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New accounting standards (Details 8) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Other accrued liabilities |  |  | $ 186,010,000 | $ 221,059,000 | $ 186,010,000 |  |
Deferred income taxes |  |  | 347,271,000 | 430,085,000 | 347,271,000 |  |
Other |  |  | 1,179,140,000 | 1,148,359,000 | 1,179,140,000 |  |
Retained earnings |  |  | 1,040,748,000 | 1,163,602,000 | 1,040,748,000 |  |
Net unrealized gain (loss) on investments used to satisfy obligations under nonqualified benefit plans |  |  |  | (3,600,000) | 9,300,000 | $ 3,400,000 |
Income tax expense (benefit), continuing operations, adjustment of deferred tax (asset) liability |  |  | (39,500,000) | (42,000) | 7,735,000 | 0 |
Accounting Standards Update 2014-09 |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
New accounting pronouncement or change in accounting principle, effect of adoption, quantification |  |  |  | $ 0 |  |  |
Other accrued liabilities |  |  |  |  |  |  | $ 186,913,000
Deferred income taxes |  |  |  |  |  |  | 346,939,000
Other |  |  |  |  |  |  | 1,179,539,000
Retained earnings |  |  |  |  |  |  | 1,039,778,000
Restatement Adjustment | Accounting Standards Update 2017-07 | Other Nonoperating Income (Expense) |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Net periodic benefit cost |  |  |  |  | 6,200,000 | 4,500,000 |
Net unrealized gain (loss) on investments used to satisfy obligations under nonqualified benefit plans |  |  |  |  | 10,800,000 | $ 4,700,000 |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Other accrued liabilities |  |  |  |  |  |  | 903,000
Deferred income taxes |  |  |  |  |  |  | (332,000)
Other |  |  |  |  |  |  | 399,000
Retained earnings |  |  |  |  |  |  | $ (970,000)
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Accounting Standards Update 2014-09 |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Other accrued liabilities |  |  | 186,010,000 |  | 186,010,000 |  |
Deferred income taxes |  |  | 347,271,000 |  | 347,271,000 |  |
Other |  |  | 1,179,140,000 |  | 1,179,140,000 |  |
Retained earnings |  |  | 1,040,748,000 |  | $ 1,040,748,000 |  |
Other comprehensive income (loss) |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Income tax expense (benefit), continuing operations, adjustment of deferred tax (asset) liability |  |  | $ 7,700,000 |  |  |  |
Other comprehensive income (loss) | Adjustments for New Accounting Principle, Early Adoption |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Income tax expense (benefit), continuing operations, adjustment of deferred tax (asset) liability |  | $ 7,900,000 |  |  |  |  |
Subsequent event [Member] | Maximum [Member] | Liability | Accounting Standards Update 2016-02 |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
New accounting pronouncement or change in accounting principle, effect of adoption, quantification | $ 125,000,000 |  |  |  |  |  |
Subsequent event [Member] | Minimum [Member] | Liability | Accounting Standards Update 2016-02 |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
New accounting pronouncement or change in accounting principle, effect of adoption, quantification | $ 105,000,000 |  |  |  |  |  |

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