Supplemental Cash Flow Information (Supplemental Cash Flow Disclosures) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Supplemental Cash Flow Elements [Abstract]
Interest Paid, Excluding Capitalized Interest, Operating Activities			$ 34,475	$ 29,853
Income Taxes Paid			590	0
Change in capital expenditure payables and accruals			28,428	35,543
Divestiture date fair value of contingent consideration arrangement	$ 0	$ (7,880)	0	(7,880)
Share-based Compensation, Capitalized Amount	$ 1,514	$ 3,708	3,417	4,416
Costs Incurred, Asset Retirement Obligation Incurred			3,324	691
Non Cash Gain Loss On Extinguishment Of Debt			$ 0	$ 2,666

Change in accrued capital expenditures and capital expenditures in accounts payable

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- Definition

The fair value of the contingent consideration on the date of the divestiture

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- Definition

The non-cash portion of (gain) loss on the early extinguishment of debt.

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- Definition

Amount of asset retirement obligations (ARO) costs incurred (whether capitalized or charged to expense) during the period.

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- Definition

Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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- Definition

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

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Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.

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