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Balance Sheet Components Other Current Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Balance Sheet Related Disclosures [Abstract]
Accrued taxes other than income taxes	$ 49,206	$ 36,858
Income taxes payable	20,368	141
Employee paid time off accruals	21,813	20,992
Accrued interest	30,315	16,704
Current portion of pensions and other postretirement benefits	9,503	9,151
Operating Lease, Liability, Current	4,120	0
Finance Lease, Liability, Current	2,695	0
Utility energy commodity derivative liabilities	4,035	3,908
Other current liabilities	33,399	32,604
Other current liabilities	$ 175,454	$ 120,358

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Carrying value as of the balance sheet date of obligations incurred and payable for real and property taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Current liabilities attributable to energy marketing activities (trading activities). Current energy marketing (trading activities) are when entities engage in both financial and physical trading to increase profits, manage their commodity price risk and enhance system reliability. They may trade electricity, coal, natural gas and oil. These entities typically use a variety of financial instruments, including forward contracts, options and swaps.

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