Financial instruments, Fair Value (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Non-Derivatives [Abstract]
Restricted cash		$ 87,180		$ 87,180		$ 27,814
Derivatives [Abstract]
Deferred financing costs		32,880		32,880		10,439
Asset acquisition		10,520		10,520
Fair Value Adjustment and Currency Translation Adjustment [Abstract]
Derivative liability/Equity agreement - Fair value adjustment - (Gain) loss		(288)	$ 1,323	(713)	$ (294)
Collateral for interest rate swaps		12,500		12,500		0
Interest Rate Swap [Member]
Fair Value Adjustment and Currency Translation Adjustment [Abstract]
Fair value adjustment (gain)		(346)	0	(346)	0
Cross Currency Interest Rate Swap [Member]
Fair Value Adjustment and Currency Translation Adjustment [Abstract]
Fair value adjustment (gain)		(6,014)	$ 0	(6,014)	$ 0
Level 1 [Member] | Market Approach [Member] | Carrying Value [Member]
Non-Derivatives [Abstract]
Cash and cash equivalents		143,138		143,138		601,522
Restricted cash		87,180		87,180		27,814
Investment in equity securities		245		245		256
Level 1 [Member] | Market Approach [Member] | Fair Value [Member]
Non-Derivatives [Abstract]
Cash and cash equivalents		143,138		143,138		601,522
Restricted cash		87,180		87,180		27,814
Investment in equity securities		245		245		256
Level 2 [Member] | Market Approach [Member] | Carrying Value [Member]
Non-Derivatives [Abstract]
Long-term debt	[1]	3,563,734		3,563,734		1,250,000
Level 2 [Member] | Market Approach [Member] | Fair Value [Member]
Non-Derivatives [Abstract]
Long-term debt	[1]	3,626,972		3,626,972		1,327,488
Level 2 [Member] | Income Approach [Member] | Carrying Value [Member] | Cross Currency Interest Rate Swap [Member]
Derivatives [Abstract]
Cross currency interest rate swap asset	[2],[3]	2,135		2,135		0
Interest rate swap liability	[2],[3]	28,474		28,474		0
Level 2 [Member] | Income Approach [Member] | Fair Value [Member] | Cross Currency Interest Rate Swap [Member]
Derivatives [Abstract]
Cross currency interest rate swap asset	[2],[3]	2,135		2,135		0
Interest rate swap liability	[2],[3]	28,474		28,474		0
Level 3 [Member] | Market Approach [Member] | Carrying Value [Member]
Non-Derivatives [Abstract]
Investment in equity securities		1,849		1,849		1,000
Level 3 [Member] | Market Approach [Member] | Fair Value [Member]
Non-Derivatives [Abstract]
Investment in equity securities		1,849		1,849		1,000
Level 3 [Member] | Income Approach [Member] | Carrying Value [Member]
Derivatives [Abstract]
Derivative liability	[4],[5]	31,923		31,923		10,716
Equity agreement	[5],[6]	20,430		20,430		22,768
Level 3 [Member] | Income Approach [Member] | Fair Value [Member]
Derivatives [Abstract]
Derivative liability	[4],[5]	31,923		31,923		10,716
Equity agreement	[5],[6]	$ 20,430		$ 20,430		$ 22,768

[1] Long-term debt is recorded at amortized cost on the condensed consolidated balance sheets, and is presented in the above table gross of deferred financing costs of $32,880 and $10,439 as of June 30, 2021 and December 31, 2020, respectively.

[2] Cross currency interest rate swap asset is presented within Prepaid expenses and other current assets and interest rate swap liability is presented within Other current liabilities on the condensed consolidated balance sheets.

[3] The fair value of certain derivative instruments, including interest rate swaps, is estimated considering current interest rates, foreign exchange rates, closing quoted market prices and the creditworthiness of counterparties.

[4] Consideration due to the sellers in assets acquistions when certain contingent events occur. The liability associated with the derivative liabilities is recorded within Other long-term liabilities on the condensed consolidated balance sheets.

[5] The Company estimates fair value of the derivative liability and equity agreement using a discounted cash flows method with discount rates based on the average yield curve for bonds with similar credit ratings and matching terms to the discount periods as well as a probability of the contingent event occurring.

[6] To be paid at the earlier of agreed-upon date or the date on which the valid planning permission is received for the facility in development in Shannon, Ireland. The liability associated with the equity agreement is recorded within Other current liabilities on the condensed consolidated balance sheets.