units, Outstanding Beginning of year | 376,608 |  |
Stock Units, Granted | 319,552 |  |
Stock Units, Forfeited / Cancelled | (6,914) |  |
Stock Units, Issued | (92,255) |  |
Stock Units, Outstanding End of year | 596,991 | 376,608 |
Not Vested at End of Year | 153,457 |  |
Weighted-Average Grant-Date Fair Value, beginning of year | $ 62.21 |  |
Weighted-Average Grant-Date Fair Value, Granted | 68.20 |  |
Weighted-Average Grant-Date Fair Value, Forfeited / Cancelled | 61.35 |  |
Weighted-Average Grant-Date Fair Value, Issued | 61.61 |  |
Weighted-Average Grant-Date Fair Value, ending of year | 64.54 | $ 62.21 |
Weighted-Average Grant-Date Fair Value Not Vested, ending of year | $ 64.54 |  |
Total Fair Value, Issued | $ 6,000 | $ 1,000 |
Employee Benefit Plans Additional (Textual) [Abstract] |  |  |
Unrecognized compensation cost from stock options | $ 5,000 |  |
Weighted average period of recognition of unvested options, in months | 1 year 8 months 12 days |  |
Longest weighted-average period of recognition of unvested options, in months | 2 years 1 month 13 days |  |
Weighted-Average Grant-Date Fair Value, granted |  | $ 53.68 |
Total Fair Value, Issued | $ 6,000 | $ 1,000 |

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- Definition Employee service share based compensation unrecognized compensation costs on nonvested award longest weighted average period of recognition. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award equity instrument other than options non vested weighted average grant date fair value. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award equity instruments other than options grants in period weighted average grant date fair value. + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, + References No definition available. + Details
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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + 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)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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