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Long-term debt: (Details) € in Millions			1 Months Ended						3 Months Ended	12 Months Ended
Long-term debt: (Details) € in Millions	Dec. 01, 2021 USD ($)	Apr. 06, 2021 USD ($)	May 31, 2021 USD ($)	Mar. 31, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Aug. 31, 2018 USD ($)	Dec. 31, 2016 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2021 EUR (€)	Jul. 05, 2021 USD ($)	Dec. 31, 2020 EUR (€)	Jun. 30, 2020 EUR (€)	Dec. 31, 2019 EUR (€)	Jun. 30, 2019 EUR (€)	Feb. 28, 2015 USD ($)	Apr. 09, 2014 USD ($)
Long-term debt
Margin deposits										$ 20,000,000.0
Proceeds from Issuance of Secured Debt										496,933,000
Senior secured debt outstanding										897,796,000
Interest Payable, Current										5,046,000	$ 8,268,000
Unrealized foreign exchange gain (loss) on 2024 Euro Notes										32,522,000	(36,997,000)	$ 2,271,000
Restricted Cash
Long-term debt
Margin deposits										9,000,000.0
Unrestricted Cash
Long-term debt
Margin deposits										11,000,000.0
Interest Rate Swap
Long-term debt
Interest expense										9,000,000.0
Interest Rate Swap \| Cash
Long-term debt
Margin deposits										20,000,000.0
Senior secured 2026 Notes
Long-term debt
Face amount										$ 500,000,000.0				$ 500,000,000.0
Interest rate (as a percent)										3.50%			3.50%
Proceeds from Issuance of Secured Debt										$ 496,900,000
Discount on issuance of debt										1,800,000
Debt costs										$ 1,300,000
Redemption price percentage of principal amount redeemed										100.00%
Senior secured notes due 2022
Long-term debt
Face amount				$ 115,900,000						$ 284,100,000
Interest rate (as a percent)			5.375%
Senior secured debt outstanding			$ 284,100,000
Redemption of debt			$ 45,000,000.0
Redemption price percentage of principal amount redeemed										100.00%
Interest Payable, Current	$ 11,500,000			400,000
Gain (Loss) on Repurchase of Debt Instrument	$ 10,800,000			$ 3,900,000
Debt Instrument, Redemption Price, Percentage				103.20%
Principal amount deposited with trustee										$ 11,500,000
Redemption for debt, notice issued		$ 45,000,000.0
Redemption Value		$ 1,900,000
Redemption price per $1,000 aggregate principal amount		41.41533
Accrued Interest Value		$ 400,000
Accrued interest per $1,000 aggregate principal amount		9.70486
Extinguishment of Debt, Amount		$ 45,000,000.0
Long-term Debt, Gross		$ 284,100,000
Principal amount plus accrued and unpaid interest (as a percent)				103.20%
Senior secured notes due 2022 \| Interest Rate Swap
Long-term debt
Face amount										9,000,000.0
Net Liability, Prepaid expenses										1,600,000
Net liability, other long term										10,600,000
2021 Notes
Long-term debt
Face amount					$ 189,200,000				$ 189,200,000											$ 200,000,000.0
Interest rate (as a percent)																				5.625%
Interest expense									$ 10,900,000
Interest Payable, Current					$ 1,600,000
Long-term Debt, Gross										500,000,000.0
Senior unsecured 2024 Notes
Long-term debt
Face amount										$ 397,000,000.0			€ 350.0		€ 350.0	€ 215.0	€ 135.0	€ 135.0
Interest rate (as a percent)					4.375%					4.375%			4.375%			4.375%
Net proceeds					$ 240,300,000	$ 152,100,000
Debt fair value										$ 397,000,000.0	429,300,000	151,400,000
Debt costs											2,137,000	1,556,000
Gain (Loss) on Repurchase of Debt Instrument					$ 600,000
Debt Instrument, Redemption Price, Percentage										100.00%
Long-term Debt, Gross										$ 397,000,000.0			€ 350.0
Principal amount plus accrued and unpaid interest (as a percent)										100.00%
Unrealized foreign exchange gain (loss) on 2024 Euro Notes										$ (32,500,000)	$ 37,000,000.0	2,300,000
Senior unsecured 2024 Notes \| Prior to June 30, 2021
Long-term debt
Debt Instrument, Redemption Price, Percentage										104.375%
Premium percentage (as a percent)										35.00%
Principal amount plus accrued and unpaid interest (as a percent)										104.375%
Senior unsecured 2024 Notes \| After June 30, 2021
Long-term debt
Debt Instrument, Redemption Price, Percentage										102.188%
Principal amount plus accrued and unpaid interest (as a percent)										102.188%
Senior notes
Long-term debt
Face amount							$ 70,000,000.0	$ 125,000,000.0											$ 250,000,000.0
Interest rate (as a percent)																			5.375%
Debt costs												$ 1,317,000
Premium percentage (as a percent)							101.75%	100.375%
Senior notes \| Prior to December 1, 2021
Long-term debt
Debt Instrument, Redemption Price, Percentage										100.00%
Principal amount plus accrued and unpaid interest (as a percent)										100.00%