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New accounting pronouncement benefit plans (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Other components of net periodic benefit income | $ 1,705 | $ 1,448 | $ 3,410 | $ 2,896
Total other income | 23,242 | 20,699 | 50,145 | 39,654
Employee Benefits and Share-based Compensation | 7,630 | 6,206 | 14,659 | 12,674
Other Cost and Expense, Operating | 1,665 | 1,749 | 3,575 | 3,405
Total other expense | $ 52,534 | $ 49,554 | $ 106,842 | $ 98,464

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